127038c3eSVladimir Zapolskiy // SPDX-License-Identifier: GPL-2.0+ 2f141ed65SGrant Likely /* 3f141ed65SGrant Likely * OF helpers for the GPIO API 4f141ed65SGrant Likely * 5f141ed65SGrant Likely * Copyright (c) 2007-2008 MontaVista Software, Inc. 6f141ed65SGrant Likely * 7f141ed65SGrant Likely * Author: Anton Vorontsov <avorontsov@ru.mvista.com> 8f141ed65SGrant Likely */ 9f141ed65SGrant Likely 10f141ed65SGrant Likely #include <linux/device.h> 11bea4dbeeSSachin Kamat #include <linux/err.h> 12f141ed65SGrant Likely #include <linux/errno.h> 13f141ed65SGrant Likely #include <linux/module.h> 14f141ed65SGrant Likely #include <linux/io.h> 15af8b6375SAlexandre Courbot #include <linux/gpio/consumer.h> 16f141ed65SGrant Likely #include <linux/of.h> 17f141ed65SGrant Likely #include <linux/of_address.h> 18f141ed65SGrant Likely #include <linux/of_gpio.h> 19f23f1516SShiraz Hashim #include <linux/pinctrl/pinctrl.h> 20f141ed65SGrant Likely #include <linux/slab.h> 21f625d460SBenoit Parrot #include <linux/gpio/machine.h> 22f141ed65SGrant Likely 231bd6b601SAlexandre Courbot #include "gpiolib.h" 24f626d6dfSLinus Walleij #include "gpiolib-of.h" 25f626d6dfSLinus Walleij 2671b8f600SLinus Walleij /** 2771b8f600SLinus Walleij * of_gpio_spi_cs_get_count() - special GPIO counting for SPI 28c5a66b97SLee Jones * @dev: Consuming device 29c5a66b97SLee Jones * @con_id: Function within the GPIO consumer 30c5a66b97SLee Jones * 3171b8f600SLinus Walleij * Some elder GPIO controllers need special quirks. Currently we handle 3247267732SLinus Walleij * the Freescale and PPC GPIO controller with bindings that doesn't use the 3371b8f600SLinus Walleij * established "cs-gpios" for chip selects but instead rely on 3471b8f600SLinus Walleij * "gpios" for the chip select lines. If we detect this, we redirect 3571b8f600SLinus Walleij * the counting of "cs-gpios" to count "gpios" transparent to the 3671b8f600SLinus Walleij * driver. 3771b8f600SLinus Walleij */ 38a1f4c96bSYueHaibing static int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id) 3971b8f600SLinus Walleij { 4071b8f600SLinus Walleij struct device_node *np = dev->of_node; 4171b8f600SLinus Walleij 4271b8f600SLinus Walleij if (!IS_ENABLED(CONFIG_SPI_MASTER)) 4371b8f600SLinus Walleij return 0; 4471b8f600SLinus Walleij if (!con_id || strcmp(con_id, "cs")) 4571b8f600SLinus Walleij return 0; 4671b8f600SLinus Walleij if (!of_device_is_compatible(np, "fsl,spi") && 4747267732SLinus Walleij !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && 4847267732SLinus Walleij !of_device_is_compatible(np, "ibm,ppc4xx-spi")) 4971b8f600SLinus Walleij return 0; 5071b8f600SLinus Walleij return of_gpio_named_count(np, "gpios"); 5171b8f600SLinus Walleij } 5271b8f600SLinus Walleij 53f626d6dfSLinus Walleij /* 54f626d6dfSLinus Walleij * This is used by external users of of_gpio_count() from <linux/of_gpio.h> 55f626d6dfSLinus Walleij * 56f626d6dfSLinus Walleij * FIXME: get rid of those external users by converting them to GPIO 57808b9931SGeert Uytterhoeven * descriptors and let them all use gpiod_count() 58f626d6dfSLinus Walleij */ 59f626d6dfSLinus Walleij int of_gpio_get_count(struct device *dev, const char *con_id) 60f626d6dfSLinus Walleij { 61f626d6dfSLinus Walleij int ret; 62f626d6dfSLinus Walleij char propname[32]; 63f626d6dfSLinus Walleij unsigned int i; 64f626d6dfSLinus Walleij 6571b8f600SLinus Walleij ret = of_gpio_spi_cs_get_count(dev, con_id); 6671b8f600SLinus Walleij if (ret > 0) 6771b8f600SLinus Walleij return ret; 6871b8f600SLinus Walleij 69f626d6dfSLinus Walleij for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { 70f626d6dfSLinus Walleij if (con_id) 71f626d6dfSLinus Walleij snprintf(propname, sizeof(propname), "%s-%s", 72f626d6dfSLinus Walleij con_id, gpio_suffixes[i]); 73f626d6dfSLinus Walleij else 74f626d6dfSLinus Walleij snprintf(propname, sizeof(propname), "%s", 75f626d6dfSLinus Walleij gpio_suffixes[i]); 76f626d6dfSLinus Walleij 77f626d6dfSLinus Walleij ret = of_gpio_named_count(dev->of_node, propname); 78f626d6dfSLinus Walleij if (ret > 0) 79f626d6dfSLinus Walleij break; 80f626d6dfSLinus Walleij } 81f626d6dfSLinus Walleij return ret ? ret : -ENOENT; 82f626d6dfSLinus Walleij } 83af8b6375SAlexandre Courbot 84c7e9d398SMasahiro Yamada static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) 853d0f7cf0SGrant Likely { 86c7e9d398SMasahiro Yamada struct of_phandle_args *gpiospec = data; 87c7e9d398SMasahiro Yamada 88d59fdbc7SAndy Shevchenko return device_match_of_node(&chip->gpiodev->dev, gpiospec->np) && 89d49b48f0SVincent Whitchurch chip->of_xlate && 90c7e9d398SMasahiro Yamada chip->of_xlate(chip, gpiospec, NULL) >= 0; 917b8792bbSHans Holmberg } 923d0f7cf0SGrant Likely 93c7e9d398SMasahiro Yamada static struct gpio_chip *of_find_gpiochip_by_xlate( 94c7e9d398SMasahiro Yamada struct of_phandle_args *gpiospec) 95762c2e46SMasahiro Yamada { 96c7e9d398SMasahiro Yamada return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate); 973d0f7cf0SGrant Likely } 983d0f7cf0SGrant Likely 9999468c1aSMasahiro Yamada static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, 10099468c1aSMasahiro Yamada struct of_phandle_args *gpiospec, 10199468c1aSMasahiro Yamada enum of_gpio_flags *flags) 10299468c1aSMasahiro Yamada { 10399468c1aSMasahiro Yamada int ret; 10499468c1aSMasahiro Yamada 10599468c1aSMasahiro Yamada if (chip->of_gpio_n_cells != gpiospec->args_count) 10699468c1aSMasahiro Yamada return ERR_PTR(-EINVAL); 10799468c1aSMasahiro Yamada 10899468c1aSMasahiro Yamada ret = chip->of_xlate(chip, gpiospec, flags); 10999468c1aSMasahiro Yamada if (ret < 0) 11099468c1aSMasahiro Yamada return ERR_PTR(ret); 11199468c1aSMasahiro Yamada 11299468c1aSMasahiro Yamada return gpiochip_get_desc(chip, ret); 113f141ed65SGrant Likely } 114f141ed65SGrant Likely 115f626d6dfSLinus Walleij /** 116f626d6dfSLinus Walleij * of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs 117f626d6dfSLinus Walleij * to set the .valid_mask 11814e8c535SRandy Dunlap * @gc: the target gpio_chip 11914e8c535SRandy Dunlap * 12014e8c535SRandy Dunlap * Return: true if the valid mask needs to be set 121f626d6dfSLinus Walleij */ 12249281a22SStephen Boyd bool of_gpio_need_valid_mask(const struct gpio_chip *gc) 123f626d6dfSLinus Walleij { 124f626d6dfSLinus Walleij int size; 1258990899dSKrzysztof Kozlowski const struct device_node *np = gc->of_node; 126f626d6dfSLinus Walleij 127f626d6dfSLinus Walleij size = of_property_count_u32_elems(np, "gpio-reserved-ranges"); 128f626d6dfSLinus Walleij if (size > 0 && size % 2 == 0) 129f626d6dfSLinus Walleij return true; 130f626d6dfSLinus Walleij return false; 131f626d6dfSLinus Walleij } 132f626d6dfSLinus Walleij 133e3186e36SDmitry Torokhov /* 134e3186e36SDmitry Torokhov * Overrides stated polarity of a gpio line and warns when there is a 135e3186e36SDmitry Torokhov * discrepancy. 136e3186e36SDmitry Torokhov */ 137e3186e36SDmitry Torokhov static void of_gpio_quirk_polarity(const struct device_node *np, 138e3186e36SDmitry Torokhov bool active_high, 139e3186e36SDmitry Torokhov enum of_gpio_flags *flags) 140e3186e36SDmitry Torokhov { 141e3186e36SDmitry Torokhov if (active_high) { 142e3186e36SDmitry Torokhov if (*flags & OF_GPIO_ACTIVE_LOW) { 143e3186e36SDmitry Torokhov pr_warn("%s GPIO handle specifies active low - ignored\n", 144e3186e36SDmitry Torokhov of_node_full_name(np)); 145e3186e36SDmitry Torokhov *flags &= ~OF_GPIO_ACTIVE_LOW; 146e3186e36SDmitry Torokhov } 147e3186e36SDmitry Torokhov } else { 148e3186e36SDmitry Torokhov if (!