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" 24af8b6375SAlexandre Courbot 25c7e9d398SMasahiro Yamada static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) 263d0f7cf0SGrant Likely { 27c7e9d398SMasahiro Yamada struct of_phandle_args *gpiospec = data; 28c7e9d398SMasahiro Yamada 29c7e9d398SMasahiro Yamada return chip->gpiodev->dev.of_node == gpiospec->np && 30d49b48f0SVincent Whitchurch chip->of_xlate && 31c7e9d398SMasahiro Yamada chip->of_xlate(chip, gpiospec, NULL) >= 0; 327b8792bbSHans Holmberg } 333d0f7cf0SGrant Likely 34c7e9d398SMasahiro Yamada static struct gpio_chip *of_find_gpiochip_by_xlate( 35c7e9d398SMasahiro Yamada struct of_phandle_args *gpiospec) 36762c2e46SMasahiro Yamada { 37c7e9d398SMasahiro Yamada return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate); 383d0f7cf0SGrant Likely } 393d0f7cf0SGrant Likely 4099468c1aSMasahiro Yamada static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, 4199468c1aSMasahiro Yamada struct of_phandle_args *gpiospec, 4299468c1aSMasahiro Yamada enum of_gpio_flags *flags) 4399468c1aSMasahiro Yamada { 4499468c1aSMasahiro Yamada int ret; 4599468c1aSMasahiro Yamada 4699468c1aSMasahiro Yamada if (chip->of_gpio_n_cells != gpiospec->args_count) 4799468c1aSMasahiro Yamada return ERR_PTR(-EINVAL); 4899468c1aSMasahiro Yamada 4999468c1aSMasahiro Yamada ret = chip->of_xlate(chip, gpiospec, flags); 5099468c1aSMasahiro Yamada if (ret < 0) 5199468c1aSMasahiro Yamada return ERR_PTR(ret); 5299468c1aSMasahiro Yamada 5399468c1aSMasahiro Yamada return gpiochip_get_desc(chip, ret); 54f141ed65SGrant Likely } 55f141ed65SGrant Likely 56a603a2b8SLinus Walleij static void of_gpio_flags_quirks(struct device_node *np, 5789a5e15bSLinus Walleij const char *propname, 586953c57aSLinus Walleij enum of_gpio_flags *flags, 596953c57aSLinus Walleij int index) 60a603a2b8SLinus Walleij { 61a603a2b8SLinus Walleij /* 6281c85ec1SLinus Walleij * Handle MMC "cd-inverted" and "wp-inverted" semantics. 6381c85ec1SLinus Walleij */ 6481c85ec1SLinus Walleij if (IS_ENABLED(CONFIG_MMC)) { 6581c85ec1SLinus Walleij /* 6681c85ec1SLinus Walleij * Active low is the default according to the 6789a5e15bSLinus Walleij * SDHCI specification and the device tree 6889a5e15bSLinus Walleij * bindings. However the code in the current 6989a5e15bSLinus Walleij * kernel was written such that the phandle 7089a5e15bSLinus Walleij * flags were always respected, and "cd-inverted" 7189a5e15bSLinus Walleij * would invert the flag from the device phandle. 7281c85ec1SLinus Walleij */ 7389a5e15bSLinus Walleij if (!strcmp(propname, "cd-gpios")) { 7489a5e15bSLinus Walleij if (of_property_read_bool(np, "cd-inverted")) 7589a5e15bSLinus Walleij *flags ^= OF_GPIO_ACTIVE_LOW; 7681c85ec1SLinus Walleij } 7789a5e15bSLinus Walleij if (!strcmp(propname, "wp-gpios")) { 7889a5e15bSLinus Walleij if (of_property_read_bool(np, "wp-inverted")) 7989a5e15bSLinus Walleij *flags ^= OF_GPIO_ACTIVE_LOW; 8081c85ec1SLinus Walleij } 8181c85ec1SLinus Walleij } 8281c85ec1SLinus Walleij /* 83a603a2b8SLinus Walleij * Some GPIO fixed regulator quirks. 84a603a2b8SLinus Walleij * Note that active low is the default. 85a603a2b8SLinus Walleij */ 86a603a2b8SLinus Walleij if (IS_ENABLED(CONFIG_REGULATOR) && 87906402a4SLinus Walleij (of_device_is_compatible(np, "regulator-fixed") || 88906402a4SLinus Walleij of_device_is_compatible(np, "reg-fixed-voltage") || 89a71a81e7SGeert Uytterhoeven (!(strcmp(propname, "enable-gpio") && 90a71a81e7SGeert Uytterhoeven strcmp(propname, "enable-gpios")) && 91a71a81e7SGeert Uytterhoeven of_device_is_compatible(np, "regulator-gpio")))) { 92a603a2b8SLinus Walleij /* 93a603a2b8SLinus Walleij * The regulator GPIO handles are specified such that the 94a603a2b8SLinus Walleij * presence or absence of "enable-active-high" solely controls 95a603a2b8SLinus Walleij * the polarity of the GPIO line. Any phandle flags must 96a603a2b8SLinus Walleij * be actively ignored. 97a603a2b8SLinus Walleij */ 98a603a2b8SLinus Walleij if (*flags & OF_GPIO_ACTIVE_LOW) { 99a603a2b8SLinus Walleij pr_warn("%s GPIO handle specifies active low - ignored\n", 100a603a2b8SLinus Walleij of_node_full_name(np)); 101a603a2b8SLinus Walleij *flags &= ~OF_GPIO_ACTIVE_LOW; 102a603a2b8SLinus Walleij } 103a603a2b8SLinus Walleij if (!of_property_read_bool(np, "enable-active-high")) 104a603a2b8SLinus Walleij *flags |= OF_GPIO_ACTIVE_LOW; 105a603a2b8SLinus Walleij } 106a603a2b8SLinus Walleij /* 107a603a2b8SLinus Walleij * Legacy open drain handling for fixed voltage regulators. 