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 88*d59fdbc7SAndy 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 189e6ae9a83SKrzysztof Kozlowski static void of_gpio_flags_quirks(const struct device_node *np, 19089a5e15bSLinus Walleij const char *propname, 1916953c57aSLinus Walleij enum of_gpio_flags *flags, 1926953c57aSLinus Walleij int index) 193a603a2b8SLinus Walleij { 19499d18d42SDmitry Torokhov of_gpio_try_fixup_polarity(np, propname, flags); 19599d18d42SDmitry Torokhov 196a603a2b8SLinus Walleij /* 197a603a2b8SLinus Walleij * Some GPIO fixed regulator quirks. 198a603a2b8SLinus Walleij * Note that active low is the default. 199a603a2b8SLinus Walleij */ 200a603a2b8SLinus Walleij if (IS_ENABLED(CONFIG_REGULATOR) && 201906402a4SLinus Walleij (of_device_is_compatible(np, "regulator-fixed") || 202906402a4SLinus Walleij of_device_is_compatible(np, "reg-fixed-voltage") || 203a71a81e7SGeert Uytterhoeven (!(strcmp(propname, "enable-gpio") && 204a71a81e7SGeert Uytterhoeven strcmp(propname, "enable-gpios")) && 205a71a81e7SGeert Uytterhoeven of_device_is_compatible(np, "regulator-gpio")))) { 206e3186e36SDmitry Torokhov bool active_high = of_property_read_bool(np, 207228fc010SLucas Stach "enable-active-high"); 208a603a2b8SLinus Walleij /* 209a603a2b8SLinus Walleij * The regulator GPIO handles are specified such that the 210a603a2b8SLinus Walleij * presence or absence of "enable-active-high" solely controls 211a603a2b8SLinus Walleij * the polarity of the GPIO line. Any phandle flags must 212a603a2b8SLinus Walleij * be actively ignored. 213a603a2b8SLinus Walleij */ 214e3186e36SDmitry Torokhov of_gpio_quirk_polarity(np, active_high, flags); 215a603a2b8SLinus Walleij } 216a603a2b8SLinus Walleij /* 217a603a2b8SLinus Walleij * Legacy open drain handling for fixed voltage regulators. 218a603a2b8SLinus Walleij */ 219a603a2b8SLinus Walleij if (IS_ENABLED(CONFIG_REGULATOR) && 220a603a2b8SLinus Walleij of_device_is_compatible(np, "reg-fixed-voltage") && 221a603a2b8SLinus Walleij of_property_read_bool(np, "gpio-open-drain")) { 222a603a2b8SLinus Walleij *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); 223a603a2b8SLinus Walleij pr_info("%s uses legacy open drain flag - update the DTS if you can\n", 224a603a2b8SLinus Walleij of_node_full_name(np)); 225a603a2b8SLinus Walleij } 2266953c57aSLinus Walleij 2276953c57aSLinus Walleij /* 2286953c57aSLinus Walleij * Legacy handling of SPI active high chip select. If we have a 2296953c57aSLinus Walleij * property named "cs-gpios" we need to inspect the child node 2306953c57aSLinus Walleij * to determine if the flags should have inverted semantics. 2316953c57aSLinus Walleij */ 232da7f1349SLinus Walleij if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") && 233a71a81e7SGeert Uytterhoeven of_property_read_bool(np, "cs-gpios")) { 2346953c57aSLinus Walleij struct device_node *child; 2356953c57aSLinus Walleij u32 cs; 2366953c57aSLinus Walleij int ret; 2376953c57aSLinus Walleij 2386953c57aSLinus Walleij for_each_child_of_node(np, child) { 2396953c57aSLinus Walleij ret = of_property_read_u32(child, "reg", &cs); 240c1c04ceaSLinus Walleij if (ret) 2416953c57aSLinus Walleij continue; 2426953c57aSLinus Walleij if (cs == index) { 2436953c57aSLinus Walleij /* 2446953c57aSLinus Walleij * SPI children have active low chip selects 2456953c57aSLinus Walleij * by default. This can be specified negatively 2466953c57aSLinus Walleij * by just omitting "spi-cs-high" in the 2476953c57aSLinus Walleij * device node, or actively by tagging on 2486953c57aSLinus Walleij * GPIO_ACTIVE_LOW as flag in the device 2496953c57aSLinus Walleij * tree. If the line is simultaneously 2506953c57aSLinus Walleij * tagged as active low in the device tree 2516953c57aSLinus Walleij * and has the "spi-cs-high" set, we get a 2526953c57aSLinus Walleij * conflict and the "spi-cs-high" flag will 2536953c57aSLinus Walleij * take precedence. 2546953c57aSLinus Walleij */ 255e3186e36SDmitry Torokhov bool active_high = of_property_read_bool(child, 256e3186e36SDmitry Torokhov "spi-cs-high"); 257e3186e36SDmitry Torokhov of_gpio_quirk_polarity(child, active_high, 258e3186e36SDmitry Torokhov flags); 25989fea04cSNishka Dasgupta of_node_put(child); 2606953c57aSLinus Walleij break; 2616953c57aSLinus Walleij } 2626953c57aSLinus Walleij } 2636953c57aSLinus Walleij } 264edc1ef3fSMartin Blumenstingl 265edc1ef3fSMartin Blumenstingl /* Legacy handling of stmmac's active-low PHY reset line */ 266edc1ef3fSMartin Blumenstingl if (IS_ENABLED(CONFIG_STMMAC_ETH) && 267edc1ef3fSMartin Blumenstingl !strcmp(propname, "snps,reset-gpio") && 268edc1ef3fSMartin Blumenstingl of_property_read_bool(np, "snps,reset-active-low")) 269edc1ef3fSMartin Blumenstingl *flags |= OF_GPIO_ACTIVE_LOW; 270b02c85c9SDmitry Torokhov 271b02c85c9SDmitry Torokhov /* 272b02c85c9SDmitry Torokhov * Freescale Fast Ethernet Controller uses a separate property to 273b02c85c9SDmitry Torokhov * describe polarity of the phy reset line. 274b02c85c9SDmitry Torokhov */ 275b02c85c9SDmitry Torokhov if (IS_ENABLED(CONFIG_FEC)) { 276b02c85c9SDmitry Torokhov static const char * const fec_devices[] = { 277b02c85c9SDmitry Torokhov "fsl,imx25-fec", 278b02c85c9SDmitry Torokhov "fsl,imx27-fec", 279b02c85c9SDmitry Torokhov "fsl,imx28-fec", 280b02c85c9SDmitry Torokhov "fsl,imx6q-fec", 281b02c85c9SDmitry Torokhov "fsl,mvf600-fec", 282b02c85c9SDmitry Torokhov "fsl,imx6sx-fec", 283b02c85c9SDmitry Torokhov "fsl,imx6ul-fec", 284b02c85c9SDmitry Torokhov "fsl,imx8mq-fec", 285b02c85c9SDmitry Torokhov "fsl,imx8qm-fec", 286b02c85c9SDmitry Torokhov "fsl,s32v234-fec", 287b02c85c9SDmitry Torokhov NULL 288b02c85c9SDmitry Torokhov }; 289b02c85c9SDmitry Torokhov 290b02c85c9SDmitry Torokhov if (!strcmp(propname, "phy-reset-gpios") && 291b02c85c9SDmitry Torokhov of_device_compatible_match(np, fec_devices)) { 292b02c85c9SDmitry Torokhov bool active_high = of_property_read_bool(np, 293b02c85c9SDmitry Torokhov "phy-reset-active-high"); 294b02c85c9SDmitry Torokhov of_gpio_quirk_polarity(np, active_high, flags); 295b02c85c9SDmitry Torokhov } 296b02c85c9SDmitry Torokhov } 297a603a2b8SLinus Walleij } 298a603a2b8SLinus Walleij 299f141ed65SGrant