(*flags & OF_GPIO_ACTIVE_LOW)) 149e3186e36SDmitry Torokhov pr_info("%s enforce active low on GPIO handle\n", 150e3186e36SDmitry Torokhov of_node_full_name(np)); 151e3186e36SDmitry Torokhov *flags |= OF_GPIO_ACTIVE_LOW; 152e3186e36SDmitry Torokhov } 153e3186e36SDmitry Torokhov } 154e3186e36SDmitry Torokhov 15599d18d42SDmitry Torokhov /* 15699d18d42SDmitry Torokhov * This quirk does static polarity overrides in cases where existing 15799d18d42SDmitry Torokhov * DTS specified incorrect polarity. 15899d18d42SDmitry Torokhov */ 15999d18d42SDmitry Torokhov static void of_gpio_try_fixup_polarity(const struct device_node *np, 16099d18d42SDmitry Torokhov const char *propname, 16199d18d42SDmitry Torokhov enum of_gpio_flags *flags) 16299d18d42SDmitry Torokhov { 16399d18d42SDmitry Torokhov static const struct { 16499d18d42SDmitry Torokhov const char *compatible; 16599d18d42SDmitry Torokhov const char *propname; 16699d18d42SDmitry Torokhov bool active_high; 16799d18d42SDmitry Torokhov } gpios[] = { 16899d18d42SDmitry Torokhov #if !IS_ENABLED(CONFIG_LCD_HX8357) 16999d18d42SDmitry Torokhov /* 17099d18d42SDmitry Torokhov * Himax LCD controllers used incorrectly named 17199d18d42SDmitry Torokhov * "gpios-reset" property and also specified wrong 17299d18d42SDmitry Torokhov * polarity. 17399d18d42SDmitry Torokhov */ 17499d18d42SDmitry Torokhov { "himax,hx8357", "gpios-reset", false }, 17599d18d42SDmitry Torokhov { "himax,hx8369", "gpios-reset", false }, 17699d18d42SDmitry Torokhov #endif 17799d18d42SDmitry Torokhov }; 17899d18d42SDmitry Torokhov unsigned int i; 17999d18d42SDmitry Torokhov 18099d18d42SDmitry Torokhov for (i = 0; i < ARRAY_SIZE(gpios); i++) { 18199d18d42SDmitry Torokhov if (of_device_is_compatible(np, gpios[i].compatible) && 18299d18d42SDmitry Torokhov !strcmp(propname, gpios[i].propname)) { 18399d18d42SDmitry Torokhov of_gpio_quirk_polarity(np, gpios[i].active_high, flags); 18499d18d42SDmitry Torokhov break; 18599d18d42SDmitry Torokhov } 18699d18d42SDmitry Torokhov } 18799d18d42SDmitry Torokhov } 18899d18d42SDmitry Torokhov 189*34cb9352SDmitry Torokhov static void of_gpio_set_polarity_by_property(const struct device_node *np, 19089a5e15bSLinus Walleij const char *propname, 191*34cb9352SDmitry Torokhov enum of_gpio_flags *flags) 192a603a2b8SLinus Walleij { 193*34cb9352SDmitry Torokhov static const struct { 194*34cb9352SDmitry Torokhov const char *compatible; 195*34cb9352SDmitry Torokhov const char *gpio_propname; 196*34cb9352SDmitry Torokhov const char *polarity_propname; 197*34cb9352SDmitry Torokhov } gpios[] = { 198*34cb9352SDmitry Torokhov #if IS_ENABLED(CONFIG_FEC) 199*34cb9352SDmitry Torokhov /* Freescale Fast Ethernet Controller */ 200*34cb9352SDmitry Torokhov { "fsl,imx25-fec", "phy-reset-gpios", "phy-reset-active-high" }, 201*34cb9352SDmitry Torokhov { "fsl,imx27-fec", "phy-reset-gpios", "phy-reset-active-high" }, 202*34cb9352SDmitry Torokhov { "fsl,imx28-fec", "phy-reset-gpios", "phy-reset-active-high" }, 203*34cb9352SDmitry Torokhov { "fsl,imx6q-fec", "phy-reset-gpios", "phy-reset-active-high" }, 204*34cb9352SDmitry Torokhov { "fsl,mvf600-fec", "phy-reset-gpios", "phy-reset-active-high" }, 205*34cb9352SDmitry Torokhov { "fsl,imx6sx-fec", "phy-reset-gpios", "phy-reset-active-high" }, 206*34cb9352SDmitry Torokhov { "fsl,imx6ul-fec", "phy-reset-gpios", "phy-reset-active-high" }, 207*34cb9352SDmitry Torokhov { "fsl,imx8mq-fec", "phy-reset-gpios", "phy-reset-active-high" }, 208*34cb9352SDmitry Torokhov { "fsl,imx8qm-fec", "phy-reset-gpios", "phy-reset-active-high" }, 209*34cb9352SDmitry Torokhov { "fsl,s32v234-fec", "phy-reset-gpios", "phy-reset-active-high" }, 210*34cb9352SDmitry Torokhov #endif 21199d18d42SDmitry Torokhov 212a603a2b8SLinus Walleij /* 213a603a2b8SLinus Walleij * The regulator GPIO handles are specified such that the 214a603a2b8SLinus Walleij * presence or absence of "enable-active-high" solely controls 215a603a2b8SLinus Walleij * the polarity of the GPIO line. Any phandle flags must 216a603a2b8SLinus Walleij * be actively ignored. 217a603a2b8SLinus Walleij */ 218*34cb9352SDmitry Torokhov #if IS_ENABLED(CONFIG_REGULATOR_FIXED_VOLTAGE) 219*34cb9352SDmitry Torokhov { "regulator-fixed", "gpios", "enable-active-high" }, 220*34cb9352SDmitry Torokhov { "regulator-fixed", "gpio", "enable-active-high" }, 221*34cb9352SDmitry Torokhov { "reg-fixed-voltage", "gpios", "enable-active-high" }, 222*34cb9352SDmitry Torokhov { "reg-fixed-voltage", "gpio", "enable-active-high" }, 223*34cb9352SDmitry Torokhov #endif 224*34cb9352SDmitry Torokhov #if IS_ENABLED(CONFIG_REGULATOR_GPIO) 225*34cb9352SDmitry Torokhov { "regulator-gpio", "enable-gpio", "enable-active-high" }, 226*34cb9352SDmitry Torokhov { "regulator-gpio", "enable-gpios", "enable-active-high" }, 227*34cb9352SDmitry Torokhov #endif 228*34cb9352SDmitry Torokhov }; 229*34cb9352SDmitry Torokhov unsigned int i; 230*34cb9352SDmitry Torokhov bool active_high; 231*34cb9352SDmitry Torokhov 232*34cb9352SDmitry Torokhov for (i = 0; i < ARRAY_SIZE(gpios); i++) { 233*34cb9352SDmitry Torokhov if (of_device_is_compatible(np, gpios[i].compatible) && 234*34cb9352SDmitry Torokhov !strcmp(propname, gpios[i].gpio_propname)) { 235*34cb9352SDmitry Torokhov active_high = of_property_read_bool(np, 236*34cb9352SDmitry Torokhov gpios[i].polarity_propname); 237e3186e36SDmitry Torokhov of_gpio_quirk_polarity(np, active_high, flags); 238*34cb9352SDmitry Torokhov break; 239a603a2b8SLinus Walleij } 240*34cb9352SDmitry Torokhov } 241*34cb9352SDmitry Torokhov } 242*34cb9352SDmitry Torokhov 243*34cb9352SDmitry Torokhov static void of_gpio_flags_quirks(const struct device_node *np, 244*34cb9352SDmitry Torokhov const char *propname, 245*34cb9352SDmitry Torokhov enum of_gpio_flags *flags, 246*34cb9352SDmitry Torokhov int index) 247*34cb9352SDmitry Torokhov { 248*34cb9352SDmitry Torokhov of_gpio_try_fixup_polarity(np, propname, flags); 249*34cb9352SDmitry Torokhov of_gpio_set_polarity_by_property(np, propname, flags); 250*34cb9352SDmitry Torokhov 251a603a2b8SLinus Walleij /* 252a603a2b8SLinus Walleij * Legacy open drain handling for fixed voltage regulators. 253a603a2b8SLinus Walleij */ 254a603a2b8SLinus Walleij if (IS_ENABLED(CONFIG_REGULATOR) && 255a603a2b8SLinus Walleij of_device_is_compatible(np, "reg-fixed-voltage") && 256a603a2b8SLinus Walleij of_property_read_bool(np, "gpio-open-drain")) { 257a603a2b8SLinus Walleij *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); 258a603a2b8SLinus Walleij pr_info("%s uses legacy open drain flag - update the DTS if you can\n", 259a603a2b8SLinus Walleij of_node_full_name(np)); 260a603a2b8SLinus Walleij } 2616953c57aSLinus Walleij 2626953c57aSLinus Walleij /* 2636953c57aSLinus Walleij * Legacy handling of SPI active high chip select. If we have a 2646953c57aSLinus Walleij * property named "cs-gpios" we need to inspect the child node 2656953c57aSLinus Walleij * to determine if the flags should have inverted semantics. 