108a603a2b8SLinus Walleij */ 109a603a2b8SLinus Walleij if (IS_ENABLED(CONFIG_REGULATOR) && 110a603a2b8SLinus Walleij of_device_is_compatible(np, "reg-fixed-voltage") && 111a603a2b8SLinus Walleij of_property_read_bool(np, "gpio-open-drain")) { 112a603a2b8SLinus Walleij *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); 113a603a2b8SLinus Walleij pr_info("%s uses legacy open drain flag - update the DTS if you can\n", 114a603a2b8SLinus Walleij of_node_full_name(np)); 115a603a2b8SLinus Walleij } 1166953c57aSLinus Walleij 1176953c57aSLinus Walleij /* 1186953c57aSLinus Walleij * Legacy handling of SPI active high chip select. If we have a 1196953c57aSLinus Walleij * property named "cs-gpios" we need to inspect the child node 1206953c57aSLinus Walleij * to determine if the flags should have inverted semantics. 121fbbf145aSLinus Walleij * 122fbbf145aSLinus Walleij * This does not apply to an SPI device named "spi-gpio", because 123fbbf145aSLinus Walleij * these have traditionally obtained their own GPIOs by parsing 124fbbf145aSLinus Walleij * the device tree directly and did not respect any "spi-cs-high" 125fbbf145aSLinus Walleij * property on the SPI bus children. 1266953c57aSLinus Walleij */ 127fbbf145aSLinus Walleij if (IS_ENABLED(CONFIG_SPI_MASTER) && 128fbbf145aSLinus Walleij !strcmp(propname, "cs-gpios") && 129fbbf145aSLinus Walleij !of_device_is_compatible(np, "spi-gpio") && 130a71a81e7SGeert Uytterhoeven of_property_read_bool(np, "cs-gpios")) { 1316953c57aSLinus Walleij struct device_node *child; 1326953c57aSLinus Walleij u32 cs; 1336953c57aSLinus Walleij int ret; 1346953c57aSLinus Walleij 1356953c57aSLinus Walleij for_each_child_of_node(np, child) { 1366953c57aSLinus Walleij ret = of_property_read_u32(child, "reg", &cs); 137c1c04ceaSLinus Walleij if (ret) 1386953c57aSLinus Walleij continue; 1396953c57aSLinus Walleij if (cs == index) { 1406953c57aSLinus Walleij /* 1416953c57aSLinus Walleij * SPI children have active low chip selects 1426953c57aSLinus Walleij * by default. This can be specified negatively 1436953c57aSLinus Walleij * by just omitting "spi-cs-high" in the 1446953c57aSLinus Walleij * device node, or actively by tagging on 1456953c57aSLinus Walleij * GPIO_ACTIVE_LOW as flag in the device 1466953c57aSLinus Walleij * tree. If the line is simultaneously 1476953c57aSLinus Walleij * tagged as active low in the device tree 1486953c57aSLinus Walleij * and has the "spi-cs-high" set, we get a 1496953c57aSLinus Walleij * conflict and the "spi-cs-high" flag will 1506953c57aSLinus Walleij * take precedence. 1516953c57aSLinus Walleij */ 1527ce40277SAndrey Smirnov if (of_property_read_bool(child, "spi-cs-high")) { 1536953c57aSLinus Walleij if (*flags & OF_GPIO_ACTIVE_LOW) { 1546953c57aSLinus Walleij pr_warn("%s GPIO handle specifies active low - ignored\n", 1557ce40277SAndrey Smirnov of_node_full_name(child)); 1566953c57aSLinus Walleij *flags &= ~OF_GPIO_ACTIVE_LOW; 1576953c57aSLinus Walleij } 1586953c57aSLinus Walleij } else { 1596953c57aSLinus Walleij if (!(*flags & OF_GPIO_ACTIVE_LOW)) 1606953c57aSLinus Walleij pr_info("%s enforce active low on chipselect handle\n", 1617ce40277SAndrey Smirnov of_node_full_name(child)); 1626953c57aSLinus Walleij *flags |= OF_GPIO_ACTIVE_LOW; 1636953c57aSLinus Walleij } 16489fea04cSNishka Dasgupta of_node_put(child); 1656953c57aSLinus Walleij break; 1666953c57aSLinus Walleij } 1676953c57aSLinus Walleij } 1686953c57aSLinus Walleij } 169edc1ef3fSMartin Blumenstingl 170edc1ef3fSMartin Blumenstingl /* Legacy handling of stmmac's active-low PHY reset line */ 171edc1ef3fSMartin Blumenstingl if (IS_ENABLED(CONFIG_STMMAC_ETH) && 172edc1ef3fSMartin Blumenstingl !strcmp(propname, "snps,reset-gpio") && 173edc1ef3fSMartin Blumenstingl of_property_read_bool(np, "snps,reset-active-low")) 174edc1ef3fSMartin Blumenstingl *flags |= OF_GPIO_ACTIVE_LOW; 175a603a2b8SLinus Walleij } 176a603a2b8SLinus Walleij 177f141ed65SGrant Likely /** 178af8b6375SAlexandre Courbot * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API 179f141ed65SGrant Likely * @np: device node to get GPIO from 180f141ed65SGrant Likely * @propname: property name containing gpio specifier(s) 181f141ed65SGrant Likely * @index: index of the GPIO 182f141ed65SGrant Likely * @flags: a flags pointer to fill in 183f141ed65SGrant Likely * 184af8b6375SAlexandre Courbot * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno 185f141ed65SGrant Likely * value on the error condition. If @flags is not NULL the function also fills 186f141ed65SGrant Likely * in flags for the GPIO. 187f141ed65SGrant Likely */ 188af8b6375SAlexandre Courbot struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, 189af8b6375SAlexandre Courbot const char *propname, int index, enum of_gpio_flags *flags) 190f141ed65SGrant Likely { 191762c2e46SMasahiro Yamada struct of_phandle_args gpiospec; 192762c2e46SMasahiro Yamada struct gpio_chip *chip; 193762c2e46SMasahiro Yamada struct gpio_desc *desc; 194f141ed65SGrant Likely int ret; 195f141ed65SGrant Likely 196c11e6f0fSStephen Boyd ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, 197762c2e46SMasahiro Yamada &gpiospec); 1983d0f7cf0SGrant Likely if (ret) { 