Likely /** 300af8b6375SAlexandre Courbot * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API 301f141ed65SGrant Likely * @np: device node to get GPIO from 302f141ed65SGrant Likely * @propname: property name containing gpio specifier(s) 303f141ed65SGrant Likely * @index: index of the GPIO 304f141ed65SGrant Likely * @flags: a flags pointer to fill in 305f141ed65SGrant Likely * 306af8b6375SAlexandre Courbot * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno 307f141ed65SGrant Likely * value on the error condition. If @flags is not NULL the function also fills 308f141ed65SGrant Likely * in flags for the GPIO. 309f141ed65SGrant Likely */ 310e6ae9a83SKrzysztof Kozlowski static struct gpio_desc *of_get_named_gpiod_flags(const struct device_node *np, 311af8b6375SAlexandre Courbot const char *propname, int index, enum of_gpio_flags *flags) 312f141ed65SGrant Likely { 313762c2e46SMasahiro Yamada struct of_phandle_args gpiospec; 314762c2e46SMasahiro Yamada struct gpio_chip *chip; 315762c2e46SMasahiro Yamada struct gpio_desc *desc; 316f141ed65SGrant Likely int ret; 317f141ed65SGrant Likely 318c11e6f0fSStephen Boyd ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, 319762c2e46SMasahiro Yamada &gpiospec); 3203d0f7cf0SGrant Likely if (ret) { 3217eb6ce2fSRob Herring pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", 3227eb6ce2fSRob Herring __func__, propname, np, index); 323af8b6375SAlexandre Courbot return ERR_PTR(ret); 3243d0f7cf0SGrant Likely } 325f141ed65SGrant Likely 326c7e9d398SMasahiro Yamada chip = of_find_gpiochip_by_xlate(&gpiospec); 327762c2e46SMasahiro Yamada if (!chip) { 328762c2e46SMasahiro Yamada desc = ERR_PTR(-EPROBE_DEFER); 329762c2e46SMasahiro Yamada goto out; 330762c2e46SMasahiro Yamada } 3313d0f7cf0SGrant Likely 33299468c1aSMasahiro Yamada desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); 333762c2e46SMasahiro Yamada if (IS_ERR(desc)) 334762c2e46SMasahiro Yamada goto out; 335762c2e46SMasahiro Yamada 336605f2d34SLinus Walleij if (flags) 33789a5e15bSLinus Walleij of_gpio_flags_quirks(np, propname, flags, index); 338a603a2b8SLinus Walleij 3397eb6ce2fSRob Herring pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", 3407eb6ce2fSRob Herring __func__, propname, np, index, 341762c2e46SMasahiro Yamada PTR_ERR_OR_ZERO(desc)); 342762c2e46SMasahiro Yamada 343762c2e46SMasahiro Yamada out: 344762c2e46SMasahiro Yamada of_node_put(gpiospec.np); 345762c2e46SMasahiro Yamada 346762c2e46SMasahiro Yamada return desc; 347f141ed65SGrant Likely } 348f141ed65SGrant Likely 349e6ae9a83SKrzysztof Kozlowski int of_get_named_gpio_flags(const struct device_node *np, const char *list_name, 350f01d9075SAlexandre Courbot int index, enum of_gpio_flags *flags) 351f01d9075SAlexandre Courbot { 352f01d9075SAlexandre Courbot struct gpio_desc *desc; 353f01d9075SAlexandre Courbot 354f01d9075SAlexandre Courbot desc = of_get_named_gpiod_flags(np, list_name, index, flags); 355f01d9075SAlexandre Courbot 356f01d9075SAlexandre Courbot if (IS_ERR(desc)) 357f01d9075SAlexandre Courbot return PTR_ERR(desc); 358f01d9075SAlexandre Courbot else 359f01d9075SAlexandre Courbot return desc_to_gpio(desc); 360f01d9075SAlexandre Courbot } 3616d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(of_get_named_gpio_flags); 362f01d9075SAlexandre Courbot 363d9e7f0e3SDmitry Torokhov /* Converts gpio_lookup_flags into bitmask of GPIO_* values */ 364d9e7f0e3SDmitry Torokhov static unsigned long of_convert_gpio_flags(enum of_gpio_flags flags) 365d9e7f0e3SDmitry Torokhov { 366d9e7f0e3SDmitry Torokhov unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 367d9e7f0e3SDmitry Torokhov 368d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_ACTIVE_LOW) 369d9e7f0e3SDmitry Torokhov lflags |= GPIO_ACTIVE_LOW; 370d9e7f0e3SDmitry Torokhov 371d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_SINGLE_ENDED) { 372d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_OPEN_DRAIN) 373d9e7f0e3SDmitry Torokhov lflags |= GPIO_OPEN_DRAIN; 374d9e7f0e3SDmitry Torokhov else 375d9e7f0e3SDmitry Torokhov lflags |= GPIO_OPEN_SOURCE; 376d9e7f0e3SDmitry Torokhov } 377d9e7f0e3SDmitry Torokhov 378d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_TRANSITORY) 379d9e7f0e3SDmitry Torokhov lflags |= GPIO_TRANSITORY; 380d9e7f0e3SDmitry Torokhov 381d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_PULL_UP) 382d9e7f0e3SDmitry Torokhov lflags |= GPIO_PULL_UP; 383d9e7f0e3SDmitry Torokhov 384d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_PULL_DOWN) 385d9e7f0e3SDmitry Torokhov lflags |= GPIO_PULL_DOWN; 386d9e7f0e3SDmitry Torokhov 387d9e7f0e3SDmitry Torokhov if (flags & OF_GPIO_PULL_DISABLE) 388d9e7f0e3SDmitry Torokhov lflags |= GPIO_PULL_DISABLE; 389d9e7f0e3SDmitry Torokhov 390d9e7f0e3SDmitry Torokhov return lflags; 391d9e7f0e3SDmitry Torokhov } 392d9e7f0e3SDmitry Torokhov 393f626d6dfSLinus Walleij /** 394f626d6dfSLinus Walleij * gpiod_get_from_of_node() - obtain a GPIO from an OF node 395f626d6dfSLinus Walleij * @node: handle of the OF node 396f626d6dfSLinus Walleij * @propname: name of the DT property representing the GPIO 397f626d6dfSLinus Walleij * @index: index of the GPIO to obtain for the consumer 398f626d6dfSLinus Walleij * @dflags: GPIO initialization flags 399f626d6dfSLinus Walleij * @label: label to attach to the requested GPIO 400f626d6dfSLinus Walleij * 401f626d6dfSLinus Walleij * Returns: 402f626d6dfSLinus Walleij * On successful request the GPIO pin is configured in accordance with 403f626d6dfSLinus Walleij * provided @dflags. 404f626d6dfSLinus Walleij * 405f626d6dfSLinus Walleij * In case of error an ERR_PTR() is returned. 