diff options
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 1113 |
1 files changed, 1113 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c new file mode 100644 index 0000000000..d9525d95e8 --- /dev/null +++ b/drivers/gpio/gpiolib-of.c @@ -0,0 +1,1113 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * OF helpers for the GPIO API + * + * Copyright (c) 2007-2008 MontaVista Software, Inc. + * + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_gpio.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/slab.h> +#include <linux/string.h> + +#include <linux/gpio/consumer.h> +#include <linux/gpio/machine.h> + +#include "gpiolib.h" +#include "gpiolib-of.h" + +/* + * This is Linux-specific flags. By default controllers' and Linux' mapping + * match, but GPIO controllers are free to translate their own flags to + * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended. + */ +enum of_gpio_flags { + OF_GPIO_ACTIVE_LOW = 0x1, + OF_GPIO_SINGLE_ENDED = 0x2, + OF_GPIO_OPEN_DRAIN = 0x4, + OF_GPIO_TRANSITORY = 0x8, + OF_GPIO_PULL_UP = 0x10, + OF_GPIO_PULL_DOWN = 0x20, + OF_GPIO_PULL_DISABLE = 0x40, +}; + +/** + * of_gpio_named_count() - Count GPIOs for a device + * @np: device node to count GPIOs for + * @propname: property name containing gpio specifier(s) + * + * The function returns the count of GPIOs specified for a node. + * Note that the empty GPIO specifiers count too. Returns either + * Number of gpios defined in property, + * -EINVAL for an incorrectly formed gpios property, or + * -ENOENT for a missing gpios property + * + * Example: + * gpios = <0 + * &gpio1 1 2 + * 0 + * &gpio2 3 4>; + * + * The above example defines four GPIOs, two of which are not specified. + * This function will return '4' + */ +static int of_gpio_named_count(const struct device_node *np, + const char *propname) +{ + return of_count_phandle_with_args(np, propname, "#gpio-cells"); +} + +/** + * of_gpio_spi_cs_get_count() - special GPIO counting for SPI + * @dev: Consuming device + * @con_id: Function within the GPIO consumer + * + * Some elder GPIO controllers need special quirks. Currently we handle + * the Freescale and PPC GPIO controller with bindings that doesn't use the + * established "cs-gpios" for chip selects but instead rely on + * "gpios" for the chip select lines. If we detect this, we redirect + * the counting of "cs-gpios" to count "gpios" transparent to the + * driver. + */ +static int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id) +{ + struct device_node *np = dev->of_node; + + if (!IS_ENABLED(CONFIG_SPI_MASTER)) + return 0; + if (!con_id || strcmp(con_id, "cs")) + return 0; + if (!of_device_is_compatible(np, "fsl,spi") && + !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && + !of_device_is_compatible(np, "ibm,ppc4xx-spi")) + return 0; + return of_gpio_named_count(np, "gpios"); +} + +int of_gpio_get_count(struct device *dev, const char *con_id) +{ + int ret; + char propname[32]; + unsigned int i; + + ret = of_gpio_spi_cs_get_count(dev, con_id); + if (ret > 0) + return ret; + + for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { + if (con_id) + snprintf(propname, sizeof(propname), "%s-%s", + con_id, gpio_suffixes[i]); + else + snprintf(propname, sizeof(propname), "%s", + gpio_suffixes[i]); + + ret = of_gpio_named_count(dev->of_node, propname); + if (ret > 0) + break; + } + return ret ? ret : -ENOENT; +} + +static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) +{ + struct of_phandle_args *gpiospec = data; + + return device_match_of_node(&chip->gpiodev->dev, gpiospec->np) && + chip->of_xlate && + chip->of_xlate(chip, gpiospec, NULL) >= 0; +} + +static struct gpio_chip *of_find_gpiochip_by_xlate( + struct of_phandle_args *gpiospec) +{ + return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate); +} + +static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, + struct of_phandle_args *gpiospec, + enum of_gpio_flags *flags) +{ + int ret; + + if (chip->of_gpio_n_cells != gpiospec->args_count) + return ERR_PTR(-EINVAL); + + ret = chip->of_xlate(chip, gpiospec, flags); + if (ret < 0) + return ERR_PTR(ret); + + return gpiochip_get_desc(chip, ret); +} + +/* + * Overrides stated polarity of a gpio line and warns when there is a + * discrepancy. + */ +static void of_gpio_quirk_polarity(const struct device_node *np, + bool active_high, + enum of_gpio_flags *flags) +{ + if (active_high) { + if (*flags & OF_GPIO_ACTIVE_LOW) { + pr_warn("%s GPIO handle specifies active low - ignored\n", + of_node_full_name(np)); + *flags &= ~OF_GPIO_ACTIVE_LOW; + } + } else { + if (!