1997eb6ce2fSRob Herring pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", 2007eb6ce2fSRob Herring __func__, propname, np, index); 201af8b6375SAlexandre Courbot return ERR_PTR(ret); 2023d0f7cf0SGrant Likely } 203f141ed65SGrant Likely 204c7e9d398SMasahiro Yamada chip = of_find_gpiochip_by_xlate(&gpiospec); 205762c2e46SMasahiro Yamada if (!chip) { 206762c2e46SMasahiro Yamada desc = ERR_PTR(-EPROBE_DEFER); 207762c2e46SMasahiro Yamada goto out; 208762c2e46SMasahiro Yamada } 2093d0f7cf0SGrant Likely 21099468c1aSMasahiro Yamada desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); 211762c2e46SMasahiro Yamada if (IS_ERR(desc)) 212762c2e46SMasahiro Yamada goto out; 213762c2e46SMasahiro Yamada 214605f2d34SLinus Walleij if (flags) 21589a5e15bSLinus Walleij of_gpio_flags_quirks(np, propname, flags, index); 216a603a2b8SLinus Walleij 2177eb6ce2fSRob Herring pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", 2187eb6ce2fSRob Herring __func__, propname, np, index, 219762c2e46SMasahiro Yamada PTR_ERR_OR_ZERO(desc)); 220762c2e46SMasahiro Yamada 221762c2e46SMasahiro Yamada out: 222762c2e46SMasahiro Yamada of_node_put(gpiospec.np); 223762c2e46SMasahiro Yamada 224762c2e46SMasahiro Yamada return desc; 225f141ed65SGrant Likely } 226f141ed65SGrant Likely 227f01d9075SAlexandre Courbot int of_get_named_gpio_flags(struct device_node *np, const char *list_name, 228f01d9075SAlexandre Courbot int index, enum of_gpio_flags *flags) 229f01d9075SAlexandre Courbot { 230f01d9075SAlexandre Courbot struct gpio_desc *desc; 231f01d9075SAlexandre Courbot 232f01d9075SAlexandre Courbot desc = of_get_named_gpiod_flags(np, list_name, index, flags); 233f01d9075SAlexandre Courbot 234f01d9075SAlexandre Courbot if (IS_ERR(desc)) 235f01d9075SAlexandre Courbot return PTR_ERR(desc); 236f01d9075SAlexandre Courbot else 237f01d9075SAlexandre Courbot return desc_to_gpio(desc); 238f01d9075SAlexandre Courbot } 239f01d9075SAlexandre Courbot EXPORT_SYMBOL(of_get_named_gpio_flags); 240f01d9075SAlexandre Courbot 241c8582339SLinus Walleij /* 242c8582339SLinus Walleij * The SPI GPIO bindings happened before we managed to establish that GPIO 243c8582339SLinus Walleij * properties should be named "foo-gpios" so we have this special kludge for 244c8582339SLinus Walleij * them. 245c8582339SLinus Walleij */ 246c8582339SLinus Walleij static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id, 247c8582339SLinus Walleij enum of_gpio_flags *of_flags) 248c8582339SLinus Walleij { 249c8582339SLinus Walleij char prop_name[32]; /* 32 is max size of property name */ 250c8582339SLinus Walleij struct device_node *np = dev->of_node; 251c8582339SLinus Walleij struct gpio_desc *desc; 252c8582339SLinus Walleij 253c8582339SLinus Walleij /* 254c8582339SLinus Walleij * Hopefully the compiler stubs the rest of the function if this 255c8582339SLinus Walleij * is false. 256c8582339SLinus Walleij */ 257c8582339SLinus Walleij if (!IS_ENABLED(CONFIG_SPI_MASTER)) 258c8582339SLinus Walleij return ERR_PTR(-ENOENT); 259c8582339SLinus Walleij 260c8582339SLinus Walleij /* Allow this specifically for "spi-gpio" devices */ 261c8582339SLinus Walleij if (!of_device_is_compatible(np, "spi-gpio") || !con_id) 262c8582339SLinus Walleij return ERR_PTR(-ENOENT); 263c8582339SLinus Walleij 264c8582339SLinus Walleij /* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */ 265c8582339SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id); 266c8582339SLinus Walleij 267c8582339SLinus Walleij desc = of_get_named_gpiod_flags(np, prop_name, 0, of_flags); 268c8582339SLinus Walleij return desc; 269c8582339SLinus Walleij } 270c8582339SLinus Walleij 2716a537d48SLinus Walleij /* 272e3023bf8SLinus Walleij * The old Freescale bindings use simply "gpios" as name for the chip select 273e3023bf8SLinus Walleij * lines rather than "cs-gpios" like all other SPI hardware. Account for this 274e3023bf8SLinus Walleij * with a special quirk. 275e3023bf8SLinus Walleij */ 276e3023bf8SLinus Walleij static struct gpio_desc *of_find_spi_cs_gpio(struct device *dev, 277e3023bf8SLinus Walleij const char *con_id, 278e3023bf8SLinus Walleij unsigned int idx, 279e3023bf8SLinus Walleij unsigned long *flags) 280e3023bf8SLinus Walleij { 281e3023bf8SLinus Walleij struct device_node *np = dev->of_node; 282e3023bf8SLinus Walleij 283e3023bf8SLinus Walleij if (!IS_ENABLED(CONFIG_SPI_MASTER)) 284e3023bf8SLinus Walleij return ERR_PTR(-ENOENT); 285e3023bf8SLinus Walleij 286e3023bf8SLinus Walleij /* Allow this specifically for Freescale devices */ 287e3023bf8SLinus Walleij if (!of_device_is_compatible(np, "fsl,spi") && 288e3023bf8SLinus Walleij !of_device_is_compatible(np, "aeroflexgaisler,spictrl")) 289e3023bf8SLinus Walleij return ERR_PTR(-ENOENT); 290e3023bf8SLinus Walleij /* Allow only if asking for "cs-gpios" */ 291e3023bf8SLinus Walleij if (!con_id || strcmp(con_id, "cs")) 292e3023bf8SLinus Walleij return ERR_PTR(-ENOENT); 293e3023bf8SLinus Walleij 294e3023bf8SLinus Walleij /* 295e3023bf8SLinus Walleij * While all other SPI controllers use "cs-gpios" the Freescale 296e3023bf8SLinus Walleij * uses just "gpios" so translate to that when "cs-gpios" is 297e3023bf8SLinus Walleij * requested. 