406f626d6dfSLinus Walleij */ 407e6ae9a83SKrzysztof Kozlowski struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node, 408f626d6dfSLinus Walleij const char *propname, int index, 409f626d6dfSLinus Walleij enum gpiod_flags dflags, 410f626d6dfSLinus Walleij const char *label) 411f626d6dfSLinus Walleij { 412d9e7f0e3SDmitry Torokhov unsigned long lflags; 413f626d6dfSLinus Walleij struct gpio_desc *desc; 414d9e7f0e3SDmitry Torokhov enum of_gpio_flags of_flags; 415f626d6dfSLinus Walleij int ret; 416f626d6dfSLinus Walleij 417d9e7f0e3SDmitry Torokhov desc = of_get_named_gpiod_flags(node, propname, index, &of_flags); 418d9e7f0e3SDmitry Torokhov if (!desc || IS_ERR(desc)) 419f626d6dfSLinus Walleij return desc; 420f626d6dfSLinus Walleij 421f626d6dfSLinus Walleij ret = gpiod_request(desc, label); 422be7ae45cSMarco Felsch if (ret == -EBUSY && (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) 423f626d6dfSLinus Walleij return desc; 424f626d6dfSLinus Walleij if (ret) 425f626d6dfSLinus Walleij return ERR_PTR(ret); 426f626d6dfSLinus Walleij 427d9e7f0e3SDmitry Torokhov lflags = of_convert_gpio_flags(of_flags); 42831bea231SNuno Sá 429f626d6dfSLinus Walleij ret = gpiod_configure_flags(desc, propname, lflags, dflags); 430f626d6dfSLinus Walleij if (ret < 0) { 431f626d6dfSLinus Walleij gpiod_put(desc); 432f626d6dfSLinus Walleij return ERR_PTR(ret); 433f626d6dfSLinus Walleij } 434f626d6dfSLinus Walleij 435f626d6dfSLinus Walleij return desc; 436f626d6dfSLinus Walleij } 4376d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(gpiod_get_from_of_node); 438f141ed65SGrant Likely 439b311c5cbSDmitry Torokhov static struct gpio_desc *of_find_gpio_rename(struct device_node *np, 44098c3c940SDmitry Torokhov const char *con_id, 44198c3c940SDmitry Torokhov unsigned int idx, 442c8582339SLinus Walleij enum of_gpio_flags *of_flags) 443c8582339SLinus Walleij { 444b311c5cbSDmitry Torokhov static const struct of_rename_gpio { 445b311c5cbSDmitry Torokhov const char *con_id; 446b311c5cbSDmitry Torokhov const char *legacy_id; /* NULL - same as con_id */ 447b311c5cbSDmitry Torokhov /* 448b311c5cbSDmitry Torokhov * Compatible string can be set to NULL in case where 449b311c5cbSDmitry Torokhov * matching to a particular compatible is not practical, 450b311c5cbSDmitry Torokhov * but it should only be done for gpio names that have 451b311c5cbSDmitry Torokhov * vendor prefix to reduce risk of false positives. 452b311c5cbSDmitry Torokhov * Addition of such entries is strongly discouraged. 453b311c5cbSDmitry Torokhov */ 454b311c5cbSDmitry Torokhov const char *compatible; 455b311c5cbSDmitry Torokhov } gpios[] = { 456fbbbcd17SDmitry Torokhov #if !IS_ENABLED(CONFIG_LCD_HX8357) 457fbbbcd17SDmitry Torokhov /* Himax LCD controllers used "gpios-reset" */ 458fbbbcd17SDmitry Torokhov { "reset", "gpios-reset", "himax,hx8357" }, 459fbbbcd17SDmitry Torokhov { "reset", "gpios-reset", "himax,hx8369" }, 460fbbbcd17SDmitry Torokhov #endif 461b311c5cbSDmitry Torokhov #if IS_ENABLED(CONFIG_MFD_ARIZONA) 462b311c5cbSDmitry Torokhov { "wlf,reset", NULL, NULL }, 463b311c5cbSDmitry Torokhov #endif 464eaf1a296SDmitry Torokhov #if IS_ENABLED(CONFIG_RTC_DRV_MOXART) 465eaf1a296SDmitry Torokhov { "rtc-data", "gpio-rtc-data", "moxa,moxart-rtc" }, 466eaf1a296SDmitry Torokhov { "rtc-sclk", "gpio-rtc-sclk", "moxa,moxart-rtc" }, 467eaf1a296SDmitry Torokhov { "rtc-reset", "gpio-rtc-reset", "moxa,moxart-rtc" }, 468eaf1a296SDmitry Torokhov #endif 4699c2cc717SDmitry Torokhov #if IS_ENABLED(CONFIG_NFC_MRVL_I2C) 4709c2cc717SDmitry Torokhov { "reset", "reset-n-io", "marvell,nfc-i2c" }, 4719c2cc717SDmitry Torokhov #endif 4729c2cc717SDmitry Torokhov #if IS_ENABLED(CONFIG_NFC_MRVL_SPI) 4739c2cc717SDmitry Torokhov { "reset", "reset-n-io", "marvell,nfc-spi" }, 4749c2cc717SDmitry Torokhov #endif 4759c2cc717SDmitry Torokhov #if IS_ENABLED(CONFIG_NFC_MRVL_UART) 4769c2cc717SDmitry Torokhov { "reset", "reset-n-io", "marvell,nfc-uart" }, 4779c2cc717SDmitry Torokhov { "reset", "reset-n-io", "mrvl,nfc-uart" }, 4789c2cc717SDmitry Torokhov #endif 479fbbbcd17SDmitry Torokhov #if !IS_ENABLED(CONFIG_PCI_LANTIQ) 480fbbbcd17SDmitry Torokhov /* MIPS Lantiq PCI */ 481fbbbcd17SDmitry Torokhov { "reset", "gpios-reset", "lantiq,pci-xway" }, 482fbbbcd17SDmitry Torokhov #endif 483307c593bSDmitry Torokhov 484b311c5cbSDmitry Torokhov /* 485b311c5cbSDmitry Torokhov * Some regulator bindings happened before we managed to 486b311c5cbSDmitry Torokhov * establish that GPIO properties should be named 487b311c5cbSDmitry Torokhov * "foo-gpios" so we have this special kludge for them. 488b311c5cbSDmitry Torokhov */ 489307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1) 490b311c5cbSDmitry Torokhov { "wlf,ldoena", NULL, NULL }, /* Arizona */ 491307c593bSDmitry Torokhov #endif 492307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_REGULATOR_WM8994) 493b311c5cbSDmitry Torokhov { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */ 494b311c5cbSDmitry Torokhov { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */ 495b311c5cbSDmitry Torokhov #endif 496c8582339SLinus Walleij 497944004ebSDmitry Torokhov #if IS_ENABLED(CONFIG_SND_SOC_CS42L56) 498944004ebSDmitry Torokhov { "reset", "cirrus,gpio-nreset", "cirrus,cs42l56" }, 499944004ebSDmitry Torokhov #endif 500fbbbcd17SDmitry Torokhov #if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X) 501fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3x" }, 502fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic33" }, 503fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3007" }, 504fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3104" }, 505fbbbcd17SDmitry Torokhov { "reset", "gpio-reset", "ti,tlv320aic3106" }, 506fbbbcd17SDmitry Torokhov #endif 507307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_SPI_GPIO) 508c8582339SLinus Walleij /* 509b311c5cbSDmitry Torokhov * The SPI GPIO bindings happened before we managed to 510b311c5cbSDmitry Torokhov * establish that GPIO properties should be named 511b311c5cbSDmitry Torokhov * "foo-gpios" so we have this special kludge for them. 512c8582339SLinus Walleij */ 513b311c5cbSDmitry Torokhov { "miso", "gpio-miso", "spi-gpio" }, 514b311c5cbSDmitry Torokhov { "mosi", "gpio-mosi", "spi-gpio" }, 515b311c5cbSDmitry Torokhov { "sck", "gpio-sck", "spi-gpio" }, 516307c593bSDmitry Torokhov #endif 517c8582339SLinus Walleij 5186a537d48SLinus Walleij /* 519b311c5cbSDmitry Torokhov * The old Freescale bindings use simply "gpios" as name 520b311c5cbSDmitry Torokhov * for the chip select lines rather than "cs-gpios" like 521b311c5cbSDmitry Torokhov * all other SPI hardware. Allow this specifically for 522b311c5cbSDmitry Torokhov * Freescale and PPC devices. 