2666953c57aSLinus Walleij */ 267da7f1349SLinus Walleij if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") && 268a71a81e7SGeert Uytterhoeven of_property_read_bool(np, "cs-gpios")) { 2696953c57aSLinus Walleij struct device_node *child; 2706953c57aSLinus Walleij u32 cs; 2716953c57aSLinus Walleij int ret; 2726953c57aSLinus Walleij 2736953c57aSLinus Walleij for_each_child_of_node(np, child) { 2746953c57aSLinus Walleij ret = of_property_read_u32(child, "reg", &cs); 275c1c04ceaSLinus Walleij if (ret) 2766953c57aSLinus Walleij continue; 2776953c57aSLinus Walleij if (cs == index) { 2786953c57aSLinus Walleij /* 2796953c57aSLinus Walleij * SPI children have active low chip selects 2806953c57aSLinus Walleij * by default. This can be specified negatively 2816953c57aSLinus Walleij * by just omitting "spi-cs-high" in the 2826953c57aSLinus Walleij * device node, or actively by tagging on 2836953c57aSLinus Walleij * GPIO_ACTIVE_LOW as flag in the device 2846953c57aSLinus Walleij * tree. If the line is simultaneously 2856953c57aSLinus Walleij * tagged as active low in the device tree 2866953c57aSLinus Walleij * and has the "spi-cs-high" set, we get a 2876953c57aSLinus Walleij * conflict and the "spi-cs-high" flag will 2886953c57aSLinus Walleij * take precedence. 2896953c57aSLinus Walleij */ 290e3186e36SDmitry Torokhov bool active_high = of_property_read_bool(child, 291e3186e36SDmitry Torokhov "spi-cs-high"); 292e3186e36SDmitry Torokhov of_gpio_quirk_polarity(child, active_high, 293e3186e36SDmitry Torokhov flags); 29489fea04cSNishka Dasgupta of_node_put(child); 2956953c57aSLinus Walleij break; 2966953c57aSLinus Walleij } 2976953c57aSLinus Walleij } 2986953c57aSLinus Walleij } 299edc1ef3fSMartin Blumenstingl 300edc1ef3fSMartin Blumenstingl /* Legacy handling of stmmac's active-low PHY reset line */ 301edc1ef3fSMartin Blumenstingl if (IS_ENABLED(CONFIG_STMMAC_ETH) && 302edc1ef3fSMartin Blumenstingl !strcmp(propname, "snps,reset-gpio") && 303edc1ef3fSMartin Blumenstingl of_property_read_bool(np, "snps,reset-active-low")) 304edc1ef3fSMartin Blumenstingl *flags |= OF_GPIO_ACTIVE_LOW; 305a603a2b8SLinus Walleij } 306a603a2b8SLinus Walleij 307f141ed65SGrant Likely /** 308af8b6375SAlexandre Courbot * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API 309f141ed65SGrant Likely * @np: device node to get GPIO from 310f141ed65SGrant Likely * @propname: property name containing gpio specifier(s) 311f141ed65SGrant Likely * @index: index of the GPIO 312f141ed65SGrant Likely * @flags: a flags pointer to fill in 313f141ed65SGrant Likely * 314af8b6375SAlexandre Courbot * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno 315f141ed65SGrant Likely * value on the error condition. If @flags is not NULL the function also fills 316f141ed65SGrant Likely * in flags for the GPIO. 317f141ed65SGrant Likely */ 318e6ae9a83SKrzysztof Kozlowski static struct gpio_desc *of_get_named_gpiod_flags(const struct device_node *np, 319af8b6375SAlexandre Courbot const char *propname, int index, enum of_gpio_flags *flags) 320f141ed65SGrant Likely { 321762c2e46SMasahiro Yamada struct of_phandle_args gpiospec; 322762c2e46SMasahiro Yamada struct gpio_chip *chip; 323762c2e46SMasahiro Yamada struct gpio_desc *desc; 324f141ed65SGrant Likely int ret; 325f141ed65SGrant Likely 326c11e6f0fSStephen Boyd ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, 327762c2e46SMasahiro Yamada &gpiospec); 3283d0f7cf0SGrant Likely if (ret) { 3297eb6ce2fSRob Herring pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", 3307eb6ce2fSRob Herring __func__, propname, np, index); 331af8b6375SAlexandre Courbot return ERR_PTR(ret); 3323d0f7cf0SGrant Likely } 333f141ed65SGrant Likely 334c7e9d398SMasahiro Yamada chip = of_find_gpiochip_by_xlate(&gpiospec); 335762c2e46SMasahiro Yamada if (!chip) { 336762c2e46SMasahiro Yamada desc = ERR_PTR(-EPROBE_DEFER); 337762c2e46SMasahiro Yamada goto out; 338762c2e46SMasahiro Yamada } 3393d0f7cf0SGrant Likely 34099468c1aSMasahiro Yamada desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); 341762c2e46SMasahiro Yamada if (IS_ERR(desc)) 342762c2e46SMasahiro Yamada goto out; 343762c2e46SMasahiro Yamada 344605f2d34SLinus Walleij if (flags) 34589a5e15bSLinus Walleij of_gpio_flags_quirks(np, propname, flags, index); 346a603a2b8SLinus Walleij 3477eb6ce2fSRob Herring pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", 3487eb6ce2fSRob Herring __func__, propname, np, index, 349762c2e46SMasahiro Yamada PTR_ERR_OR_ZERO(desc)); 350762c2e46SMasahiro Yamada 351762c2e46SMasahiro Yamada out: 352762c2e46SMasahiro Yamada of_node_put(gpiospec.np); 353762c2e46SMasahiro Yamada 354762c2e46SMasahiro Yamada return desc; 355f141ed65SGrant Likely } 356f141ed65SGrant Likely 357e6ae9a83SKrzysztof Kozlowski int of_get_named_gpio_flags(const struct device_node *np, const char *list_name, 358f01d9075SAlexandre Courbot int index, enum of_gpio_flags *flags) 359f01d9075SAlexandre Courbot { 360f01d9075SAlexandre Courbot struct gpio_desc *desc; 361f01d9075SAlexandre Courbot 362f01d9075SAlexandre Courbot desc = of_get_named_gpiod_flags(np, list_name, index, flags); 363f01d9075SAlexandre Courbot 364f01d9075SAlexandre Courbot if (IS_ERR(desc)) 365f01d9075SAlexandre Courbot return PTR_ERR(desc); 366f01d9075SAlexandre Courbot else 367f01d9075SAlexandre Courbot return desc_to_gpio(desc); 368f01d9075SAlexandre Courbot } 3696d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(of_get_named_gpio_flags); 370f01d9075SAlexandre Courbot 371d9e7f0e3SDmitry Torokhov /* Converts gpio_lookup_flags into bitmask of GPIO_* values */ 372d9e7f0e3SDmitry Torokhov static unsigned long of_convert_gpio_flags(enum of_gpio_flags flags) 373d9e7f0e3SDmitry Torokhov { 374d9e7f0e3SDmitry Torokhov unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 375d9e7f0e3SDmitry Torokhov 376d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_ACTIVE_LOW) 377d9e7f0e3SDmitry Torokhov lflags |= GPIO_ACTIVE_LOW; 378d9e7f0e3SDmitry Torokhov 379d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_SINGLE_ENDED) { 380d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_OPEN_DRAIN) 381d9e7f0e3SDmitry Torokhov lflags |= GPIO_OPEN_DRAIN; 382d9e7f0e3SDmitry Torokhov else 383d9e7f0e3SDmitry Torokhov lflags |= GPIO_OPEN_SOURCE; 384d9e7f0e3SDmitry Torokhov } 385d9e7f0e3SDmitry Torokhov 386d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_TRANSITORY) 387d9e7f0e3SDmitry Torokhov lflags |= GPIO_TRANSITORY; 388d9e7f0e3SDmitry Torokhov 389d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_PULL_UP) 390d9e7f0e3SDmitry Torokhov lflags |= GPIO_PULL_UP; 391d9e7f0e3SDmitry Torokhov 392d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_PULL_DOWN) 393d9e7f0e3SDmitry Torokhov lflags |= GPIO_PULL_DOWN; 394d9e7f0e3SDmitry Torokhov 395d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_PULL_DISABLE) 396d9e7f0e3SDmitry Torokhov lflags |= GPIO_PULL_DISABLE; 397d9e7f0e3SDmitry Torokhov 398d9e7f0e3SDmitry Torokhov return lflags; 399d9e7f0e3SDmitry Torokhov } 400d9e7f0e3SDmitry Torokhov 401f626d6dfSLinus Walleij /** 402f626d6dfSLinus Walleij * gpiod_get_from_of_node() - obtain a GPIO from an OF node 403f626d6dfSLinus Walleij * @node: handle of the OF node 404f626d6dfSLinus Walleij * @propname: name of the DT property representing the GPIO 405f626d6dfSLinus Walleij * @index: index of the GPIO to obtain for the consumer 406f626d6dfSLinus Walleij * @dflags: GPIO initialization flags 407f626d6dfSLinus Walleij * @label: label to attach to the requested GPIO 408f626d6dfSLinus Walleij * 409f626d6dfSLinus Walleij * Returns: 410f626d6dfSLinus Walleij * On successful request the GPIO pin is configured in accordance with 411f626d6dfSLinus Walleij * provided @dflags. 412f626d6dfSLinus Walleij * 413f626d6dfSLinus Walleij * In case of error an ERR_PTR() is returned. 