298e3023bf8SLinus Walleij */ 299e3023bf8SLinus Walleij return of_find_gpio(dev, NULL, idx, flags); 300e3023bf8SLinus Walleij } 301e3023bf8SLinus Walleij 302e3023bf8SLinus Walleij /* 3036a537d48SLinus Walleij * Some regulator bindings happened before we managed to establish that GPIO 3046a537d48SLinus Walleij * properties should be named "foo-gpios" so we have this special kludge for 3056a537d48SLinus Walleij * them. 3066a537d48SLinus Walleij */ 3076a537d48SLinus Walleij static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *con_id, 3086a537d48SLinus Walleij enum of_gpio_flags *of_flags) 3096a537d48SLinus Walleij { 3106a537d48SLinus Walleij /* These are the connection IDs we accept as legacy GPIO phandles */ 3116a537d48SLinus Walleij const char *whitelist[] = { 3126a537d48SLinus Walleij "wlf,ldoena", /* Arizona */ 3136a537d48SLinus Walleij "wlf,ldo1ena", /* WM8994 */ 3146a537d48SLinus Walleij "wlf,ldo2ena", /* WM8994 */ 3156a537d48SLinus Walleij }; 3166a537d48SLinus Walleij struct device_node *np = dev->of_node; 3176a537d48SLinus Walleij struct gpio_desc *desc; 3186a537d48SLinus Walleij int i; 3196a537d48SLinus Walleij 3206a537d48SLinus Walleij if (!IS_ENABLED(CONFIG_REGULATOR)) 3216a537d48SLinus Walleij return ERR_PTR(-ENOENT); 3226a537d48SLinus Walleij 3236a537d48SLinus Walleij if (!con_id) 3246a537d48SLinus Walleij return ERR_PTR(-ENOENT); 3256a537d48SLinus Walleij 3264b21f94aSAndy Shevchenko i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id); 3274b21f94aSAndy Shevchenko if (i < 0) 3286a537d48SLinus Walleij return ERR_PTR(-ENOENT); 3296a537d48SLinus Walleij 3306a537d48SLinus Walleij desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags); 3316a537d48SLinus Walleij return desc; 3326a537d48SLinus Walleij } 3336a537d48SLinus Walleij 334ea713bc4SLinus Walleij struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, 335fed7026aSAndy Shevchenko unsigned int idx, unsigned long *flags) 336ea713bc4SLinus Walleij { 337ea713bc4SLinus Walleij char prop_name[32]; /* 32 is max size of property name */ 338ea713bc4SLinus Walleij enum of_gpio_flags of_flags; 339ea713bc4SLinus Walleij struct gpio_desc *desc; 340ea713bc4SLinus Walleij unsigned int i; 341ea713bc4SLinus Walleij 342c8582339SLinus Walleij /* Try GPIO property "foo-gpios" and "foo-gpio" */ 343ea713bc4SLinus Walleij for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { 344ea713bc4SLinus Walleij if (con_id) 345ea713bc4SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, 346ea713bc4SLinus Walleij gpio_suffixes[i]); 347ea713bc4SLinus Walleij else 348ea713bc4SLinus Walleij snprintf(prop_name, sizeof(prop_name), "%s", 349ea713bc4SLinus Walleij gpio_suffixes[i]); 350ea713bc4SLinus Walleij 351ea713bc4SLinus Walleij desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, 352ea713bc4SLinus Walleij &of_flags); 3536662ae6aSMaxime Ripard /* 3546662ae6aSMaxime Ripard * -EPROBE_DEFER in our case means that we found a 3556662ae6aSMaxime Ripard * valid GPIO property, but no controller has been 3566662ae6aSMaxime Ripard * registered so far. 3576662ae6aSMaxime Ripard * 3586662ae6aSMaxime Ripard * This means we don't need to look any further for 3596662ae6aSMaxime Ripard * alternate name conventions, and we should really 3606662ae6aSMaxime Ripard * preserve the return code for our user to be able to 3616662ae6aSMaxime Ripard * retry probing later. 3626662ae6aSMaxime Ripard */ 3636662ae6aSMaxime Ripard if (IS_ERR(desc) && PTR_ERR(desc) == -EPROBE_DEFER) 3646662ae6aSMaxime Ripard return desc; 3656662ae6aSMaxime Ripard 366ea713bc4SLinus Walleij if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) 367ea713bc4SLinus Walleij break; 368ea713bc4SLinus Walleij } 369ea713bc4SLinus Walleij 370c8582339SLinus Walleij /* Special handling for SPI GPIOs if used */ 371c8582339SLinus Walleij if (IS_ERR(desc)) 372c8582339SLinus Walleij desc = of_find_spi_gpio(dev, con_id, &of_flags); 373e3023bf8SLinus Walleij if (IS_ERR(desc)) { 374e3023bf8SLinus Walleij /* This quirk looks up flags and all */ 375e3023bf8SLinus Walleij desc = of_find_spi_cs_gpio(dev, con_id, idx, flags); 376e3023bf8SLinus Walleij if (!IS_ERR(desc)) 377e3023bf8SLinus Walleij return desc; 378e3023bf8SLinus Walleij } 379c8582339SLinus Walleij 3806a537d48SLinus Walleij /* Special handling for regulator GPIOs if used */ 381ce27fb2cSChen-Yu Tsai if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) 3826a537d48SLinus Walleij desc = of_find_regulator_gpio(dev, con_id, &of_flags); 3836a537d48SLinus Walleij 