523e3023bf8SLinus Walleij */ 524307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_SPI_FSL_SPI) 525b311c5cbSDmitry Torokhov { "cs", "gpios", "fsl,spi" }, 526b311c5cbSDmitry Torokhov { "cs", "gpios", "aeroflexgaisler,spictrl" }, 527307c593bSDmitry Torokhov #endif 528307c593bSDmitry Torokhov #if IS_ENABLED(CONFIG_SPI_PPC4xx) 529b311c5cbSDmitry Torokhov { "cs", "gpios", "ibm,ppc4xx-spi" }, 530b311c5cbSDmitry Torokhov #endif 531307c593bSDmitry Torokhov 532b311c5cbSDmitry Torokhov #if IS_ENABLED(CONFIG_TYPEC_FUSB302) 533e3023bf8SLinus Walleij /* 534b311c5cbSDmitry Torokhov * Fairchild FUSB302 host is using undocumented "fcs,int_n" 535b311c5cbSDmitry Torokhov * property without the compulsory "-gpios" suffix. 536e3023bf8SLinus Walleij */ 537b311c5cbSDmitry Torokhov { "fcs,int_n", NULL, "fcs,fusb302" }, 538b311c5cbSDmitry Torokhov #endif 5396a537d48SLinus Walleij }; 540b311c5cbSDmitry Torokhov struct gpio_desc *desc; 541b311c5cbSDmitry Torokhov const char *legacy_id; 542b311c5cbSDmitry Torokhov unsigned int i; 5436a537d48SLinus Walleij 5446a537d48SLinus Walleij if (!con_id) 5456a537d48SLinus Walleij return ERR_PTR(-ENOENT); 5466a537d48SLinus Walleij 547b311c5cbSDmitry Torokhov for (i = 0; i < ARRAY_SIZE(gpios); i++) { 548b311c5cbSDmitry Torokhov if (strcmp(con_id, gpios[i].con_id)) 549b311c5cbSDmitry Torokhov continue; 5506a537d48SLinus Walleij 551b311c5cbSDmitry Torokhov if (gpios[i].compatible && 552b311c5cbSDmitry Torokhov !of_device_is_compatible(np, gpios[i].compatible)) 553b311c5cbSDmitry Torokhov continue; 554b311c5cbSDmitry Torokhov 555b311c5cbSDmitry Torokhov legacy_id = gpios[i].legacy_id ?: gpios[i].con_id; 556b311c5cbSDmitry Torokhov desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags); 557b311c5cbSDmitry Torokhov if (!gpiod_not_found(desc)) { 558b311c5cbSDmitry Torokhov pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n", 559b311c5cbSDmitry Torokhov of_node_full_name(np), legacy_id, con_id); 560b311c5cbSDmitry Torokhov return desc; 561b311c5cbSDmitry Torokhov } 5626a537d48SLinus Walleij } 5636a537d48SLinus Walleij 56411c43bb0SDmitry Torokhov return ERR_PTR(-ENOENT); 5656e24826dSLinus Walleij } 5666e24826dSLinus Walleij 567326c3753SDmitry Torokhov static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np, 568326c3753SDmitry Torokhov const char *con_id, 569326c3753SDmitry Torokhov unsigned int idx, 570326c3753SDmitry Torokhov enum of_gpio_flags *of_flags) 571326c3753SDmitry Torokhov { 572326c3753SDmitry Torokhov struct gpio_desc *desc; 573326c3753SDmitry Torokhov const char *legacy_id; 574326c3753SDmitry Torokhov 575326c3753SDmitry Torokhov if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)) 576326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 577326c3753SDmitry Torokhov 578326c3753SDmitry Torokhov if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine")) 579326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 580326c3753SDmitry Torokhov 581326c3753SDmitry Torokhov if (!con_id || strcmp(con_id, "i2s1-in-sel")) 582326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 583326c3753SDmitry Torokhov 584326c3753SDmitry Torokhov if (idx == 0) 585326c3753SDmitry Torokhov legacy_id = "i2s1-in-sel-gpio1"; 586326c3753SDmitry Torokhov else if (idx == 1) 587326c3753SDmitry Torokhov legacy_id = "i2s1-in-sel-gpio2"; 588326c3753SDmitry Torokhov else 589326c3753SDmitry Torokhov return ERR_PTR(-ENOENT); 590326c3753SDmitry Torokhov 591326c3753SDmitry Torokhov desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags); 592326c3753SDmitry Torokhov if (!gpiod_not_found(desc)) 593326c3753SDmitry Torokhov pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n", 594326c3753SDmitry Torokhov of_node_full_name(np), legacy_id, con_id); 595326c3753SDmitry Torokhov 596326c3753SDmitry Torokhov return desc; 597326c3753SDmitry Torokhov } 598326c3753SDmitry Torokhov 599a2b5e207SDmitry Torokhov typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, 600a2b5e207SDmitry Torokhov const char *con_id, 601a2b5e207SDmitry Torokhov unsigned int idx, 602a2b5e207SDmitry Torokhov enum of_gpio_flags *of_flags); 603a2b5e207SDmitry Torokhov static const of_find_gpio_quirk of_find_gpio_quirks[] = { 604b311c5cbSDmitry Torokhov of_find_gpio_rename, 605326c3753SDmitry Torokhov of_find_mt2701_gpio, 6068b10ca2fSMichael Walle NULL 607a2b5e207SDmitry Torokhov }; 608a2b5e207SDmitry Torokhov 609ea713bc4SLinus Walleij struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, 610fed7026aSAndy Shevchenko unsigned int idx, unsigned long *flags) 611ea713bc4SLinus Walleij { 612ea713bc4SLinus Walleij char prop_name[32]; /* 32 is max size of property name */ 613ea713bc4SLinus Walleij enum of_gpio_flags of_flags; 614a2b5e207SDmitry Torokhov const of_find_gpio_quirk *q; 615ea713bc4SLinus Walleij struct gpio_desc *desc; 616ea713bc4SLinus Walleij unsigned int i; 617ea713bc4SLinus Walleij 618c8582339SLinus Walleij /* Try GPIO property "foo-gpios" and "foo-gpio" */ 619ea713bc4SLinus Walleij for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { 620ea713bc4SLinus Walleij if (con_id) 621ea713bc4SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, 622ea713bc4SLinus Walleij gpio_suffixes[i]); 623ea713bc4SLinus Walleij else 624ea713bc4SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s", 625ea713bc4SLinus Walleij gpio_suffixes[i]); 626ea713bc4SLinus Walleij 627ea713bc4SLinus Walleij desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, 628ea713bc4SLinus Walleij &of_flags); 6296662ae6aSMaxime Ripard 6307b58696dSAndy Shevchenko if (!gpiod_not_found(desc)) 631ea713bc4SLinus Walleij break; 632ea713bc4SLinus Walleij } 633ea713bc4SLinus Walleij 634a2b5e207SDmitry Torokhov /* Properly named GPIO was not found, try workarounds */ 635a2b5e207SDmitry Torokhov for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) 636a2b5e207SDmitry Torokhov desc = (*q)(dev->of_node, con_id, idx, &of_flags); 6376e24826dSLinus Walleij 638ea713bc4SLinus Walleij if (IS_ERR(desc)) 639ea713bc4SLinus Walleij return desc; 640ea713bc4SLinus Walleij 641d9e7f0e3SDmitry Torokhov *flags = of_convert_gpio_flags(of_flags); 642d449991cSThomas Petazzoni 643ea713bc4SLinus Walleij return desc; 644ea713bc4SLinus Walleij } 645ea713bc4SLinus Walleij 646f141ed65SGrant Likely /** 647fd7337fdSMarkus Pargmann * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API 648f625d460SBenoit Parrot * @np: device node to get GPIO from 649be715343SMasahiro Yamada * @chip: GPIO chip whose hog is parsed 650a79fead5SGeert Uytterhoeven * @idx: Index of the GPIO to parse 651f625d460SBenoit Parrot * @name: GPIO line name 652fed7026aSAndy Shevchenko * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from 653fed7026aSAndy Shevchenko * of_find_gpio() or of_parse_own_gpio() 654f625d460SBenoit Parrot * @dflags: gpiod_flags - optional GPIO initialization flags 655f625d460SBenoit Parrot * 656f625d460SBenoit Parrot * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno 657f625d460SBenoit Parrot * value on the error condition. 