(*flags & OF_GPIO_ACTIVE_LOW)) + pr_info("%s enforce active low on GPIO handle\n", + of_node_full_name(np)); + *flags |= OF_GPIO_ACTIVE_LOW; + } +} + +/* + * This quirk does static polarity overrides in cases where existing + * DTS specified incorrect polarity. + */ +static void of_gpio_try_fixup_polarity(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags) +{ + static const struct { + const char *compatible; + const char *propname; + bool active_high; + } gpios[] = { +#if !IS_ENABLED(CONFIG_LCD_HX8357) + /* + * Himax LCD controllers used incorrectly named + * "gpios-reset" property and also specified wrong + * polarity. + */ + { "himax,hx8357", "gpios-reset", false }, + { "himax,hx8369", "gpios-reset", false }, +#endif + }; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (of_device_is_compatible(np, gpios[i].compatible) && + !strcmp(propname, gpios[i].propname)) { + of_gpio_quirk_polarity(np, gpios[i].active_high, flags); + break; + } + } +} + +static void of_gpio_set_polarity_by_property(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags) +{ + const struct device_node *np_compat = np; + const struct device_node *np_propname = np; + static const struct { + const char *compatible; + const char *gpio_propname; + const char *polarity_propname; + } gpios[] = { +#if IS_ENABLED(CONFIG_FEC) + /* Freescale Fast Ethernet Controller */ + { "fsl,imx25-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx27-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx28-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx6q-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,mvf600-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx6sx-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx6ul-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx8mq-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx8qm-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,s32v234-fec", "phy-reset-gpios", "phy-reset-active-high" }, +#endif +#if IS_ENABLED(CONFIG_PCI_IMX6) + { "fsl,imx6q-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx6sx-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx6qp-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx7d-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx8mq-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx8mm-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx8mp-pcie", "reset-gpio", "reset-gpio-active-high" }, +#endif + + /* + * The regulator GPIO handles are specified such that the + * presence or absence of "enable-active-high" solely controls + * the polarity of the GPIO line. Any phandle flags must + * be actively ignored. + */ +#if IS_ENABLED(CONFIG_REGULATOR_FIXED_VOLTAGE) + { "regulator-fixed", "gpios", "enable-active-high" }, + { "regulator-fixed", "gpio", "enable-active-high" }, + { "reg-fixed-voltage", "gpios", "enable-active-high" }, + { "reg-fixed-voltage", "gpio", "enable-active-high" }, +#endif +#if IS_ENABLED(CONFIG_REGULATOR_GPIO) + { "regulator-gpio", "enable-gpio", "enable-active-high" }, + { "regulator-gpio", "enable-gpios", "enable-active-high" }, +#endif +#if IS_ENABLED(CONFIG_MMC_ATMELMCI) + { "atmel,hsmci", "cd-gpios", "cd-inverted" }, +#endif + }; + unsigned int i; + bool active_high; + +#if IS_ENABLED(CONFIG_MMC_ATMELMCI) + /* + * The Atmel HSMCI has compatible property in the parent node and + * gpio property in a child node + */ + if (of_device_is_compatible(np->parent, "atmel,hsmci")) { + np_compat = np->parent; + np_propname = np; + } +#endif + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (of_device_is_compatible(np_compat, gpios[i].compatible) && + !strcmp(propname, gpios[i].gpio_propname)) { + active_high = of_property_read_bool(np_propname, + gpios[i].polarity_propname); + of_gpio_quirk_polarity(np, active_high, flags); + break; + } + } +} + +static void of_gpio_flags_quirks(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags, + int index) +{ + of_gpio_try_fixup_polarity(np, propname, flags); + of_gpio_set_polarity_by_property(np, propname, flags); + + /* + * Legacy open drain