384ea713bc4SLinus Walleij if (IS_ERR(desc)) 385ea713bc4SLinus Walleij return desc; 386ea713bc4SLinus Walleij 387ea713bc4SLinus Walleij if (of_flags & OF_GPIO_ACTIVE_LOW) 388ea713bc4SLinus Walleij *flags |= GPIO_ACTIVE_LOW; 389ea713bc4SLinus Walleij 390ea713bc4SLinus Walleij if (of_flags & OF_GPIO_SINGLE_ENDED) { 3914c0facddSLaxman Dewangan if (of_flags & OF_GPIO_OPEN_DRAIN) 392ea713bc4SLinus Walleij *flags |= GPIO_OPEN_DRAIN; 393ea713bc4SLinus Walleij else 394ea713bc4SLinus Walleij *flags |= GPIO_OPEN_SOURCE; 395ea713bc4SLinus Walleij } 396ea713bc4SLinus Walleij 397e10f72bfSAndrew Jeffery if (of_flags & OF_GPIO_TRANSITORY) 398e10f72bfSAndrew Jeffery *flags |= GPIO_TRANSITORY; 39905f479bfSCharles Keepax 400d449991cSThomas Petazzoni if (of_flags & OF_GPIO_PULL_UP) 401d449991cSThomas Petazzoni *flags |= GPIO_PULL_UP; 402d449991cSThomas Petazzoni if (of_flags & OF_GPIO_PULL_DOWN) 403d449991cSThomas Petazzoni *flags |= GPIO_PULL_DOWN; 404d449991cSThomas Petazzoni 405ea713bc4SLinus Walleij return desc; 406ea713bc4SLinus Walleij } 407ea713bc4SLinus Walleij 408f141ed65SGrant Likely /** 409fd7337fdSMarkus Pargmann * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API 410f625d460SBenoit Parrot * @np: device node to get GPIO from 411be715343SMasahiro Yamada * @chip: GPIO chip whose hog is parsed 412a79fead5SGeert Uytterhoeven * @idx: Index of the GPIO to parse 413f625d460SBenoit Parrot * @name: GPIO line name 414fed7026aSAndy Shevchenko * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from 415fed7026aSAndy Shevchenko * of_find_gpio() or of_parse_own_gpio() 416f625d460SBenoit Parrot * @dflags: gpiod_flags - optional GPIO initialization flags 417f625d460SBenoit Parrot * 418f625d460SBenoit Parrot * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno 419f625d460SBenoit Parrot * value on the error condition. 420f625d460SBenoit Parrot */ 421fd7337fdSMarkus Pargmann static struct gpio_desc *of_parse_own_gpio(struct device_node *np, 422be715343SMasahiro Yamada struct gpio_chip *chip, 423a79fead5SGeert Uytterhoeven unsigned int idx, const char **name, 424fed7026aSAndy Shevchenko unsigned long *lflags, 425f625d460SBenoit Parrot enum gpiod_flags *dflags) 426f625d460SBenoit Parrot { 427f625d460SBenoit Parrot struct device_node *chip_np; 428f625d460SBenoit Parrot enum of_gpio_flags xlate_flags; 429be715343SMasahiro Yamada struct of_phandle_args gpiospec; 430be715343SMasahiro Yamada struct gpio_desc *desc; 431a79fead5SGeert Uytterhoeven unsigned int i; 432f625d460SBenoit Parrot u32 tmp; 4333f9547e1SMasahiro Yamada int ret; 434f625d460SBenoit Parrot 435be715343SMasahiro Yamada chip_np = chip->of_node; 436f625d460SBenoit Parrot if (!chip_np) 437f625d460SBenoit Parrot return ERR_PTR(-EINVAL); 438f625d460SBenoit Parrot 439f625d460SBenoit Parrot xlate_flags = 0; 4402d6c06f5SAndy Shevchenko *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 441f625d460SBenoit Parrot *dflags = 0; 442f625d460SBenoit Parrot 443f625d460SBenoit Parrot ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); 444f625d460SBenoit Parrot if (ret) 445f625d460SBenoit Parrot return ERR_PTR(ret); 446f625d460SBenoit Parrot 447be715343SMasahiro Yamada gpiospec.np = chip_np; 448be715343SMasahiro Yamada gpiospec.args_count = tmp; 449f625d460SBenoit Parrot 450a79fead5SGeert Uytterhoeven for (i = 0; i < tmp; i++) { 451a79fead5SGeert Uytterhoeven ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, 452a79fead5SGeert Uytterhoeven &gpiospec.args[i]); 453f625d460SBenoit Parrot if (ret) 454f625d460SBenoit Parrot return ERR_PTR(ret); 455a79fead5SGeert Uytterhoeven } 456f625d460SBenoit Parrot 45799468c1aSMasahiro Yamada desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); 458be715343SMasahiro Yamada if (IS_ERR(desc)) 459be715343SMasahiro Yamada return desc; 460f625d460SBenoit Parrot 461f625d460SBenoit Parrot if (xlate_flags & OF_GPIO_ACTIVE_LOW) 462f625d460SBenoit Parrot *lflags |= GPIO_ACTIVE_LOW; 463e10f72bfSAndrew Jeffery if (xlate_flags & OF_GPIO_TRANSITORY) 464e10f72bfSAndrew Jeffery *lflags |= GPIO_TRANSITORY; 465f625d460SBenoit Parrot 466f625d460SBenoit Parrot if (of_property_read_bool(np, "input")) 467f625d460SBenoit Parrot *dflags |= GPIOD_IN; 468f625d460SBenoit Parrot else if (of_property_read_bool(np, "output-low")) 469f625d460SBenoit Parrot *dflags |= GPIOD_OUT_LOW; 470f625d460SBenoit Parrot else if (of_property_read_bool(np, "output-high")) 471f625d460SBenoit Parrot *dflags |= GPIOD_OUT_HIGH; 472f625d460SBenoit Parrot else { 47362cdcb6cSRob Herring pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", 47462cdcb6cSRob Herring desc_to_gpio(desc), np); 475f625d460SBenoit Parrot return ERR_PTR(-EINVAL); 476f625d460SBenoit Parrot } 477f625d460SBenoit Parrot 478f625d460SBenoit Parrot if (name && of_property_read_string(np, "line-name", name)) 479f625d460SBenoit Parrot *name = np->name; 480f625d460SBenoit Parrot 481be715343SMasahiro Yamada return desc; 482f625d460SBenoit Parrot } 483f625d460SBenoit Parrot 484f625d460SBenoit Parrot /** 485fd7337fdSMarkus Pargmann * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions 486f625d460SBenoit Parrot * @chip: gpio chip to act on 487f625d460SBenoit Parrot * 488f625d460SBenoit Parrot * This is only used by of_gpiochip_add to request/set GPIO initial 489f625d460SBenoit Parrot * configuration. 