658f625d460SBenoit Parrot */ 659fd7337fdSMarkus Pargmann static struct gpio_desc *of_parse_own_gpio(struct device_node *np, 660be715343SMasahiro Yamada struct gpio_chip *chip, 661a79fead5SGeert Uytterhoeven unsigned int idx, const char **name, 662fed7026aSAndy Shevchenko unsigned long *lflags, 663f625d460SBenoit Parrot enum gpiod_flags *dflags) 664f625d460SBenoit Parrot { 665f625d460SBenoit Parrot struct device_node *chip_np; 666f625d460SBenoit Parrot enum of_gpio_flags xlate_flags; 667be715343SMasahiro Yamada struct of_phandle_args gpiospec; 668be715343SMasahiro Yamada struct gpio_desc *desc; 669a79fead5SGeert Uytterhoeven unsigned int i; 670f625d460SBenoit Parrot u32 tmp; 6713f9547e1SMasahiro Yamada int ret; 672f625d460SBenoit Parrot 673be715343SMasahiro Yamada chip_np = chip->of_node; 674f625d460SBenoit Parrot if (!chip_np) 675f625d460SBenoit Parrot return ERR_PTR(-EINVAL); 676f625d460SBenoit Parrot 677f625d460SBenoit Parrot xlate_flags = 0; 6782d6c06f5SAndy Shevchenko *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 67940941954SAndy Shevchenko *dflags = GPIOD_ASIS; 680f625d460SBenoit Parrot 681f625d460SBenoit Parrot ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); 682f625d460SBenoit Parrot if (ret) 683f625d460SBenoit Parrot return ERR_PTR(ret); 684f625d460SBenoit Parrot 685be715343SMasahiro Yamada gpiospec.np = chip_np; 686be715343SMasahiro Yamada gpiospec.args_count = tmp; 687f625d460SBenoit Parrot 688a79fead5SGeert Uytterhoeven for (i = 0; i < tmp; i++) { 689a79fead5SGeert Uytterhoeven ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, 690a79fead5SGeert Uytterhoeven &gpiospec.args[i]); 691f625d460SBenoit Parrot if (ret) 692f625d460SBenoit Parrot return ERR_PTR(ret); 693a79fead5SGeert Uytterhoeven } 694f625d460SBenoit Parrot 69599468c1aSMasahiro Yamada desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); 696be715343SMasahiro Yamada if (IS_ERR(desc)) 697be715343SMasahiro Yamada return desc; 698f625d460SBenoit Parrot 699d9e7f0e3SDmitry Torokhov *lflags = of_convert_gpio_flags(xlate_flags); 700f625d460SBenoit Parrot 701f625d460SBenoit Parrot if (of_property_read_bool(np, "input")) 702f625d460SBenoit Parrot *dflags |= GPIOD_IN; 703f625d460SBenoit Parrot else if (of_property_read_bool(np, "output-low")) 704f625d460SBenoit Parrot *dflags |= GPIOD_OUT_LOW; 705f625d460SBenoit Parrot else if (of_property_read_bool(np, "output-high")) 706f625d460SBenoit Parrot *dflags |= GPIOD_OUT_HIGH; 707f625d460SBenoit Parrot else { 70862cdcb6cSRob Herring pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", 70962cdcb6cSRob Herring desc_to_gpio(desc), np); 710f625d460SBenoit Parrot return ERR_PTR(-EINVAL); 711f625d460SBenoit Parrot } 712f625d460SBenoit Parrot 713f625d460SBenoit Parrot if (name && of_property_read_string(np, "line-name", name)) 714f625d460SBenoit Parrot *name = np->name; 715f625d460SBenoit Parrot 716be715343SMasahiro Yamada return desc; 717f625d460SBenoit Parrot } 718f625d460SBenoit Parrot 719f625d460SBenoit Parrot /** 720bc21077eSGeert Uytterhoeven * of_gpiochip_add_hog - Add all hogs in a hog device node 721bc21077eSGeert Uytterhoeven * @chip: gpio chip to act on 722bc21077eSGeert Uytterhoeven * @hog: device node describing the hogs 723bc21077eSGeert Uytterhoeven * 724bc21077eSGeert Uytterhoeven * Returns error if it fails otherwise 0 on success. 725bc21077eSGeert Uytterhoeven */ 726bc21077eSGeert Uytterhoeven static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) 727bc21077eSGeert Uytterhoeven { 728bc21077eSGeert Uytterhoeven enum gpiod_flags dflags; 729bc21077eSGeert Uytterhoeven struct gpio_desc *desc; 730bc21077eSGeert Uytterhoeven unsigned long lflags; 731bc21077eSGeert Uytterhoeven const char *name; 732bc21077eSGeert Uytterhoeven unsigned int i; 733bc21077eSGeert Uytterhoeven int ret; 734bc21077eSGeert Uytterhoeven 735bc21077eSGeert Uytterhoeven for (i = 0;; i++) { 736bc21077eSGeert Uytterhoeven desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); 737bc21077eSGeert Uytterhoeven if (IS_ERR(desc)) 738bc21077eSGeert Uytterhoeven break; 739bc21077eSGeert Uytterhoeven 740bc21077eSGeert Uytterhoeven ret = gpiod_hog(desc, name, lflags, dflags); 741bc21077eSGeert Uytterhoeven if (ret < 0) 742bc21077eSGeert Uytterhoeven return ret; 74363636d95SGeert Uytterhoeven 74463636d95SGeert Uytterhoeven #ifdef CONFIG_OF_DYNAMIC 74563636d95SGeert Uytterhoeven desc->hog = hog; 74663636d95SGeert Uytterhoeven #endif 747bc21077eSGeert Uytterhoeven } 748bc21077eSGeert Uytterhoeven 749bc21077eSGeert Uytterhoeven return 0; 750bc21077eSGeert Uytterhoeven } 751bc21077eSGeert Uytterhoeven 752bc21077eSGeert Uytterhoeven /** 753fd7337fdSMarkus Pargmann * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions 754f625d460SBenoit Parrot * @chip: gpio chip to act on 755f625d460SBenoit Parrot * 756f625d460SBenoit Parrot * This is only used by of_gpiochip_add to request/set GPIO initial 757f625d460SBenoit Parrot * configuration. 758ead066e6SGeert Uytterhoeven * It returns error if it fails otherwise 0 on success. 