414f626d6dfSLinus Walleij */ 415e6ae9a83SKrzysztof Kozlowski struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node, 416f626d6dfSLinus Walleij const char *propname, int index, 417f626d6dfSLinus Walleij enum gpiod_flags dflags, 418f626d6dfSLinus Walleij const char *label) 419f626d6dfSLinus Walleij { 420d9e7f0e3SDmitry Torokhov unsigned long lflags; 421f626d6dfSLinus Walleij struct gpio_desc *desc; 422d9e7f0e3SDmitry Torokhov enum of_gpio_flags of_flags; 423f626d6dfSLinus Walleij int ret; 424f626d6dfSLinus Walleij 425d9e7f0e3SDmitry Torokhov desc = of_get_named_gpiod_flags(node, propname, index, &of_flags); 426d9e7f0e3SDmitry Torokhov if (!desc || IS_ERR(desc)) 427f626d6dfSLinus Walleij return desc; 428f626d6dfSLinus Walleij 429f626d6dfSLinus Walleij ret = gpiod_request(desc, label); 430be7ae45cSMarco Felsch if (ret == -EBUSY && (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) 431f626d6dfSLinus Walleij return desc; 432f626d6dfSLinus Walleij if (ret) 433f626d6dfSLinus Walleij return ERR_PTR(ret); 434f626d6dfSLinus Walleij 435d9e7f0e3SDmitry Torokhov lflags = of_convert_gpio_flags(of_flags); 43631bea231SNuno Sá 437f626d6dfSLinus Walleij ret = gpiod_configure_flags(desc, propname, lflags, dflags); 438f626d6dfSLinus Walleij if (ret < 0) { 439f626d6dfSLinus Walleij gpiod_put(desc); 440f626d6dfSLinus Walleij return ERR_PTR(ret); 441f626d6dfSLinus Walleij } 442f626d6dfSLinus Walleij 443f626d6dfSLinus Walleij return desc; 444f626d6dfSLinus Walleij } 4456d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(gpiod_get_from_of_node); 446f141ed65SGrant Likely 447b311c5cbSDmitry Torokhov static struct gpio_desc *of_find_gpio_rename(struct device_node *np, 44898c3c940SDmitry Torokhov const char *con_id, 44998c3c940SDmitry Torokhov unsigned int idx, 450c8582339SLinus Walleij enum of_gpio_flags *of_flags) 451c8582339SLinus Walleij { 452b311c5cbSDmitry Torokhov static const struct of_rename_gpio { 453b311c5cbSDmitry Torokhov const char *con_id; 454b311c5cbSDmitry Torokhov const char *legacy_id; /* NULL - same as con_id */ 455b311c5cbSDmitry Torokhov /* 456b311c5cbSDmitry Torokhov * Compatible string can be set to NULL in case where 457b311c5cbSDmitry Torokhov * matching to a particular compatible is not practical, 458b311c5cbSDmitry Torokhov * but it should only be done for gpio names that have 459b311c5cbSDmitry Torokhov * vendor prefix to reduce risk of false positives. 460b311c5cbSDmitry Torokhov * Addition of such entries is strongly discouraged. 461b311c5cbSDmitry Torokhov */ 462b311c5cbSDmitry Torokhov const char *compatible; 463b311c5cbSDmitry Torokhov } gpios[] = { 464fbbbcd17SDmitry Torokhov #if !IS_ENABLED(CONFIG_LCD_HX8357) 465fbbbcd17SDmitry Torokhov /* Himax LCD controllers used "gpios-reset" */ 466fbbbcd17SDmitry Torokhov { "reset", "gpios-reset", "himax,hx8357" }, 467fbbbcd17SDmitry Torokhov { "reset", "gpios-reset", "himax,hx8369" }, 468fbbbcd17SDmitry Torokhov #endif 469b311c5cbSDmitry Torokhov #if IS_ENABLED(CONFIG_MFD_ARIZONA) 470b311c5cbSDmitry Torokhov { "wlf,reset", NULL, NULL }, 471b311c5cbSDmitry Torokhov #endif 472eaf1a296SDmitry Torokhov #if IS_ENABLED(CONFIG_RTC_DRV_MOXART) 473eaf1a296SDmitry Torokhov { "rtc-data", "gpio-rtc-data", "moxa,moxart-rtc" }, 474eaf1a296SDmitry Torokhov { "rtc-sclk", "gpio-rtc-sclk", "moxa,moxart-rtc" }, 475eaf1a296SDmitry Torokhov { "rtc-reset", "gpio-rtc-reset", "moxa,moxart-rtc" }, 476eaf1a296SDmitry Torokhov #endif 4779c2cc717SDmitry Torokhov #if IS_ENABLED(CONFIG_NFC_MRVL_I2C) 4789c2cc717SDmitry Torokhov { "reset", "reset-n-io", "marvell,nfc-i2c" }, 4799c2cc717SDmitry Torokhov #endif 4809c2cc717SDmitry Torokhov #if IS_ENABLED(CONFIG_NFC_MRVL_SPI) 4819c2cc717SDmitry Torokhov { "reset", "reset-n-io", "marvell,nfc-spi" }, 4829c2cc717SDmitry Torokhov #endif 4839c2cc717SDmitry Torokhov #if IS_ENABLED(CONFIG_NFC_MRVL_UART) 4849c2cc717SDmitry Torokhov { "reset", "reset-n-io", "marvell,nfc-uart" }, 4859c2cc717SDmitry Torokhov { "reset", "reset-n-io", "mrvl,nfc-uart" }, 4869c2cc717SDmitry Torokhov #endif 487fbbbcd17SDmitry Torokhov #if !IS_ENABLED(CONFIG_PCI_LANTIQ) 488fbbbcd17SDmitry Torokhov /* MIPS Lantiq PCI */ 489fbbbcd17SDmitry Torokhov { "reset", "gpios-reset", "lantiq,pci-xway" }, 490fbbbcd17SDmitry Torokhov #endif 491307c593bSDmitry Torokhov 492b311c5cbSDmitry Torokhov /* 493b311c5cbSDmitry Torokhov * Some regulator bindings happened before we managed to 494b311c5cbSDmitry Torokhov * establish that GPIO properties should be named 495b311c5cbSDmitry Torokhov * "foo-gpios" so we have this special kludge for them. 496b311c5cbSDmitry Torokhov */ 497307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1) 498b311c5cbSDmitry Torokhov { "wlf,ldoena", NULL, NULL }, /* Arizona */ 499307c593bSDmitry Torokhov #endif 500307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_REGULATOR_WM8994) 501b311c5cbSDmitry Torokhov { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */ 502b311c5cbSDmitry Torokhov { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */ 503b311c5cbSDmitry Torokhov #endif 504c8582339SLinus Walleij 505944004ebSDmitry Torokhov #if IS_ENABLED(CONFIG_SND_SOC_CS42L56) 506944004ebSDmitry Torokhov { "reset", "cirrus,gpio-nreset", "cirrus,cs42l56" }, 507944004ebSDmitry Torokhov #endif 508fbbbcd17SDmitry Torokhov #if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X) 509fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3x" }, 510fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic33" }, 511fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3007" }, 512fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3104" }, 513fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3106" }, 514fbbbcd17SDmitry Torokhov #endif 515307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_SPI_GPIO) 516c8582339SLinus Walleij /* 517b311c5cbSDmitry Torokhov * The SPI GPIO bindings happened before we managed to 518b311c5cbSDmitry Torokhov * establish that GPIO properties should be named 519b311c5cbSDmitry Torokhov * "foo-gpios" so we have this special kludge for them. 520c8582339SLinus Walleij */ 521b311c5cbSDmitry Torokhov { "miso", "gpio-miso", "spi-gpio" }, 522b311c5cbSDmitry Torokhov { "mosi", "gpio-mosi", "spi-gpio" }, 523b311c5cbSDmitry Torokhov { "sck", "gpio-sck", "spi-gpio" }, 524307c593bSDmitry Torokhov #endif 525c8582339SLinus Walleij 5266a537d48SLinus Walleij /* 527b311c5cbSDmitry Torokhov * The old Freescale bindings use simply "gpios" as name 528b311c5cbSDmitry Torokhov * for the chip select lines rather than "cs-gpios" like 529b311c5cbSDmitry Torokhov * all other SPI hardware. Allow this specifically for 530b311c5cbSDmitry Torokhov * Freescale and PPC devices. 531e3023bf8SLinus Walleij */ 532307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_SPI_FSL_SPI) 533b311c5cbSDmitry Torokhov { "cs", "gpios", "fsl,spi" }, 534b311c5cbSDmitry Torokhov { "cs", "gpios", "aeroflexgaisler,spictrl" }, 535307c593bSDmitry Torokhov #endif 536307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_SPI_PPC4xx) 537b311c5cbSDmitry Torokhov { "cs", "gpios", "ibm,ppc4xx-spi" }, 538b311c5cbSDmitry Torokhov #endif 539307c593bSDmitry Torokhov 540b311c5cbSDmitry Torokhov #if IS_ENABLED(CONFIG_TYPEC_FUSB302) 541e3023bf8SLinus Walleij /* 542b311c5cbSDmitry Torokhov * Fairchild FUSB302 host is using undocumented "fcs,int_n" 543b311c5cbSDmitry Torokhov * property without the compulsory "-gpios" suffix. 