490ead066e6SGeert Uytterhoeven * It returns error if it fails otherwise 0 on success. 491f625d460SBenoit Parrot */ 492dfbd379bSLaxman Dewangan static int of_gpiochip_scan_gpios(struct gpio_chip *chip) 493f625d460SBenoit Parrot { 494f625d460SBenoit Parrot struct gpio_desc *desc = NULL; 495f625d460SBenoit Parrot struct device_node *np; 496f625d460SBenoit Parrot const char *name; 497fed7026aSAndy Shevchenko unsigned long lflags; 498f625d460SBenoit Parrot enum gpiod_flags dflags; 499a79fead5SGeert Uytterhoeven unsigned int i; 500dfbd379bSLaxman Dewangan int ret; 501f625d460SBenoit Parrot 502d1279d94SLaxman Dewangan for_each_available_child_of_node(chip->of_node, np) { 503f625d460SBenoit Parrot if (!of_property_read_bool(np, "gpio-hog")) 504f625d460SBenoit Parrot continue; 505f625d460SBenoit Parrot 506a79fead5SGeert Uytterhoeven for (i = 0;; i++) { 507a79fead5SGeert Uytterhoeven desc = of_parse_own_gpio(np, chip, i, &name, &lflags, 508a79fead5SGeert Uytterhoeven &dflags); 509f625d460SBenoit Parrot if (IS_ERR(desc)) 510a79fead5SGeert Uytterhoeven break; 511f625d460SBenoit Parrot 512dfbd379bSLaxman Dewangan ret = gpiod_hog(desc, name, lflags, dflags); 51309e258afSWei Yongjun if (ret < 0) { 51409e258afSWei Yongjun of_node_put(np); 515dfbd379bSLaxman Dewangan return ret; 516f625d460SBenoit Parrot } 51709e258afSWei Yongjun } 518a79fead5SGeert Uytterhoeven } 519dfbd379bSLaxman Dewangan 520dfbd379bSLaxman Dewangan return 0; 521f625d460SBenoit Parrot } 522f625d460SBenoit Parrot 523f625d460SBenoit Parrot /** 52467049c50SThierry Reding * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags 525f141ed65SGrant Likely * @gc: pointer to the gpio_chip structure 52667049c50SThierry Reding * @gpiospec: GPIO specifier as found in the device tree 527f141ed65SGrant Likely * @flags: a flags pointer to fill in 528f141ed65SGrant Likely * 529f141ed65SGrant Likely * This is simple translation function, suitable for the most 1:1 mapped 53067049c50SThierry Reding * GPIO chips. This function performs only one sanity check: whether GPIO 531f141ed65SGrant Likely * is less than ngpios (that is specified in the gpio_chip). 532f141ed65SGrant Likely */ 533f141ed65SGrant Likely int of_gpio_simple_xlate(struct gpio_chip *gc, 534f141ed65SGrant Likely const struct of_phandle_args *gpiospec, u32 *flags) 535f141ed65SGrant Likely { 536f141ed65SGrant Likely /* 537f141ed65SGrant Likely * We're discouraging gpio_cells < 2, since that way you'll have to 53820a8a968SColin Cronin * write your own xlate function (that will have to retrieve the GPIO 539f141ed65SGrant Likely * number and the flags from a single gpio cell -- this is possible, 540f141ed65SGrant Likely * but not recommended). 541f141ed65SGrant Likely */ 542f141ed65SGrant Likely if (gc->of_gpio_n_cells < 2) { 543f141ed65SGrant Likely WARN_ON(1); 544f141ed65SGrant Likely return -EINVAL; 545f141ed65SGrant Likely } 546f141ed65SGrant Likely 547f141ed65SGrant Likely if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) 548f141ed65SGrant Likely return -EINVAL; 549f141ed65SGrant Likely 5507b96c686SGrant Likely if (gpiospec->args[0] >= gc->ngpio) 551f141ed65SGrant Likely return -EINVAL; 552f141ed65SGrant Likely 553f141ed65SGrant Likely if (flags) 554f141ed65SGrant Likely *flags = gpiospec->args[1]; 555f141ed65SGrant Likely 556f141ed65SGrant Likely return gpiospec->args[0]; 557f141ed65SGrant Likely } 558f141ed65SGrant Likely EXPORT_SYMBOL(of_gpio_simple_xlate); 559f141ed65SGrant Likely 560f141ed65SGrant Likely /** 5613208b0f0SLinus Walleij * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) 562f141ed65SGrant Likely * @np: device node of the GPIO chip 563f141ed65SGrant Likely * @mm_gc: pointer to the of_mm_gpio_chip allocated structure 5643208b0f0SLinus Walleij * @data: driver data to store in the struct gpio_chip 565f141ed65SGrant Likely * 566f141ed65SGrant Likely * To use this function you should allocate and fill mm_gc with: 567f141ed65SGrant Likely * 568f141ed65SGrant Likely * 1) In the gpio_chip structure: 569f141ed65SGrant Likely * - all the callbacks 570f141ed65SGrant Likely * - of_gpio_n_cells 571f141ed65SGrant Likely * - of_xlate callback (optional) 572f141ed65SGrant Likely * 573f141ed65SGrant Likely * 3) In the of_mm_gpio_chip structure: 574f141ed65SGrant Likely * - save_regs callback (optional) 575f141ed65SGrant Likely * 576f141ed65SGrant Likely * If succeeded, this function will map bank's memory and will 577f141ed65SGrant Likely * do all necessary work for you. Then you'll able to use .regs 578f141ed65SGrant Likely * to manage GPIOs from the callbacks. 