759f625d460SBenoit Parrot */ 760dfbd379bSLaxman Dewangan static int of_gpiochip_scan_gpios(struct gpio_chip *chip) 761f625d460SBenoit Parrot { 762f625d460SBenoit Parrot struct device_node *np; 763dfbd379bSLaxman Dewangan int ret; 764f625d460SBenoit Parrot 765d1279d94SLaxman Dewangan for_each_available_child_of_node(chip->of_node, np) { 766f625d460SBenoit Parrot if (!of_property_read_bool(np, "gpio-hog")) 767f625d460SBenoit Parrot continue; 768f625d460SBenoit Parrot 769bc21077eSGeert Uytterhoeven ret = of_gpiochip_add_hog(chip, np); 77009e258afSWei Yongjun if (ret < 0) { 77109e258afSWei Yongjun of_node_put(np); 772dfbd379bSLaxman Dewangan return ret; 773f625d460SBenoit Parrot } 77463636d95SGeert Uytterhoeven 77563636d95SGeert Uytterhoeven of_node_set_flag(np, OF_POPULATED); 77609e258afSWei Yongjun } 777dfbd379bSLaxman Dewangan 778dfbd379bSLaxman Dewangan return 0; 779f625d460SBenoit Parrot } 780f625d460SBenoit Parrot 78163636d95SGeert Uytterhoeven #ifdef CONFIG_OF_DYNAMIC 78263636d95SGeert Uytterhoeven /** 78363636d95SGeert Uytterhoeven * of_gpiochip_remove_hog - Remove all hogs in a hog device node 78463636d95SGeert Uytterhoeven * @chip: gpio chip to act on 78563636d95SGeert Uytterhoeven * @hog: device node describing the hogs 78663636d95SGeert Uytterhoeven */ 78763636d95SGeert Uytterhoeven static void of_gpiochip_remove_hog(struct gpio_chip *chip, 78863636d95SGeert Uytterhoeven struct device_node *hog) 78963636d95SGeert Uytterhoeven { 79080c78fbeSAndy Shevchenko struct gpio_desc *desc; 79163636d95SGeert Uytterhoeven 79257017eddSAndy Shevchenko for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED) 79380c78fbeSAndy Shevchenko if (desc->hog == hog) 79480c78fbeSAndy Shevchenko gpiochip_free_own_desc(desc); 79563636d95SGeert Uytterhoeven } 79663636d95SGeert Uytterhoeven 79763636d95SGeert Uytterhoeven static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) 79863636d95SGeert Uytterhoeven { 799597a8a88SAndy Shevchenko return device_match_of_node(&chip->gpiodev->dev, data); 80063636d95SGeert Uytterhoeven } 80163636d95SGeert Uytterhoeven 80263636d95SGeert Uytterhoeven static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) 80363636d95SGeert Uytterhoeven { 80463636d95SGeert Uytterhoeven return gpiochip_find(np, of_gpiochip_match_node); 80563636d95SGeert Uytterhoeven } 80663636d95SGeert Uytterhoeven 80763636d95SGeert Uytterhoeven static int of_gpio_notify(struct notifier_block *nb, unsigned long action, 80863636d95SGeert Uytterhoeven void *arg) 80963636d95SGeert Uytterhoeven { 81063636d95SGeert Uytterhoeven struct of_reconfig_data *rd = arg; 81163636d95SGeert Uytterhoeven struct gpio_chip *chip; 81263636d95SGeert Uytterhoeven int ret; 81363636d95SGeert Uytterhoeven 81463636d95SGeert Uytterhoeven /* 81563636d95SGeert Uytterhoeven * This only supports adding and removing complete gpio-hog nodes. 81663636d95SGeert Uytterhoeven * Modifying an existing gpio-hog node is not supported (except for 81763636d95SGeert Uytterhoeven * changing its "status" property, which is treated the same as 81863636d95SGeert Uytterhoeven * addition/removal). 81963636d95SGeert Uytterhoeven */ 82063636d95SGeert Uytterhoeven switch (of_reconfig_get_state_change(action, arg)) { 82163636d95SGeert Uytterhoeven case OF_RECONFIG_CHANGE_ADD: 82263636d95SGeert Uytterhoeven if (!of_property_read_bool(rd->dn, "gpio-hog")) 82363636d95SGeert Uytterhoeven return NOTIFY_OK; /* not for us */ 82463636d95SGeert Uytterhoeven 82563636d95SGeert Uytterhoeven if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) 82663636d95SGeert Uytterhoeven return NOTIFY_OK; 82763636d95SGeert Uytterhoeven 82863636d95SGeert Uytterhoeven chip = of_find_gpiochip_by_node(rd->dn->parent); 82963636d95SGeert Uytterhoeven if (chip == NULL) 83063636d95SGeert Uytterhoeven return NOTIFY_OK; /* not for us */ 83163636d95SGeert Uytterhoeven 83263636d95SGeert Uytterhoeven ret = of_gpiochip_add_hog(chip, rd->dn); 83363636d95SGeert Uytterhoeven if (ret < 0) { 83463636d95SGeert Uytterhoeven pr_err("%s: failed to add hogs for %pOF\n", __func__, 83563636d95SGeert Uytterhoeven rd->dn); 83663636d95SGeert Uytterhoeven of_node_clear_flag(rd->dn, OF_POPULATED); 83763636d95SGeert Uytterhoeven return notifier_from_errno(ret); 83863636d95SGeert Uytterhoeven } 83963636d95SGeert Uytterhoeven break; 84063636d95SGeert Uytterhoeven 84163636d95SGeert Uytterhoeven case OF_RECONFIG_CHANGE_REMOVE: 84263636d95SGeert Uytterhoeven if (!of_node_check_flag(rd->dn, OF_POPULATED)) 84363636d95SGeert Uytterhoeven return NOTIFY_OK; /* already depopulated */ 84463636d95SGeert Uytterhoeven 84563636d95SGeert Uytterhoeven chip = of_find_gpiochip_by_node(rd->dn->parent); 84663636d95SGeert Uytterhoeven if (chip == NULL) 84763636d95SGeert Uytterhoeven return NOTIFY_OK; /* not for us */ 84863636d95SGeert Uytterhoeven 84963636d95SGeert Uytterhoeven of_gpiochip_remove_hog(chip, rd->dn); 85063636d95SGeert Uytterhoeven of_node_clear_flag(rd->dn, OF_POPULATED); 85163636d95SGeert Uytterhoeven break; 85263636d95SGeert Uytterhoeven } 85363636d95SGeert Uytterhoeven 85463636d95SGeert Uytterhoeven return NOTIFY_OK; 85563636d95SGeert Uytterhoeven } 85663636d95SGeert Uytterhoeven 85763636d95SGeert Uytterhoeven struct notifier_block gpio_of_notifier = { 85863636d95SGeert Uytterhoeven .notifier_call = of_gpio_notify, 85963636d95SGeert Uytterhoeven }; 86063636d95SGeert Uytterhoeven #endif /* CONFIG_OF_DYNAMIC */ 86163636d95SGeert Uytterhoeven 862f625d460SBenoit Parrot /** 86367049c50SThierry Reding * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags 864f141ed65SGrant Likely * @gc: pointer to the gpio_chip structure 86567049c50SThierry Reding * @gpiospec: GPIO specifier as found in the device tree 866f141ed65SGrant Likely * @flags: a flags pointer to fill in 867f141ed65SGrant Likely * 868f141ed65SGrant Likely * This is simple translation function, suitable for the most 1:1 mapped 86967049c50SThierry Reding * GPIO chips. This function performs only one sanity check: whether GPIO 870f141ed65SGrant Likely * is less than ngpios (that is specified in the gpio_chip). 871f141ed65SGrant Likely */ 872b0c7e73bSGeert Uytterhoeven static int of_gpio_simple_xlate(struct gpio_chip *gc, 873b0c7e73bSGeert Uytterhoeven const struct of_phandle_args *gpiospec, 874b0c7e73bSGeert Uytterhoeven u32 *flags) 875f141ed65SGrant Likely { 876f141ed65SGrant Likely /* 877f141ed65SGrant Likely * We're discouraging gpio_cells < 2, since that way you'll have to 87820a8a968SColin Cronin * write your own xlate function (that will have to retrieve the GPIO 879f141ed65SGrant Likely * number and the flags from a single gpio cell -- this is possible, 880f141ed65SGrant Likely * but not recommended). 