544e3023bf8SLinus Walleij */ 545b311c5cbSDmitry Torokhov { "fcs,int_n", NULL, "fcs,fusb302" }, 546b311c5cbSDmitry Torokhov #endif 5476a537d48SLinus Walleij }; 548b311c5cbSDmitry Torokhov struct gpio_desc *desc; 549b311c5cbSDmitry Torokhov const char *legacy_id; 550b311c5cbSDmitry Torokhov unsigned int i; 5516a537d48SLinus Walleij 5526a537d48SLinus Walleij if (!con_id) 5536a537d48SLinus Walleij return ERR_PTR(-ENOENT); 5546a537d48SLinus Walleij 555b311c5cbSDmitry Torokhov for (i = 0; i < ARRAY_SIZE(gpios); i++) { 556b311c5cbSDmitry Torokhov if (strcmp(con_id, gpios[i].con_id)) 557b311c5cbSDmitry Torokhov continue; 5586a537d48SLinus Walleij 559b311c5cbSDmitry Torokhov if (gpios[i].compatible && 560b311c5cbSDmitry Torokhov !of_device_is_compatible(np, gpios[i].compatible)) 561b311c5cbSDmitry Torokhov continue; 562b311c5cbSDmitry Torokhov 563b311c5cbSDmitry Torokhov legacy_id = gpios[i].legacy_id ?: gpios[i].con_id; 564b311c5cbSDmitry Torokhov desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags); 565b311c5cbSDmitry Torokhov if (!gpiod_not_found(desc)) { 566b311c5cbSDmitry Torokhov pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n", 567b311c5cbSDmitry Torokhov of_node_full_name(np), legacy_id, con_id); 568b311c5cbSDmitry Torokhov return desc; 569b311c5cbSDmitry Torokhov } 5706a537d48SLinus Walleij } 5716a537d48SLinus Walleij 57211c43bb0SDmitry Torokhov return ERR_PTR(-ENOENT); 5736e24826dSLinus Walleij } 5746e24826dSLinus Walleij 575326c3753SDmitry Torokhov static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np, 576326c3753SDmitry Torokhov const char *con_id, 577326c3753SDmitry Torokhov unsigned int idx, 578326c3753SDmitry Torokhov enum of_gpio_flags *of_flags) 579326c3753SDmitry Torokhov { 580326c3753SDmitry Torokhov struct gpio_desc *desc; 581326c3753SDmitry Torokhov const char *legacy_id; 582326c3753SDmitry Torokhov 583326c3753SDmitry Torokhov if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)) 584326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 585326c3753SDmitry Torokhov 586326c3753SDmitry Torokhov if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine")) 587326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 588326c3753SDmitry Torokhov 589326c3753SDmitry Torokhov if (!con_id || strcmp(con_id, "i2s1-in-sel")) 590326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 591326c3753SDmitry Torokhov 592326c3753SDmitry Torokhov if (idx == 0) 593326c3753SDmitry Torokhov legacy_id = "i2s1-in-sel-gpio1"; 594326c3753SDmitry Torokhov else if (idx == 1) 595326c3753SDmitry Torokhov legacy_id = "i2s1-in-sel-gpio2"; 596326c3753SDmitry Torokhov else 597326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 598326c3753SDmitry Torokhov 599326c3753SDmitry Torokhov desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags); 600326c3753SDmitry Torokhov if (!gpiod_not_found(desc)) 601326c3753SDmitry Torokhov pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n", 602326c3753SDmitry Torokhov of_node_full_name(np), legacy_id, con_id); 603326c3753SDmitry Torokhov 604326c3753SDmitry Torokhov return desc; 605326c3753SDmitry Torokhov } 606326c3753SDmitry Torokhov 607a2b5e207SDmitry Torokhov typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, 608a2b5e207SDmitry Torokhov const char *con_id, 609a2b5e207SDmitry Torokhov unsigned int idx, 610a2b5e207SDmitry Torokhov enum of_gpio_flags *of_flags); 611a2b5e207SDmitry Torokhov static const of_find_gpio_quirk of_find_gpio_quirks[] = { 612b311c5cbSDmitry Torokhov of_find_gpio_rename, 613326c3753SDmitry Torokhov of_find_mt2701_gpio, 6148b10ca2fSMichael Walle NULL 615a2b5e207SDmitry Torokhov }; 616a2b5e207SDmitry Torokhov 617ea713bc4SLinus Walleij struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, 618fed7026aSAndy Shevchenko unsigned int idx, unsigned long *flags) 619ea713bc4SLinus Walleij { 620ea713bc4SLinus Walleij char prop_name[32]; /* 32 is max size of property name */ 621ea713bc4SLinus Walleij enum of_gpio_flags of_flags; 622a2b5e207SDmitry Torokhov const of_find_gpio_quirk *q; 623ea713bc4SLinus Walleij struct gpio_desc *desc; 624ea713bc4SLinus Walleij unsigned int i; 625ea713bc4SLinus Walleij 626c8582339SLinus Walleij /* Try GPIO property "foo-gpios" and "foo-gpio" */ 627ea713bc4SLinus Walleij for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { 628ea713bc4SLinus Walleij if (con_id) 629ea713bc4SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, 630ea713bc4SLinus Walleij gpio_suffixes[i]); 631ea713bc4SLinus Walleij else 632ea713bc4SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s", 633ea713bc4SLinus Walleij gpio_suffixes[i]); 634ea713bc4SLinus Walleij 635ea713bc4SLinus Walleij desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, 636ea713bc4SLinus Walleij &of_flags); 6376662ae6aSMaxime Ripard 6387b58696dSAndy Shevchenko if (!gpiod_not_found(desc)) 639ea713bc4SLinus Walleij break; 640ea713bc4SLinus Walleij } 641ea713bc4SLinus Walleij 642a2b5e207SDmitry Torokhov /* Properly named GPIO was not found, try workarounds */ 643a2b5e207SDmitry Torokhov for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) 644a2b5e207SDmitry Torokhov desc = (*q)(dev->of_node, con_id, idx, &of_flags); 6456e24826dSLinus Walleij 646ea713bc4SLinus Walleij if (IS_ERR(desc)) 647ea713bc4SLinus Walleij return desc; 648ea713bc4SLinus Walleij 649d9e7f0e3SDmitry Torokhov *flags = of_convert_gpio_flags(of_flags); 650d449991cSThomas Petazzoni 651ea713bc4SLinus Walleij return desc; 652ea713bc4SLinus Walleij } 653ea713bc4SLinus Walleij 654f141ed65SGrant Likely /** 655fd7337fdSMarkus Pargmann * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API 656f625d460SBenoit Parrot * @np: device node to get GPIO from 657be715343SMasahiro Yamada * @chip: GPIO chip whose hog is parsed 658a79fead5SGeert Uytterhoeven * @idx: Index of the GPIO to parse 659f625d460SBenoit Parrot * @name: GPIO line name 660fed7026aSAndy Shevchenko * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from 661fed7026aSAndy Shevchenko * of_find_gpio() or of_parse_own_gpio() 662f625d460SBenoit Parrot * @dflags: gpiod_flags - optional GPIO initialization flags 663f625d460SBenoit Parrot * 664f625d460SBenoit Parrot * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno 665f625d460SBenoit Parrot * value on the error condition. 666f625d460SBenoit Parrot */ 667fd7337fdSMarkus Pargmann static struct gpio_desc *of_parse_own_gpio(struct device_node *np, 668be715343SMasahiro Yamada struct gpio_chip *chip, 669a79fead5SGeert Uytterhoeven unsigned int idx, const char **name, 670fed7026aSAndy Shevchenko unsigned long *lflags, 671f625d460SBenoit Parrot enum gpiod_flags *dflags) 672f625d460SBenoit Parrot { 673f625d460SBenoit Parrot struct device_node *chip_np; 674f625d460SBenoit Parrot enum of_gpio_flags xlate_flags; 675be715343SMasahiro Yamada struct of_phandle_args gpiospec; 676be715343SMasahiro Yamada struct gpio_desc *desc; 677a79fead5SGeert Uytterhoeven unsigned int i; 678f625d460SBenoit Parrot u32 tmp; 6793f9547e1SMasahiro Yamada int ret; 680f625d460SBenoit Parrot 681be715343SMasahiro Yamada chip_np = chip->of_node; 682f625d460SBenoit Parrot if (!chip_np) 683f625d460SBenoit Parrot return ERR_PTR(-EINVAL); 684f625d460SBenoit Parrot 685f625d460SBenoit Parrot xlate_flags = 0; 6862d6c06f5SAndy Shevchenko *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 68740941954SAndy Shevchenko *dflags = GPIOD_ASIS; 688f625d460SBenoit Parrot 689f625d460SBenoit Parrot ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); 690f625d460SBenoit Parrot if (ret) 691f625d460SBenoit Parrot return ERR_PTR(ret); 692f625d460SBenoit Parrot 693be715343SMasahiro Yamada gpiospec.np = chip_np; 694be715343SMasahiro Yamada gpiospec.args_count = tmp; 695f625d460SBenoit Parrot 696a79fead5SGeert