579f141ed65SGrant Likely */ 5803208b0f0SLinus Walleij int of_mm_gpiochip_add_data(struct device_node *np, 5813208b0f0SLinus Walleij struct of_mm_gpio_chip *mm_gc, 5823208b0f0SLinus Walleij void *data) 583f141ed65SGrant Likely { 584f141ed65SGrant Likely int ret = -ENOMEM; 585f141ed65SGrant Likely struct gpio_chip *gc = &mm_gc->gc; 586f141ed65SGrant Likely 5877eb6ce2fSRob Herring gc->label = kasprintf(GFP_KERNEL, "%pOF", np); 588f141ed65SGrant Likely if (!gc->label) 589f141ed65SGrant Likely goto err0; 590f141ed65SGrant Likely 591f141ed65SGrant Likely mm_gc->regs = of_iomap(np, 0); 592f141ed65SGrant Likely if (!mm_gc->regs) 593f141ed65SGrant Likely goto err1; 594f141ed65SGrant Likely 595f141ed65SGrant Likely gc->base = -1; 596f141ed65SGrant Likely 597f141ed65SGrant Likely if (mm_gc->save_regs) 598f141ed65SGrant Likely mm_gc->save_regs(mm_gc); 599f141ed65SGrant Likely 600f141ed65SGrant Likely mm_gc->gc.of_node = np; 601f141ed65SGrant Likely 6023208b0f0SLinus Walleij ret = gpiochip_add_data(gc, data); 603f141ed65SGrant Likely if (ret) 604f141ed65SGrant Likely goto err2; 605f141ed65SGrant Likely 606f141ed65SGrant Likely return 0; 607f141ed65SGrant Likely err2: 608f141ed65SGrant Likely iounmap(mm_gc->regs); 609f141ed65SGrant Likely err1: 610f141ed65SGrant Likely kfree(gc->label); 611f141ed65SGrant Likely err0: 6127eb6ce2fSRob Herring pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); 613f141ed65SGrant Likely return ret; 614f141ed65SGrant Likely } 6153208b0f0SLinus Walleij EXPORT_SYMBOL(of_mm_gpiochip_add_data); 616f141ed65SGrant Likely 617d621e8baSRicardo Ribalda Delgado /** 618d621e8baSRicardo Ribalda Delgado * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) 619d621e8baSRicardo Ribalda Delgado * @mm_gc: pointer to the of_mm_gpio_chip allocated structure 620d621e8baSRicardo Ribalda Delgado */ 621d621e8baSRicardo Ribalda Delgado void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) 622d621e8baSRicardo Ribalda Delgado { 623d621e8baSRicardo Ribalda Delgado struct gpio_chip *gc = &mm_gc->gc; 624d621e8baSRicardo Ribalda Delgado 625d621e8baSRicardo Ribalda Delgado if (!mm_gc) 626d621e8baSRicardo Ribalda Delgado return; 627d621e8baSRicardo Ribalda Delgado 628d621e8baSRicardo Ribalda Delgado gpiochip_remove(gc); 629d621e8baSRicardo Ribalda Delgado iounmap(mm_gc->regs); 630d621e8baSRicardo Ribalda Delgado kfree(gc->label); 631d621e8baSRicardo Ribalda Delgado } 632d621e8baSRicardo Ribalda Delgado EXPORT_SYMBOL(of_mm_gpiochip_remove); 633d621e8baSRicardo Ribalda Delgado 634726cb3baSStephen Boyd static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) 635726cb3baSStephen Boyd { 636726cb3baSStephen Boyd int len, i; 637726cb3baSStephen Boyd u32 start, count; 638726cb3baSStephen Boyd struct device_node *np = chip->of_node; 639726cb3baSStephen Boyd 640726cb3baSStephen Boyd len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); 641726cb3baSStephen Boyd if (len < 0 || len % 2 != 0) 642726cb3baSStephen Boyd return; 643726cb3baSStephen Boyd 644726cb3baSStephen Boyd for (i = 0; i < len; i += 2) { 645726cb3baSStephen Boyd of_property_read_u32_index(np, "gpio-reserved-ranges", 646726cb3baSStephen Boyd i, &start); 647726cb3baSStephen Boyd of_property_read_u32_index(np, "gpio-reserved-ranges", 648726cb3baSStephen Boyd i + 1, &count); 649726cb3baSStephen Boyd if (start >= chip->ngpio || start + count >= chip->ngpio) 650726cb3baSStephen Boyd continue; 651726cb3baSStephen Boyd 652726cb3baSStephen Boyd bitmap_clear(chip->valid_mask, start, count); 653726cb3baSStephen Boyd } 654726cb3baSStephen Boyd }; 655726cb3baSStephen Boyd 656f23f1516SShiraz Hashim #ifdef CONFIG_PINCTRL 65728355f81STomeu Vizoso static int of_gpiochip_add_pin_range(struct gpio_chip *chip) 658f23f1516SShiraz Hashim { 659f23f1516SShiraz Hashim struct device_node *np = chip->of_node; 660f23f1516SShiraz Hashim struct of_phandle_args pinspec; 6611e63d7b9SLinus Walleij struct pinctrl_dev *pctldev; 662f23f1516SShiraz Hashim int index = 0, ret; 663586a87e6SChristian Ruppert const char *name; 664586a87e6SChristian Ruppert static const char group_names_propname[] = "gpio-ranges-group-names"; 665586a87e6SChristian Ruppert struct property *group_names; 666f23f1516SShiraz Hashim 667f23f1516SShiraz Hashim if (!np) 66828355f81STomeu Vizoso return 0; 669f23f1516SShiraz Hashim 670586a87e6SChristian Ruppert group_names = of_find_property(np, group_names_propname, NULL); 671586a87e6SChristian Ruppert 672ad4e1a7cSHaojian Zhuang for (;; index++) { 673d9fe0039SStephen Warren ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 674d9fe0039SStephen Warren index, &pinspec); 675f23f1516SShiraz Hashim if (ret) 