881f141ed65SGrant Likely */ 882f141ed65SGrant Likely if (gc->of_gpio_n_cells < 2) { 883f141ed65SGrant Likely WARN_ON(1); 884f141ed65SGrant Likely return -EINVAL; 885f141ed65SGrant Likely } 886f141ed65SGrant Likely 887f141ed65SGrant Likely if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) 888f141ed65SGrant Likely return -EINVAL; 889f141ed65SGrant Likely 8907b96c686SGrant Likely if (gpiospec->args[0] >= gc->ngpio) 891f141ed65SGrant Likely return -EINVAL; 892f141ed65SGrant Likely 893f141ed65SGrant Likely if (flags) 894f141ed65SGrant Likely *flags = gpiospec->args[1]; 895f141ed65SGrant Likely 896f141ed65SGrant Likely return gpiospec->args[0]; 897f141ed65SGrant Likely } 898f141ed65SGrant Likely 899f141ed65SGrant Likely /** 9003208b0f0SLinus Walleij * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) 901f141ed65SGrant Likely * @np: device node of the GPIO chip 902f141ed65SGrant Likely * @mm_gc: pointer to the of_mm_gpio_chip allocated structure 9033208b0f0SLinus Walleij * @data: driver data to store in the struct gpio_chip 904f141ed65SGrant Likely * 905f141ed65SGrant Likely * To use this function you should allocate and fill mm_gc with: 906f141ed65SGrant Likely * 907f141ed65SGrant Likely * 1) In the gpio_chip structure: 908f141ed65SGrant Likely * - all the callbacks 909f141ed65SGrant Likely * - of_gpio_n_cells 910f141ed65SGrant Likely * - of_xlate callback (optional) 911f141ed65SGrant Likely * 912f141ed65SGrant Likely * 3) In the of_mm_gpio_chip structure: 913f141ed65SGrant Likely * - save_regs callback (optional) 914f141ed65SGrant Likely * 915f141ed65SGrant Likely * If succeeded, this function will map bank's memory and will 916f141ed65SGrant Likely * do all necessary work for you. Then you'll able to use .regs 917f141ed65SGrant Likely * to manage GPIOs from the callbacks. 918f141ed65SGrant Likely */ 9193208b0f0SLinus Walleij int of_mm_gpiochip_add_data(struct device_node *np, 9203208b0f0SLinus Walleij struct of_mm_gpio_chip *mm_gc, 9213208b0f0SLinus Walleij void *data) 922f141ed65SGrant Likely { 923f141ed65SGrant Likely int ret = -ENOMEM; 924f141ed65SGrant Likely struct gpio_chip *gc = &mm_gc->gc; 925f141ed65SGrant Likely 9267eb6ce2fSRob Herring gc->label = kasprintf(GFP_KERNEL, "%pOF", np); 927f141ed65SGrant Likely if (!gc->label) 928f141ed65SGrant Likely goto err0; 929f141ed65SGrant Likely 930f141ed65SGrant Likely mm_gc->regs = of_iomap(np, 0); 931f141ed65SGrant Likely if (!mm_gc->regs) 932f141ed65SGrant Likely goto err1; 933f141ed65SGrant Likely 934f141ed65SGrant Likely gc->base = -1; 935f141ed65SGrant Likely 936f141ed65SGrant Likely if (mm_gc->save_regs) 937f141ed65SGrant Likely mm_gc->save_regs(mm_gc); 938f141ed65SGrant Likely 9395d07a692SLiang He of_node_put(mm_gc->gc.of_node); 9405d07a692SLiang He mm_gc->gc.of_node = of_node_get(np); 941f141ed65SGrant Likely 9423208b0f0SLinus Walleij ret = gpiochip_add_data(gc, data); 943f141ed65SGrant Likely if (ret) 944f141ed65SGrant Likely goto err2; 945f141ed65SGrant Likely 946f141ed65SGrant Likely return 0; 947f141ed65SGrant Likely err2: 9485d07a692SLiang He of_node_put(np); 949f141ed65SGrant Likely iounmap(mm_gc->regs); 950f141ed65SGrant Likely err1: 951f141ed65SGrant Likely kfree(gc->label); 952f141ed65SGrant Likely err0: 9537eb6ce2fSRob Herring pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); 954f141ed65SGrant Likely return ret; 955f141ed65SGrant Likely } 9566d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data); 957f141ed65SGrant Likely 958d621e8baSRicardo Ribalda Delgado /** 959d621e8baSRicardo Ribalda Delgado * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) 960d621e8baSRicardo Ribalda Delgado * @mm_gc: pointer to the of_mm_gpio_chip allocated structure 961d621e8baSRicardo Ribalda Delgado */ 962d621e8baSRicardo Ribalda Delgado void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) 963d621e8baSRicardo Ribalda Delgado { 964d621e8baSRicardo Ribalda Delgado struct gpio_chip *gc = &mm_gc->gc; 965d621e8baSRicardo Ribalda Delgado 966d621e8baSRicardo Ribalda Delgado if (!mm_gc) 967d621e8baSRicardo Ribalda Delgado return; 968d621e8baSRicardo Ribalda Delgado 969d621e8baSRicardo Ribalda Delgado gpiochip_remove(gc); 970d621e8baSRicardo Ribalda Delgado iounmap(mm_gc->regs); 971d621e8baSRicardo Ribalda Delgado kfree(gc->label); 972d621e8baSRicardo Ribalda Delgado } 9736d662455SGeert Uytterhoeven EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); 974d621e8baSRicardo Ribalda Delgado 975726cb3baSStephen Boyd static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) 976726cb3baSStephen Boyd { 977726cb3baSStephen Boyd int len, i; 978726cb3baSStephen Boyd u32 start, count; 979726cb3baSStephen Boyd struct device_node *np = chip->of_node; 980726cb3baSStephen Boyd 981726cb3baSStephen Boyd len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); 982726cb3baSStephen Boyd if (len < 0 || len % 2 != 0) 983726cb3baSStephen Boyd return; 984726cb3baSStephen Boyd 985726cb3baSStephen Boyd for (i = 0; i < len; i += 2) { 986726cb3baSStephen Boyd of_property_read_u32_index(np, "gpio-reserved-ranges", 987726cb3baSStephen Boyd i, &start); 988726cb3baSStephen Boyd of_property_read_u32_index(np, "gpio-reserved-ranges", 989726cb3baSStephen Boyd i + 1, &count); 990e75f88efSAndrei Lalaev if (start >= chip->ngpio || start + count > chip->ngpio) 991726cb3baSStephen Boyd continue; 992726cb3baSStephen Boyd 993726cb3baSStephen Boyd bitmap_clear(chip->valid_mask, start, count); 994726cb3baSStephen Boyd } 995726cb3baSStephen Boyd }; 996726cb3baSStephen Boyd 997f23f1516SShiraz Hashim #ifdef CONFIG_PINCTRL 99828355f81STomeu Vizoso static int of_gpiochip_add_pin_range(struct gpio_chip *chip) 999f23f1516SShiraz Hashim { 1000f23f1516SShiraz Hashim struct device_node *np = chip->of_node; 1001f23f1516SShiraz Hashim struct of_phandle_args pinspec; 10021e63d7b9SLinus Walleij struct pinctrl_dev *pctldev; 1003f23f1516SShiraz Hashim int index = 0, ret; 1004586a87e6SChristian Ruppert const char *name; 1005586a87e6SChristian Ruppert static const char