Uytterhoeven for (i = 0; i < tmp; i++) { 697a79fead5SGeert Uytterhoeven ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, 698a79fead5SGeert Uytterhoeven &gpiospec.args[i]); 699f625d460SBenoit Parrot if (ret) 700f625d460SBenoit Parrot return ERR_PTR(ret); 701a79fead5SGeert Uytterhoeven } 702f625d460SBenoit Parrot 70399468c1aSMasahiro Yamada desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); 704be715343SMasahiro Yamada if (IS_ERR(desc)) 705be715343SMasahiro Yamada return desc; 706f625d460SBenoit Parrot 707d9e7f0e3SDmitry Torokhov *lflags = of_convert_gpio_flags(xlate_flags); 708f625d460SBenoit Parrot 709f625d460SBenoit Parrot if (of_property_read_bool(np, "input")) 710f625d460SBenoit Parrot *dflags |= GPIOD_IN; 711f625d460SBenoit Parrot else if (of_property_read_bool(np, "output-low")) 712f625d460SBenoit Parrot *dflags |= GPIOD_OUT_LOW; 713f625d460SBenoit Parrot else if (of_property_read_bool(np, "output-high")) 714f625d460SBenoit Parrot *dflags |= GPIOD_OUT_HIGH; 715f625d460SBenoit Parrot else { 71662cdcb6cSRob Herring pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", 71762cdcb6cSRob Herring desc_to_gpio(desc), np); 718f625d460SBenoit Parrot return ERR_PTR(-EINVAL); 719f625d460SBenoit Parrot } 720f625d460SBenoit Parrot 721f625d460SBenoit Parrot if (name && of_property_read_string(np, "line-name", name)) 722f625d460SBenoit Parrot *name = np->name; 723f625d460SBenoit Parrot 724be715343SMasahiro Yamada return desc; 725f625d460SBenoit Parrot } 726f625d460SBenoit Parrot 727f625d460SBenoit Parrot /** 728bc21077eSGeert Uytterhoeven * of_gpiochip_add_hog - Add all hogs in a hog device node 729bc21077eSGeert Uytterhoeven * @chip: gpio chip to act on 730bc21077eSGeert Uytterhoeven * @hog: device node describing the hogs 731bc21077eSGeert Uytterhoeven * 732bc21077eSGeert Uytterhoeven * Returns error if it fails otherwise 0 on success. 733bc21077eSGeert Uytterhoeven */ 734bc21077eSGeert Uytterhoeven static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) 735bc21077eSGeert Uytterhoeven { 736bc21077eSGeert Uytterhoeven enum gpiod_flags dflags; 737bc21077eSGeert Uytterhoeven struct gpio_desc *desc; 738bc21077eSGeert Uytterhoeven unsigned long lflags; 739bc21077eSGeert Uytterhoeven const char *name; 740bc21077eSGeert Uytterhoeven unsigned int i; 741bc21077eSGeert Uytterhoeven int ret; 742bc21077eSGeert Uytterhoeven 743bc21077eSGeert Uytterhoeven for (i = 0;; i++) { 744bc21077eSGeert Uytterhoeven desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); 745bc21077eSGeert Uytterhoeven if (IS_ERR(desc)) 746bc21077eSGeert Uytterhoeven break; 747bc21077eSGeert Uytterhoeven 748bc21077eSGeert Uytterhoeven ret = gpiod_hog(desc, name, lflags, dflags); 749bc21077eSGeert Uytterhoeven if (ret < 0) 750bc21077eSGeert Uytterhoeven return ret; 75163636d95SGeert Uytterhoeven 75263636d95SGeert Uytterhoeven #ifdef CONFIG_OF_DYNAMIC 75363636d95SGeert Uytterhoeven desc->hog = hog; 75463636d95SGeert Uytterhoeven #endif 755bc21077eSGeert Uytterhoeven } 756bc21077eSGeert Uytterhoeven 757bc21077eSGeert Uytterhoeven return 0; 758bc21077eSGeert Uytterhoeven } 759bc21077eSGeert Uytterhoeven 760bc21077eSGeert Uytterhoeven /** 761fd7337fdSMarkus Pargmann * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions 762f625d460SBenoit Parrot * @chip: gpio chip to act on 763f625d460SBenoit Parrot * 764f625d460SBenoit Parrot * This is only used by of_gpiochip_add to request/set GPIO initial 765f625d460SBenoit Parrot * configuration. 766ead066e6SGeert Uytterhoeven * It returns error if it fails otherwise 0 on success. 767f625d460SBenoit Parrot */ 768dfbd379bSLaxman Dewangan static int of_gpiochip_scan_gpios(struct gpio_chip *chip) 769f625d460SBenoit Parrot { 770f625d460SBenoit Parrot struct device_node *np; 771dfbd379bSLaxman Dewangan int ret; 772f625d460SBenoit Parrot 773d1279d94SLaxman Dewangan for_each_available_child_of_node(chip->of_node, np) { 774f625d460SBenoit Parrot if (!of_property_read_bool(np, "gpio-hog")) 775f625d460SBenoit Parrot continue; 776f625d460SBenoit Parrot 777bc21077eSGeert Uytterhoeven ret = of_gpiochip_add_hog(chip, np); 77809e258afSWei Yongjun if (ret < 0) { 77909e258afSWei Yongjun of_node_put(np); 780dfbd379bSLaxman Dewangan return ret; 781f625d460SBenoit Parrot } 78263636d95SGeert Uytterhoeven 78363636d95SGeert Uytterhoeven of_node_set_flag(np, OF_POPULATED); 78409e258afSWei Yongjun } 785dfbd379bSLaxman Dewangan 786dfbd379bSLaxman Dewangan return 0; 787f625d460SBenoit Parrot } 788f625d460SBenoit Parrot 78963636d95SGeert Uytterhoeven #ifdef CONFIG_OF_DYNAMIC 79063636d95SGeert Uytterhoeven /** 79163636d95SGeert Uytterhoeven * of_gpiochip_remove_hog - Remove all hogs in a hog device node 79263636d95SGeert Uytterhoeven * @chip: gpio chip to act on 79363636d95SGeert Uytterhoeven * @hog: device node describing the hogs 79463636d95SGeert Uytterhoeven */ 79563636d95SGeert Uytterhoeven static void of_gpiochip_remove_hog(struct gpio_chip *chip, 79663636d95SGeert Uytterhoeven struct device_node *hog) 79763636d95SGeert Uytterhoeven { 79880c78fbeSAndy Shevchenko struct gpio_desc *desc; 79963636d95SGeert Uytterhoeven 80057017eddSAndy Shevchenko for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED) 80180c78fbeSAndy Shevchenko if (desc->hog == hog) 80280c78fbeSAndy Shevchenko gpiochip_free_own_desc(desc); 80363636d95SGeert Uytterhoeven } 80463636d95SGeert Uytterhoeven 80563636d95SGeert Uytterhoeven static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) 80663636d95SGeert Uytterhoeven { 807597a8a88SAndy Shevchenko return device_match_of_node(&chip->gpiodev->dev, data); 80863636d95SGeert Uytterhoeven } 80963636d95SGeert Uytterhoeven 81063636d95SGeert Uytterhoeven static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) 81163636d95SGeert Uytterhoeven { 81263636d95SGeert Uytterhoeven return gpiochip_find(np, of_gpiochip_match_node); 81363636d95SGeert Uytterhoeven } 81463636d95SGeert Uytterhoeven 81563636d95SGeert Uytterhoeven static int of_gpio_notify(struct notifier_block *nb, unsigned long action, 81663636d95SGeert Uytterhoeven void *arg) 81763636d95SGeert Uytterhoeven { 81863636d95SGeert Uytterhoeven struct of_reconfig_data *rd = arg; 81963636d95SGeert Uytterhoeven struct gpio_chip *chip; 82063636d95SGeert Uytterhoeven int ret; 82163636d95SGeert Uytterhoeven 82263636d95SGeert Uytterhoeven /* 82363636d95SGeert Uytterhoeven * This only supports adding and removing complete gpio-hog nodes. 82463636d95SGeert Uytterhoeven * Modifying an existing gpio-hog node is not supported (except for 82563636d95SGeert Uytterhoeven * changing its "status" property, which is treated the same as 82663636d95SGeert Uytterhoeven * addition/removal). 