676f23f1516SShiraz Hashim break; 677f23f1516SShiraz Hashim 6781e63d7b9SLinus Walleij pctldev = of_pinctrl_get(pinspec.np); 679602cf638SMasahiro Yamada of_node_put(pinspec.np); 6801e63d7b9SLinus Walleij if (!pctldev) 68128355f81STomeu Vizoso return -EPROBE_DEFER; 682f23f1516SShiraz Hashim 683586a87e6SChristian Ruppert if (pinspec.args[2]) { 684586a87e6SChristian Ruppert if (group_names) { 68572858602SLaurent Navet of_property_read_string_index(np, 686586a87e6SChristian Ruppert group_names_propname, 687586a87e6SChristian Ruppert index, &name); 688586a87e6SChristian Ruppert if (strlen(name)) { 6897eb6ce2fSRob Herring pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", 6907eb6ce2fSRob Herring np); 691586a87e6SChristian Ruppert break; 692586a87e6SChristian Ruppert } 693586a87e6SChristian Ruppert } 694586a87e6SChristian Ruppert /* npins != 0: linear range */ 6951e63d7b9SLinus Walleij ret = gpiochip_add_pin_range(chip, 696ef5e3eefSHaojian Zhuang pinctrl_dev_get_devname(pctldev), 6971e63d7b9SLinus Walleij pinspec.args[0], 69886853c83SHaojian Zhuang pinspec.args[1], 69986853c83SHaojian Zhuang pinspec.args[2]); 7001e63d7b9SLinus Walleij if (ret) 70128355f81STomeu Vizoso return ret; 702586a87e6SChristian Ruppert } else { 703586a87e6SChristian Ruppert /* npins == 0: special range */ 704586a87e6SChristian Ruppert if (pinspec.args[1]) { 7057eb6ce2fSRob Herring pr_err("%pOF: Illegal gpio-range format.\n", 7067eb6ce2fSRob Herring np); 707586a87e6SChristian Ruppert break; 708586a87e6SChristian Ruppert } 709586a87e6SChristian Ruppert 710586a87e6SChristian Ruppert if (!group_names) { 7117eb6ce2fSRob Herring pr_err("%pOF: GPIO group range requested but no %s property.\n", 7127eb6ce2fSRob Herring np, group_names_propname); 713586a87e6SChristian Ruppert break; 714586a87e6SChristian Ruppert } 715586a87e6SChristian Ruppert 716586a87e6SChristian Ruppert ret = of_property_read_string_index(np, 717586a87e6SChristian Ruppert group_names_propname, 718586a87e6SChristian Ruppert index, &name); 719586a87e6SChristian Ruppert if (ret) 720586a87e6SChristian Ruppert break; 721586a87e6SChristian Ruppert 722586a87e6SChristian Ruppert if (!strlen(name)) { 7237eb6ce2fSRob Herring pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", 7247eb6ce2fSRob Herring np); 725586a87e6SChristian Ruppert break; 726586a87e6SChristian Ruppert } 727586a87e6SChristian Ruppert 728586a87e6SChristian Ruppert ret = gpiochip_add_pingroup_range(chip, pctldev, 729586a87e6SChristian Ruppert pinspec.args[0], name); 730586a87e6SChristian Ruppert if (ret) 73128355f81STomeu Vizoso return ret; 732586a87e6SChristian Ruppert } 733ad4e1a7cSHaojian Zhuang } 73428355f81STomeu Vizoso 73528355f81STomeu Vizoso return 0; 736f23f1516SShiraz Hashim } 737f23f1516SShiraz Hashim 738f23f1516SShiraz Hashim #else 73928355f81STomeu Vizoso static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } 740f23f1516SShiraz Hashim #endif 741f23f1516SShiraz Hashim 74228355f81STomeu Vizoso int of_gpiochip_add(struct gpio_chip *chip) 743f141ed65SGrant Likely { 74428355f81STomeu Vizoso int status; 74528355f81STomeu Vizoso 746f141ed65SGrant Likely if (!chip->of_node) 74728355f81STomeu Vizoso return 0; 748f141ed65SGrant Likely 749f141ed65SGrant Likely if (!chip->of_xlate) { 750f141ed65SGrant Likely chip->of_gpio_n_cells = 2; 751f141ed65SGrant Likely chip->of_xlate = of_gpio_simple_xlate; 752f141ed65SGrant Likely } 753f141ed65SGrant Likely 7541020dfd1SMasahiro Yamada if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) 7551020dfd1SMasahiro Yamada return -EINVAL; 7561020dfd1SMasahiro Yamada 757726cb3baSStephen Boyd of_gpiochip_init_valid_mask(chip); 758726cb3baSStephen Boyd 75928355f81STomeu Vizoso status = of_gpiochip_add_pin_range(chip); 76028355f81STomeu Vizoso if (status) 76128355f81STomeu Vizoso return status; 76228355f81STomeu Vizoso 763fd9c5531SLinus Walleij /* If the chip defines names itself, these take precedence */ 764fd9c5531SLinus Walleij if (!chip->names) 76582270335SChristophe Leroy devprop_gpiochip_set_names(chip, 76682270335SChristophe Leroy of_fwnode_handle(chip->of_node)); 767fd9c5531SLinus Walleij 768f141ed65SGrant Likely of_node_get(chip->of_node); 769f625d460SBenoit Parrot 770f7299d44SGeert Uytterhoeven status = of_gpiochip_scan_gpios(chip); 771f7299d44SGeert Uytterhoeven if (status) { 772f7299d44SGeert Uytterhoeven of_node_put(chip->of_node); 773f7299d44SGeert Uytterhoeven gpiochip_remove_pin_ranges(chip); 774f7299d44SGeert Uytterhoeven } 775f7299d44SGeert Uytterhoeven 776f7299d44SGeert Uytterhoeven return status; 777f141ed65SGrant Likely } 778f141ed65SGrant Likely 779f141ed65SGrant Likely void of_gpiochip_remove(struct gpio_chip *chip) 780f141ed65SGrant Likely { 781e93fa3f2SLinus Walleij gpiochip_remove_pin_ranges(chip); 782f141ed65SGrant Likely of_node_put(chip->of_node); 783f141ed65SGrant Likely } 784