group_names_propname[] = "gpio-ranges-group-names"; 1006586a87e6SChristian Ruppert struct property *group_names; 1007f23f1516SShiraz Hashim 1008f23f1516SShiraz Hashim if (!np) 100928355f81STomeu Vizoso return 0; 1010f23f1516SShiraz Hashim 10113550bba2SStefan Wahren if (!of_property_read_bool(np, "gpio-ranges") && 10123550bba2SStefan Wahren chip->of_gpio_ranges_fallback) { 10133550bba2SStefan Wahren return chip->of_gpio_ranges_fallback(chip, np); 10143550bba2SStefan Wahren } 10153550bba2SStefan Wahren 1016586a87e6SChristian Ruppert group_names = of_find_property(np, group_names_propname, NULL); 1017586a87e6SChristian Ruppert 1018ad4e1a7cSHaojian Zhuang for (;; index++) { 1019d9fe0039SStephen Warren ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 1020d9fe0039SStephen Warren index, &pinspec); 1021f23f1516SShiraz Hashim if (ret) 1022f23f1516SShiraz Hashim break; 1023f23f1516SShiraz Hashim 10241e63d7b9SLinus Walleij pctldev = of_pinctrl_get(pinspec.np); 1025602cf638SMasahiro Yamada of_node_put(pinspec.np); 10261e63d7b9SLinus Walleij if (!pctldev) 102728355f81STomeu Vizoso return -EPROBE_DEFER; 1028f23f1516SShiraz Hashim 1029586a87e6SChristian Ruppert if (pinspec.args[2]) { 1030586a87e6SChristian Ruppert if (group_names) { 103172858602SLaurent Navet of_property_read_string_index(np, 1032586a87e6SChristian Ruppert group_names_propname, 1033586a87e6SChristian Ruppert index, &name); 1034586a87e6SChristian Ruppert if (strlen(name)) { 10357eb6ce2fSRob Herring pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", 10367eb6ce2fSRob Herring np); 1037586a87e6SChristian Ruppert break; 1038586a87e6SChristian Ruppert } 1039586a87e6SChristian Ruppert } 1040586a87e6SChristian Ruppert /* npins != 0: linear range */ 10411e63d7b9SLinus Walleij ret = gpiochip_add_pin_range(chip, 1042ef5e3eefSHaojian Zhuang pinctrl_dev_get_devname(pctldev), 10431e63d7b9SLinus Walleij pinspec.args[0], 104486853c83SHaojian Zhuang pinspec.args[1], 104586853c83SHaojian Zhuang pinspec.args[2]); 10461e63d7b9SLinus Walleij if (ret) 104728355f81STomeu Vizoso return ret; 1048586a87e6SChristian Ruppert } else { 1049586a87e6SChristian Ruppert /* npins == 0: special range */ 1050586a87e6SChristian Ruppert if (pinspec.args[1]) { 10517eb6ce2fSRob Herring pr_err("%pOF: Illegal gpio-range format.\n", 10527eb6ce2fSRob Herring np); 1053586a87e6SChristian Ruppert break; 1054586a87e6SChristian Ruppert } 1055586a87e6SChristian Ruppert 1056586a87e6SChristian Ruppert if (!group_names) { 10577eb6ce2fSRob Herring pr_err("%pOF: GPIO group range requested but no %s property.\n", 10587eb6ce2fSRob Herring np, group_names_propname); 1059586a87e6SChristian Ruppert break; 1060586a87e6SChristian Ruppert } 1061586a87e6SChristian Ruppert 1062586a87e6SChristian Ruppert ret = of_property_read_string_index(np, 1063586a87e6SChristian Ruppert group_names_propname, 1064586a87e6SChristian Ruppert index, &name); 1065586a87e6SChristian Ruppert if (ret) 1066586a87e6SChristian Ruppert break; 1067586a87e6SChristian Ruppert 1068586a87e6SChristian Ruppert if (!strlen(name)) { 10697eb6ce2fSRob Herring pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", 10707eb6ce2fSRob Herring np); 1071586a87e6SChristian Ruppert break; 1072586a87e6SChristian Ruppert } 1073586a87e6SChristian Ruppert 1074586a87e6SChristian Ruppert ret = gpiochip_add_pingroup_range(chip, pctldev, 1075586a87e6SChristian Ruppert pinspec.args[0], name); 1076586a87e6SChristian Ruppert if (ret) 107728355f81STomeu Vizoso return ret; 1078586a87e6SChristian Ruppert } 1079ad4e1a7cSHaojian Zhuang } 108028355f81STomeu Vizoso 108128355f81STomeu Vizoso return 0; 1082f23f1516SShiraz Hashim } 1083f23f1516SShiraz Hashim 1084f23f1516SShiraz Hashim #else 108528355f81STomeu Vizoso static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } 1086f23f1516SShiraz Hashim #endif 1087f23f1516SShiraz Hashim 108828355f81STomeu Vizoso int of_gpiochip_add(struct gpio_chip *chip) 1089f141ed65SGrant Likely { 1090f0d1ab05SLinus Walleij int ret; 109128355f81STomeu Vizoso 1092f141ed65SGrant Likely if (!chip->of_node) 109328355f81STomeu Vizoso return 0; 1094f141ed65SGrant Likely 1095f141ed65SGrant Likely if (!chip->of_xlate) { 1096f141ed65SGrant Likely chip->of_gpio_n_cells = 2; 1097f141ed65SGrant Likely chip->of_xlate = of_gpio_simple_xlate; 1098f141ed65SGrant Likely } 1099f141ed65SGrant Likely 11001020dfd1SMasahiro Yamada if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) 11011020dfd1SMasahiro Yamada return -EINVAL; 11021020dfd1SMasahiro Yamada 1103726cb3baSStephen Boyd of_gpiochip_init_valid_mask(chip); 1104726cb3baSStephen Boyd 1105f0d1ab05SLinus Walleij ret = of_gpiochip_add_pin_range(chip); 1106f0d1ab05SLinus Walleij if (ret) 1107f0d1ab05SLinus Walleij return ret; 110828355f81STomeu Vizoso 1109f141ed65SGrant Likely of_node_get(chip->of_node); 1110f625d460SBenoit Parrot 1111f0d1ab05SLinus Walleij ret = of_gpiochip_scan_gpios(chip); 11122f4133bbSAndy Shevchenko if (ret) 1113f7299d44SGeert Uytterhoeven of_node_put(chip->of_node); 1114f7299d44SGeert Uytterhoeven 1115f0d1ab05SLinus Walleij return ret; 1116f141ed65SGrant Likely } 1117f141ed65SGrant Likely 1118f141ed65SGrant Likely void of_gpiochip_remove(struct gpio_chip *chip) 1119f141ed65SGrant Likely { 1120f141ed65SGrant Likely of_node_put(chip->of_node); 1121f141ed65SGrant Likely } 11224731210cSSaravana Kannan 11234731210cSSaravana Kannan void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) 11244731210cSSaravana Kannan { 11251df62542SAndy Shevchenko /* Set default OF node to parent's one if present */ 11261df62542SAndy Shevchenko if (gc->parent) 11271df62542SAndy Shevchenko gdev->dev.of_node = gc->parent->of_node; 11281df62542SAndy Shevchenko 1129ac627260SBartosz Golaszewski if (gc->fwnode) 1130ac627260SBartosz Golaszewski gc->of_node = to_of_node(gc->fwnode); 1131ac627260SBartosz Golaszewski 11324731210cSSaravana Kannan /* If the gpiochip has an assigned OF node this takes precedence */ 11334731210cSSaravana Kannan if (gc->of_node) 11344731210cSSaravana Kannan gdev->dev.of_node = gc->of_node; 11354731210cSSaravana Kannan else 11364731210cSSaravana Kannan gc->of_node = gdev->dev.of_node; 11374731210cSSaravana Kannan } 1138