82763636d95SGeert Uytterhoeven */ 82863636d95SGeert Uytterhoeven switch (of_reconfig_get_state_change(action, arg)) { 82963636d95SGeert Uytterhoeven case OF_RECONFIG_CHANGE_ADD: 83063636d95SGeert Uytterhoeven if (!of_property_read_bool(rd->dn, "gpio-hog")) 83163636d95SGeert Uytterhoeven return NOTIFY_OK; /* not for us */ 83263636d95SGeert Uytterhoeven 83363636d95SGeert Uytterhoeven if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) 83463636d95SGeert Uytterhoeven return NOTIFY_OK; 83563636d95SGeert Uytterhoeven 83663636d95SGeert Uytterhoeven chip = of_find_gpiochip_by_node(rd->dn->parent); 83763636d95SGeert Uytterhoeven if (chip == NULL) 83863636d95SGeert Uytterhoeven return NOTIFY_OK; /* not for us */ 83963636d95SGeert Uytterhoeven 84063636d95SGeert Uytterhoeven ret = of_gpiochip_add_hog(chip, rd->dn); 84163636d95SGeert Uytterhoeven if (ret < 0) { 84263636d95SGeert Uytterhoeven pr_err("%s: failed to add hogs for %pOF\n", __func__, 84363636d95SGeert Uytterhoeven rd->dn); 84463636d95SGeert Uytterhoeven of_node_clear_flag(rd->dn, OF_POPULATED); 84563636d95SGeert Uytterhoeven return notifier_from_errno(ret); 84663636d95SGeert Uytterhoeven } 84763636d95SGeert Uytterhoeven break; 84863636d95SGeert Uytterhoeven 84963636d95SGeert Uytterhoeven case OF_RECONFIG_CHANGE_REMOVE: 85063636d95SGeert Uytterhoeven if (!of_node_check_flag(rd->dn, OF_POPULATED)) 85163636d95SGeert Uytterhoeven return NOTIFY_OK; /* already depopulated */ 85263636d95SGeert Uytterhoeven 85363636d95SGeert Uytterhoeven chip = of_find_gpiochip_by_node(rd->dn->parent); 85463636d95SGeert Uytterhoeven if (chip == NULL) 85563636d95SGeert Uytterhoeven return NOTIFY_OK; /* not for us */ 85663636d95SGeert Uytterhoeven 85763636d95SGeert Uytterhoeven of_gpiochip_remove_hog(chip, rd->dn); 85863636d95SGeert Uytterhoeven of_node_clear_flag(rd->dn, OF_POPULATED); 85963636d95SGeert Uytterhoeven break; 86063636d95SGeert Uytterhoeven } 86163636d95SGeert Uytterhoeven 86263636d95SGeert Uytterhoeven return NOTIFY_OK; 86363636d95SGeert Uytterhoeven } 86463636d95SGeert Uytterhoeven 86563636d95SGeert Uytterhoeven struct notifier_block gpio_of_notifier = { 86663636d95SGeert Uytterhoeven .notifier_call = of_gpio_notify, 86763636d95SGeert Uytterhoeven }; 86863636d95SGeert Uytterhoeven #endif /* CONFIG_OF_DYNAMIC */ 86963636d95SGeert Uytterhoeven 870f625d460SBenoit Parrot /** 87167049c50SThierry Reding * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags 872f141ed65SGrant Likely * @gc: pointer to the gpio_chip structure 87367049c50SThierry Reding * @gpiospec: GPIO specifier as found in the device tree 874f141ed65SGrant Likely * @flags: a flags pointer to fill in 875f141ed65SGrant Likely * 876f141ed65SGrant Likely * This is simple translation function, suitable for the most 1:1 mapped 87767049c50SThierry Reding * GPIO chips. This function performs only one sanity check: whether GPIO 878f141ed65SGrant Likely * is less than ngpios (that is specified in the gpio_chip). 879f141ed65SGrant Likely */ 880b0c7e73bSGeert Uytterhoeven static int of_gpio_simple_xlate(struct gpio_chip *gc, 881b0c7e73bSGeert Uytterhoeven const struct of_phandle_args *gpiospec, 882b0c7e73bSGeert Uytterhoeven u32 *flags) 883f141ed65SGrant Likely { 884f141ed65SGrant Likely /* 885f141ed65SGrant Likely * We're discouraging gpio_cells < 2, since that way you'll have to 88620a8a968SColin Cronin * write your own xlate function (that will have to retrieve the GPIO 887f141ed65SGrant Likely * number and the flags from a single gpio cell -- this is possible, 888f141ed65SGrant Likely * but not recommended). 889f141ed65SGrant Likely */ 890f141ed65SGrant Likely if (gc->of_gpio_n_cells < 2) { 891f141ed65SGrant Likely WARN_ON(1); 892f141ed65SGrant Likely return -EINVAL; 893f141ed65SGrant Likely } 894f141ed65SGrant Likely 895f141ed65SGrant Likely if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) 896f141ed65SGrant Likely return -EINVAL; 897f141ed65SGrant Likely 8987b96c686SGrant Likely if (gpiospec->args[0] >= gc->ngpio) 899f141ed65SGrant Likely return -EINVAL; 900f141ed65SGrant Likely 901f141ed65SGrant Likely if (flags) 902f141ed65SGrant Likely *flags = gpiospec->args[1]; 903f141ed65SGrant Likely 904f141ed65SGrant Likely return gpiospec->args[0]; 905f141ed65SGrant Likely } 906f141ed65SGrant Likely 907f141ed65SGrant Likely /** 9083208b0f0SLinus Walleij * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) 909f141ed65SGrant Likely * @np: device node of the GPIO chip 910f141ed65SGrant Likely * @mm_gc: pointer to the of_mm_gpio_chip allocated structure 9113208b0f0SLinus Walleij * @data: driver data to store in the struct gpio_chip 912f141ed65SGrant Likely * 913f141ed65SGrant Likely * To use this function you should allocate and fill mm_gc with: 914f141ed65SGrant Likely * 915f141ed65SGrant Likely * 1) In the gpio_chip structure: 916f141ed65SGrant Likely * - all the callbacks 917f141ed65SGrant Likely * - of_gpio_n_cells 918f141ed65SGrant Likely * - of_xlate callback (optional) 919f141ed65SGrant Likely * 920f141ed65SGrant Likely * 3) In the of_mm_gpio_chip structure: 921f141ed65SGrant Likely * - save_regs callback (optional) 922f141ed65SGrant Likely * 923f141ed65SGrant Likely * If succeeded, this function will map bank's memory and will 924f141ed65SGrant Likely * do all necessary work for you. Then you'll able to use .regs 925f141ed65SGrant Likely * to manage GPIOs from the callbacks. 926f141ed65SGrant Likely */ 9273208b0f0SLinus Walleij int of_mm_gpiochip_add_data(struct device_node *np, 9283208b0f0SLinus Walleij struct of_mm_gpio_chip *mm_gc, 9293208b0f0SLinus Walleij void *data) 930f141ed65SGrant Likely { 931f141ed65SGrant Likely int ret = -ENOMEM; 932f141ed65SGrant Likely struct gpio_chip *gc = &mm_gc->gc; 933f141ed65SGrant Likely 9347eb6ce2fSRob Herring gc->label = kasprintf(GFP_KERNEL, "%pOF", np); 935f141ed65SGrant Likely if (!gc->label) 936f141ed65SGrant Likely goto err0; 937f141ed65SGrant Likely 938f141ed65SGrant Likely mm_gc->regs = of_iomap(np, 0); 939f141ed65SGrant Likely if (!mm_gc->regs) 940f141ed65SGrant Likely goto err1; 941f141ed65SGrant Likely 942f141ed65SGrant Likely gc->base = -1; 943f141ed65SGrant Likely 944f141ed65SGrant Likely if (mm_gc->save_regs) 945f141ed65SGrant Likely mm_gc->save_regs(mm_gc); 946f141ed65SGrant Likely 9475d07a692SLiang He of_node_put(mm_gc->gc.of_node); 9485d07a692SLiang He mm_gc->gc.of_node = of_node_get(np); 949f141ed65SGrant Likely 9503208b0f0SLinus Walleij ret = gpiochip_add_data(gc, data); 951f141ed65SGrant Likely if (ret) 952f141ed65SGrant Likely goto err2; 953f141ed65SGrant Likely 954f141ed65SGrant Likely return 0; 955f141ed65SGrant Likely err2: 9565d07a692SLiang He of_node_put(np); 957f141ed65SGrant Likely iounmap(mm_gc->regs); 958f141ed65SGrant Likely err1: 959f141ed65SGrant Likely kfree(gc->label); 960f141ed65SGrant Likely err0: 9617eb6ce2fSRob Herring pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); 962f141ed65SGrant Likely return ret; 963f141ed65SGrant Likely } 9646d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data); 965f141ed65SGrant Likely 966d621e8baSRicardo Ribalda Delgado /** 967d621e8baSRicardo Ribalda Delgado * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) 968d621e8baSRicardo Ribalda Delgado * @mm_gc: pointer to the of_mm_gpio_chip allocated structure 969d621e8baSRicardo Ribalda Delgado */ 970d621e8baSRicardo Ribalda Delgado void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) 971d621e8baSRicardo Ribalda Delgado { 972d621e8baSRicardo Ribalda Delgado struct gpio_chip *gc = &mm_gc->gc; 973d621e8baSRicardo Ribalda Delgado 974d621e8baSRicardo Ribalda Delgado if (!mm_gc) 975d621e8baSRicardo Ribalda Delgado return; 976d621e8baSRicardo Ribalda Delgado 977d621e8baSRicardo Ribalda Delgado gpiochip_remove(gc); 978d621e8baSRicardo Ribalda Delgado iounmap(mm_gc->regs); 979d621e8baSRicardo Ribalda Delgado kfree(gc->label); 980d621e8baSRicardo Ribalda Delgado } 9816d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); 982d621e8baSRicardo Ribalda Delgado 983726cb3baSStephen Boyd static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) 984726cb3baSStephen Boyd { 985726cb3baSStephen Boyd int len, i; 986726cb3baSStephen Boyd u32 start, count; 987726cb3baSStephen Boyd struct device_node *np = chip->of_node; 988726cb3baSStephen Boyd 989726cb3baSStephen Boyd len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); 990726cb3baSStephen Boyd if (len < 0 || len % 2 != 0) 991726cb3baSStephen Boyd return; 992726cb3baSStephen Boyd 993726cb3baSStephen Boyd for (i = 0; i < len; i += 2) { 994726cb3baSStephen Boyd of_property_read_u32_index(np, "gpio-reserved-ranges", 995726cb3baSStephen Boyd i, &start); 996726cb3baSStephen Boyd of_property_read_u32_index(np, "gpio-reserved-ranges", 997726cb3baSStephen Boyd i + 1, &count); 998e75f88efSAndrei Lalaev if (start >= chip->ngpio || start + count > chip->ngpio) 999726cb3baSStephen Boyd continue; 1000726cb3baSStephen Boyd 1001726cb3baSStephen Boyd bitmap_clear(chip->valid_mask, start, count); 1002726cb3baSStephen Boyd } 1003726cb3baSStephen Boyd }; 1004726cb3baSStephen Boyd 1005f23f1516SShiraz Hashim #ifdef CONFIG_PINCTRL 100628355f81STomeu Vizoso static int of_gpiochip_add_pin_range(struct gpio_chip *chip) 1007f23f1516SShiraz Hashim { 1008f23f1516SShiraz Hashim struct device_node *np = chip->of_node; 1009f23f1516SShiraz Hashim struct of_phandle_args pinspec; 10101e63d7b9SLinus Walleij struct pinctrl_dev *pctldev; 1011f23f1516SShiraz Hashim int index = 0, ret; 1012586a87e6SChristian Ruppert const char *name; 1013586a87e6SChristian Ruppert static const char group_names_propname[] = "gpio-ranges-group-names"; 1014586a87e6SChristian Ruppert struct property *group_names; 1015f23f1516SShiraz Hashim 1016f23f1516SShiraz Hashim if (!np) 101728355f81STomeu Vizoso return 0; 1018f23f1516SShiraz Hashim 10193550bba2SStefan Wahren if (!of_property_read_bool(np, "gpio-ranges") && 10203550bba2SStefan Wahren chip->of_gpio_ranges_fallback) { 10213550bba2SStefan Wahren return chip->of_gpio_ranges_fallback(chip, np); 10223550bba2SStefan Wahren } 10233550bba2SStefan Wahren 1024586a87e6SChristian Ruppert group_names = of_find_property(np, group_names_propname, NULL); 1025586a87e6SChristian Ruppert 1026ad4e1a7cSHaojian Zhuang for (;; index++) { 1027d9fe0039SStephen Warren ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 1028d9fe0039SStephen Warren index, &pinspec); 1029f23f1516SShiraz Hashim if (ret) 1030f23f1516SShiraz Hashim break; 1031f23f1516SShiraz Hashim 10321e63d7b9SLinus Walleij pctldev = of_pinctrl_get(pinspec.np); 1033602cf638SMasahiro Yamada of_node_put(pinspec.np); 10341e63d7b9SLinus Walleij if (!pctldev) 103528355f81STomeu Vizoso return -EPROBE_DEFER; 1036f23f1516SShiraz Hashim 1037586a87e6SChristian Ruppert if (pinspec.args[2]) { 1038586a87e6SChristian Ruppert if (group_names) { 103972858602SLaurent Navet of_property_read_string_index(np, 1040586a87e6SChristian Ruppert group_names_propname, 1041586a87e6SChristian Ruppert index, &name); 1042586a87e6SChristian Ruppert if (strlen(name)) { 10437eb6ce2fSRob Herring pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", 10447eb6ce2fSRob Herring np); 1045586a87e6SChristian Ruppert break; 1046586a87e6SChristian Ruppert } 1047586a87e6SChristian Ruppert } 1048586a87e6SChristian Ruppert /* npins != 0: linear range */ 10491e63d7b9SLinus Walleij ret = gpiochip_add_pin_range(chip, 1050ef5e3eefSHaojian Zhuang pinctrl_dev_get_devname(pctldev), 10511e63d7b9SLinus Walleij pinspec.args[0], 105286853c83SHaojian Zhuang pinspec.args[1], 105386853c83SHaojian Zhuang pinspec.args[2]); 10541e63d7b9SLinus Walleij if (ret) 105528355f81STomeu Vizoso return ret; 1056586a87e6SChristian Ruppert } else { 1057586a87e6SChristian Ruppert /* npins == 0: special range */ 1058586a87e6SChristian Ruppert if (pinspec.args[1]) { 10597eb6ce2fSRob Herring pr_err("%pOF: Illegal gpio-range format.\n", 10607eb6ce2fSRob Herring np); 1061586a87e6SChristian Ruppert break; 1062586a87e6SChristian Ruppert } 1063586a87e6SChristian Ruppert 1064586a87e6SChristian Ruppert if (!group_names) { 10657eb6ce2fSRob Herring pr_err("%pOF: GPIO group range requested but no %s property.\n", 10667eb6ce2fSRob Herring np, group_names_propname); 1067586a87e6SChristian Ruppert break; 1068586a87e6SChristian Ruppert } 1069586a87e6SChristian Ruppert 1070586a87e6SChristian Ruppert ret = of_property_read_string_index(np, 1071586a87e6SChristian Ruppert group_names_propname, 1072586a87e6SChristian Ruppert index, &name); 1073586a87e6SChristian Ruppert if (ret) 1074586a87e6SChristian Ruppert break; 1075586a87e6SChristian Ruppert 1076586a87e6SChristian Ruppert if (!strlen(name)) { 10777eb6ce2fSRob Herring pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", 10787eb6ce2fSRob Herring np); 1079586a87e6SChristian Ruppert break; 1080586a87e6SChristian Ruppert } 1081586a87e6SChristian Ruppert 1082586a87e6SChristian Ruppert ret = gpiochip_add_pingroup_range(chip, pctldev, 1083586a87e6SChristian Ruppert pinspec.args[0], name); 1084586a87e6SChristian Ruppert if (ret) 108528355f81STomeu Vizoso return ret; 1086586a87e6SChristian Ruppert } 1087ad4e1a7cSHaojian Zhuang } 108828355f81STomeu Vizoso 108928355f81STomeu Vizoso return 0; 1090f23f1516SShiraz Hashim } 1091f23f1516SShiraz Hashim 1092f23f1516SShiraz Hashim #else 109328355f81STomeu Vizoso static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } 1094f23f1516SShiraz Hashim #endif 1095f23f1516SShiraz Hashim 109628355f81STomeu Vizoso int of_gpiochip_add(struct gpio_chip *chip) 1097f141ed65SGrant Likely { 1098f0d1ab05SLinus Walleij int ret; 109928355f81STomeu Vizoso 1100f141ed65SGrant Likely if (!chip->of_node) 110128355f81STomeu Vizoso return 0; 1102f141ed65SGrant Likely 1103f141ed65SGrant Likely if (!chip->of_xlate) { 1104f141ed65SGrant Likely chip->of_gpio_n_cells = 2; 1105f141ed65SGrant Likely chip->of_xlate = of_gpio_simple_xlate; 1106f141ed65SGrant Likely } 1107f141ed65SGrant Likely 11081020dfd1SMasahiro Yamada if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) 11091020dfd1SMasahiro Yamada return -EINVAL; 11101020dfd1SMasahiro Yamada 1111726cb3baSStephen Boyd of_gpiochip_init_valid_mask(chip); 1112726cb3baSStephen Boyd 1113f0d1ab05SLinus Walleij ret = of_gpiochip_add_pin_range(chip); 1114f0d1ab05SLinus Walleij if (ret) 1115f0d1ab05SLinus Walleij return ret; 111628355f81STomeu Vizoso 1117f141ed65SGrant Likely of_node_get(chip->of_node); 1118f625d460SBenoit Parrot 1119f0d1ab05SLinus Walleij ret = of_gpiochip_scan_gpios(chip); 11202f4133bbSAndy Shevchenko if (ret) 1121f7299d44SGeert Uytterhoeven of_node_put(chip->of_node); 1122f7299d44SGeert Uytterhoeven 1123f0d1ab05SLinus Walleij return ret; 1124f141ed65SGrant Likely } 1125f141ed65SGrant Likely 1126f141ed65SGrant Likely void of_gpiochip_remove(struct gpio_chip *chip) 1127f141ed65SGrant Likely { 1128f141ed65SGrant Likely of_node_put(chip->of_node); 1129f141ed65SGrant Likely } 11304731210cSSaravana Kannan 11314731210cSSaravana Kannan void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) 11324731210cSSaravana Kannan { 11331df62542SAndy Shevchenko /* Set default OF node to parent's one if present */ 11341df62542SAndy Shevchenko if (gc->parent) 11351df62542SAndy Shevchenko gdev->dev.of_node = gc->parent->of_node; 11361df62542SAndy Shevchenko 1137ac627260SBartosz Golaszewski if (gc->fwnode) 1138ac627260SBartosz Golaszewski gc->of_node = to_of_node(gc->fwnode); 1139ac627260SBartosz Golaszewski 11404731210cSSaravana Kannan /* If the gpiochip has an assigned OF node this takes precedence */ 11414731210cSSaravana Kannan if (gc->of_node) 11424731210cSSaravana Kannan gdev->dev.of_node = gc->of_node; 11434731210cSSaravana Kannan else 11444731210cSSaravana Kannan gc->of_node = gdev->dev.of_node; 11454731210cSSaravana Kannan } 1146