handling for fixed voltage regulators. + */ + if (IS_ENABLED(CONFIG_REGULATOR) && + of_device_is_compatible(np, "reg-fixed-voltage") && + of_property_read_bool(np, "gpio-open-drain")) { + *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); + pr_info("%s uses legacy open drain flag - update the DTS if you can\n", + of_node_full_name(np)); + } + + /* + * Legacy handling of SPI active high chip select. If we have a + * property named "cs-gpios" we need to inspect the child node + * to determine if the flags should have inverted semantics. + */ + if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") && + of_property_read_bool(np, "cs-gpios")) { + struct device_node *child; + u32 cs; + int ret; + + for_each_child_of_node(np, child) { + ret = of_property_read_u32(child, "reg", &cs); + if (ret) + continue; + if (cs == index) { + /* + * SPI children have active low chip selects + * by default. This can be specified negatively + * by just omitting "spi-cs-high" in the + * device node, or actively by tagging on + * GPIO_ACTIVE_LOW as flag in the device + * tree. If the line is simultaneously + * tagged as active low in the device tree + * and has the "spi-cs-high" set, we get a + * conflict and the "spi-cs-high" flag will + * take precedence. + */ + bool active_high = of_property_read_bool(child, + "spi-cs-high"); + of_gpio_quirk_polarity(child, active_high, + flags); + of_node_put(child); + break; + } + } + } + + /* Legacy handling of stmmac's active-low PHY reset line */ + if (IS_ENABLED(CONFIG_STMMAC_ETH) && + !strcmp(propname, "snps,reset-gpio") && + of_property_read_bool(np, "snps,reset-active-low")) + *flags |= OF_GPIO_ACTIVE_LOW; +} + +/** + * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API + * @np: device node to get GPIO from + * @propname: property name containing gpio specifier(s) + * @index: index of the GPIO + * @flags: a flags pointer to fill in + * + * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno + * value on the error condition. If @flags is not NULL the function also fills + * in flags for the GPIO. + */ +static struct gpio_desc *of_get_named_gpiod_flags(const struct device_node *np, + const char *propname, int index, enum of_gpio_flags *flags) +{ + struct of_phandle_args gpiospec; + struct gpio_chip *chip; + struct gpio_desc *desc; + int ret; + + ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, + &gpiospec); + if (ret) { + pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", + __func__, propname, np, index); + return ERR_PTR(ret); + } + + chip = of_find_gpiochip_by_xlate(&gpiospec); + if (!chip) { + desc = ERR_PTR(-EPROBE_DEFER); + goto out; + } + + desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); + if (IS_ERR(desc)) + goto out; + + if (flags) + of_gpio_flags_quirks(np, propname, flags, index); + + pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", + __func__, propname, np, index, + PTR_ERR_OR_ZERO(desc)); + +out: + of_node_put(gpiospec.np); + + return desc; +} + +/** + * of_get_named_gpio() - Get a GPIO number to use with GPIO API + * @np: device node to get GPIO from + * @propname: Name of property containing gpio specifier(s) + * @index: index of the GPIO + * + * Returns GPIO number to use with Linux generic GPIO API, or one of the errno + * value on the error condition. + */ +int of_get_named_gpio(const struct device_node *np, const char *propname, + int index) +{ + struct gpio_desc *desc; + + desc = of_get_named_gpiod_flags(np, propname, index, NULL); + + if (IS_ERR(desc)) + return PTR_ERR(desc); + else + return desc_to_gpio(desc); +} +EXPORT_SYMBOL_GPL(of_get_named_gpio); + +/* Converts gpio_lookup_flags into bitmask of GPIO_* values */ +static unsigned long of_convert_gpio_flags(enum of_gpio_flags flags) +{ + unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; + + if (flags & OF_GPIO_ACTIVE_LOW) + lflags |= GPIO_ACTIVE_LOW; + + if (flags & OF_GPIO_SINGLE_ENDED) { + if (flags & OF_GPIO_OPEN_DRAIN) + lflags |= GPIO_OPEN_DRAIN; + else + lflags |= GPIO_OPEN_SOURCE; + } + + if (flags & OF_GPIO_TRANSITORY) + lflags |= GPIO_TRANSITORY; + + if (flags & OF_GPIO_PULL_UP) + lflags |= GPIO_PULL_UP; + + if (flags & OF_GPIO_PULL_DOWN) + lflags |= GPIO_PULL_DOWN; + + if (flags & OF_GPIO_PULL_DISABLE) + lflags |= GPIO_PULL_DISABLE; + + return lflags; +} + +static struct gpio_desc *of_find_gpio_rename(struct device_node *np, + const char *con_id, + unsigned int idx, + enum of_gpio_flags *of_flags) +{ + static const struct of_rename_gpio { + const char *con_id; + const char *legacy_id; /* NULL - same as con_id */ + /* + * Compatible string can be set to NULL in case where + * matching to a particular compatible is not practical, + * but it should only be done for gpio names that have + * vendor prefix to reduce risk of false positives. + * Addition of such entries is strongly discouraged. + */ + const char *compatible; + } gpios[] = { +#if !IS_ENABLED(CONFIG_LCD_HX8357) + /* Himax LCD controllers used "gpios-reset" */ + { "reset", "gpios-reset", "himax,hx8357" }, + { "reset", "gpios-reset", "himax,hx8369" }, +#endif +#if IS_ENABLED(CONFIG_MFD_ARIZONA) + { "wlf,reset", NULL, NULL }, +#endif +#if IS_ENABLED(CONFIG_RTC_DRV_MOXART) + { "rtc-data", "gpio-rtc-data", "moxa,moxart-rtc" }, + { "rtc-sclk", "gpio-rtc-sclk", "moxa,moxart-rtc" }, + { "rtc-reset", "gpio-rtc-reset", "moxa,moxart-rtc" }, +#endif +#if IS_ENABLED(CONFIG_NFC_MRVL_I2C) + { "reset", "reset-n-io", "marvell,nfc-i2c" }, +#endif +#if IS_ENABLED(CONFIG_NFC_MRVL_SPI) + { "reset", "reset-n-io", "marvell,nfc-spi" }, +#endif +#if IS_ENABLED(CONFIG_NFC_MRVL_UART) + { "reset", "reset-n-io", "marvell,nfc-uart" }, + { "reset", "reset-n-io", "mrvl,nfc-uart" }, +#endif +#if !IS_ENABLED(CONFIG_PCI_LANTIQ) + /* MIPS Lantiq PCI */ + { "reset", "gpios-reset", "lantiq,pci-xway" }, +#endif + + /* + * Some regulator bindings happened before we managed to + * establish that GPIO properties should be named + * "foo-gpios" so we have this special kludge for them. + */ +#if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1) + { "wlf,ldoena", NULL, NULL }, /* Arizona */ +#endif +#if IS_ENABLED(CONFIG_REGULATOR_WM8994) + { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */ + { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */ +#endif + +#if IS_ENABLED(CONFIG_SND_SOC_CS42L56) + { "reset", "cirrus,gpio-nreset", "cirrus,cs42l56" }, +#endif +#if IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448) + { "i2s1-in-sel-gpio1", NULL, "mediatek,mt2701-cs42448-machine" }, + { "i2s1-in-sel-gpio2", NULL, "mediatek,mt2701-cs42448-machine" }, +#endif +#if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X) + { "reset", "gpio-reset", "ti,tlv320aic3x" }, + { "reset", "gpio-reset", "ti,tlv320aic33" }, + { "reset", "gpio-reset", "ti,tlv320aic3007" }, + { "reset", "gpio-reset", "ti,tlv320aic3104" }, + { "reset", "gpio-reset", "ti,tlv320aic3106" }, +#endif +#if IS_ENABLED(CONFIG_SPI_GPIO) + /* + * The SPI GPIO bindings happened before we managed to + * establish that GPIO properties should be named + * "foo-gpios" so we have this special kludge for them. + */ + { "miso", "gpio-miso", "spi-gpio" }, + { "mosi", "gpio-mosi", "spi-gpio" }, + { "sck", "gpio-sck", "spi-gpio" }, +#endif + + /* + * The old Freescale bindings use simply "gpios" as name + * for the chip select lines rather than "cs-gpios" like + * all other SPI hardware. Allow this specifically for + * Freescale and PPC devices. + */ +#if IS_ENABLED(CONFIG_SPI_FSL_SPI) + { "cs", "gpios", "fsl,spi" }, + { "cs", "gpios", "aeroflexgaisler,spictrl" }, +#endif +#if IS_ENABLED(CONFIG_SPI_PPC4xx) + { "cs", "gpios", "ibm,ppc4xx-spi" }, +#endif + +#if IS_ENABLED(CONFIG_TYPEC_FUSB302) + /* + * Fairchild FUSB302 host is using undocumented "fcs,int_n" + * property without the compulsory "-gpios" suffix. + */ + { "fcs,int_n", NULL, "fcs,fusb302" }, +#endif + }; + struct gpio_desc *desc; + const char *legacy_id; + unsigned int i; + + if (!con_id) + return ERR_PTR(-ENOENT); + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (strcmp(con_id, gpios[i].con_id)) + continue; + + if (gpios[i].compatible && + !of_device_is_compatible(np, gpios[i].compatible)) + continue; + + legacy_id = gpios[i].legacy_id ?: gpios[i].con_id; + desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags); + if (!gpiod_not_found(desc)) { + pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n", + of_node_full_name(np), legacy_id, con_id); + return desc; + } + } + + return ERR_PTR(-ENOENT); +} + +static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np, + const char *con_id, + unsigned int idx, + enum of_gpio_flags *of_flags) +{ + struct gpio_desc *desc; + const char *legacy_id; + + if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)) + return ERR_PTR(-ENOENT); + + if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine")) + return ERR_PTR(-ENOENT); + + if (!con_id || strcmp(con_id, "i2s1-in-sel")) + return ERR_PTR(-ENOENT); + + if (idx == 0) + legacy_id = "i2s1-in-sel-gpio1"; + else if (idx == 1) + legacy_id = "i2s1-in-sel-gpio2"; + else + return ERR_PTR(-ENOENT); + + desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags); + if (!gpiod_not_found(desc)) + pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n", + of_node_full_name(np), legacy_id, con_id); + + return desc; +} + +typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, + const char *con_id, + unsigned int idx, + enum of_gpio_flags *of_flags); +static const of_find_gpio_quirk of_find_gpio_quirks[] = { + of_find_gpio_rename, + of_find_mt2701_gpio, + NULL +}; + +struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, + unsigned int idx, unsigned long *flags) +{ + char prop_name[32]; /* 32 is max size of property name */ + enum of_gpio_flags of_flags; + const of_find_gpio_quirk *q; + struct gpio_desc *desc; + unsigned int i; + + /* Try GPIO property "foo-gpios" and "foo-gpio" */ + for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { + if (con_id) + snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, + gpio_suffixes[i]); + else + snprintf(prop_name, sizeof(prop_name), "%s", + gpio_suffixes[i]); + + desc = of_get_named_gpiod_flags(np, prop_name, idx, &of_flags); + + if (!gpiod_not_found(desc)) + break; + } + + /* Properly named GPIO was not found, try workarounds */ + for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) + desc = (*q)(np, con_id, idx, &of_flags); + + if (IS_ERR(desc)) + return desc; + + *flags = of_convert_gpio_flags(of_flags); + + return desc; +} + +/** + * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API + * @np: device node to get GPIO from + * @chip: GPIO chip whose hog is parsed + * @idx: Index of the GPIO to parse + * @name: GPIO line name + * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from + * of_find_gpio() or of_parse_own_gpio() + * @dflags: gpiod_flags - optional GPIO initialization flags + * + * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno + * value on the error condition. + */ +static struct gpio_desc *of_parse_own_gpio(struct device_node *np, + struct gpio_chip *chip, + unsigned int idx, const char **name, + unsigned long *lflags, + enum gpiod_flags *dflags) +{ + struct device_node *chip_np; + enum of_gpio_flags xlate_flags; + struct of_phandle_args gpiospec; + struct gpio_desc *desc; + unsigned int i; + u32 tmp; + int ret; + + chip_np = dev_of_node(&chip->gpiodev->dev); + if (!chip_np) + return ERR_PTR(-EINVAL); + + xlate_flags = 0; + *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; + *dflags = GPIOD_ASIS; + + ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); + if (ret) + return ERR_PTR(ret); + + gpiospec.np = chip_np; + gpiospec.args_count = tmp; + + for (i = 0; i < tmp; i++) { + ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, + &gpiospec.args[i]); + if (ret) + return ERR_PTR(ret); + } + + desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); + if (IS_ERR(desc)) + return desc; + + *lflags = of_convert_gpio_flags(xlate_flags); + + if (of_property_read_bool(np, "input")) + *dflags |= GPIOD_IN; + else if (of_property_read_bool(np, "output-low")) + *dflags |= GPIOD_OUT_LOW; + else if (of_property_read_bool(np, "output-high")) + *dflags |= GPIOD_OUT_HIGH; + else { + pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", + desc_to_gpio(desc), np); + return ERR_PTR(-EINVAL); + } + + if (name && of_property_read_string(np, "line-name", name)) + *name = np->name; + + return desc; +} + +/** + * of_gpiochip_add_hog - Add all hogs in a hog device node + * @chip: gpio chip to act on + * @hog: device node describing the hogs + * + * Returns error if it fails otherwise 0 on success. + */ +static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) +{ + enum gpiod_flags dflags; + struct gpio_desc *desc; + unsigned long lflags; + const char *name; + unsigned int i; + int ret; + + for (i = 0;; i++) { + desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); + if (IS_ERR(desc)) + break; + + ret = gpiod_hog(desc, name, lflags, dflags); + if (ret < 0) + return ret; + +#ifdef CONFIG_OF_DYNAMIC + desc->hog = hog; +#endif + } + + return 0; +} + +/** + * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions + * @chip: gpio chip to act on + * + * This is only used by of_gpiochip_add to request/set GPIO initial + * configuration. + * It returns error if it fails otherwise 0 on success. + */ +static int of_gpiochip_scan_gpios(struct gpio_chip *chip) +{ + struct device_node *np; + int ret; + + for_each_available_child_of_node(dev_of_node(&chip->gpiodev->dev), np) { + if (!of_property_read_bool(np, "gpio-hog")) + continue; + + ret = of_gpiochip_add_hog(chip, np); + if (ret < 0) { + of_node_put(np); + return ret; + } + + of_node_set_flag(np, OF_POPULATED); + } + + return 0; +} + +#ifdef CONFIG_OF_DYNAMIC +/** + * of_gpiochip_remove_hog - Remove all hogs in a hog device node + * @chip: gpio chip to act on + * @hog: device node describing the hogs + */ +static void of_gpiochip_remove_hog(struct gpio_chip *chip, + struct device_node *hog) +{ + struct gpio_desc *desc; + + for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED) + if (desc->hog == hog) + gpiochip_free_own_desc(desc); +} + +static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) +{ + return device_match_of_node(&chip->gpiodev->dev, data); +} + +static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) +{ + return gpiochip_find(np, of_gpiochip_match_node); +} + +static int of_gpio_notify(struct notifier_block *nb, unsigned long action, + void *arg) +{ + struct of_reconfig_data *rd = arg; + struct gpio_chip *chip; + int ret; + + /* + * This only supports adding and removing complete gpio-hog nodes. + * Modifying an existing gpio-hog node is not supported (except for + * changing its "status" property, which is treated the same as + * addition/removal). + */ + switch (of_reconfig_get_state_change(action, arg)) { + case OF_RECONFIG_CHANGE_ADD: + if (!of_property_read_bool(rd->dn, "gpio-hog")) + return NOTIFY_OK; /* not for us */ + + if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + + chip = of_find_gpiochip_by_node(rd->dn->parent); + if (chip == NULL) + return NOTIFY_OK; /* not for us */ + + ret = of_gpiochip_add_hog(chip, rd->dn); + if (ret < 0) { + pr_err("%s: failed to add hogs for %pOF\n", __func__, + rd->dn); + of_node_clear_flag(rd->dn, OF_POPULATED); + return notifier_from_errno(ret); + } + break; + + case OF_RECONFIG_CHANGE_REMOVE: + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; /* already depopulated */ + + chip = of_find_gpiochip_by_node(rd->dn->parent); + if (chip == NULL) + return NOTIFY_OK; /* not for us */ + + of_gpiochip_remove_hog(chip, rd->dn); + of_node_clear_flag(rd->dn, OF_POPULATED); + break; + } + + return NOTIFY_OK; +} + +struct notifier_block gpio_of_notifier = { + .notifier_call = of_gpio_notify, +}; +#endif /* CONFIG_OF_DYNAMIC */ + +/** + * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags + * @gc: pointer to the gpio_chip structure + * @gpiospec: GPIO specifier as found in the device tree + * @flags: a flags pointer to fill in + * + * This is simple translation function, suitable for the most 1:1 mapped + * GPIO chips. This function performs only one sanity check: whether GPIO + * is less than ngpios (that is specified in the gpio_chip). + */ +static int of_gpio_simple_xlate(struct gpio_chip *gc, + const struct of_phandle_args *gpiospec, + u32 *flags) +{ + /* + * We're discouraging gpio_cells < 2, since that way you'll have to + * write your own xlate function (that will have to retrieve the GPIO + * number and the flags from a single gpio cell -- this is possible, + * but not recommended). + */ + if (gc->of_gpio_n_cells < 2) { + WARN_ON(1); + return -EINVAL; + } + + if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) + return -EINVAL; + + if (gpiospec->args[0] >= gc->ngpio) + return -EINVAL; + + if (flags) + *flags = gpiospec->args[1]; + + return gpiospec->args[0]; +} + +#if IS_ENABLED(CONFIG_OF_GPIO_MM_GPIOCHIP) +#include <linux/gpio/legacy-of-mm-gpiochip.h> +/** + * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) + * @np: device node of the GPIO chip + * @mm_gc: pointer to the of_mm_gpio_chip allocated structure + * @data: driver data to store in the struct gpio_chip + * + * To use this function you should allocate and fill mm_gc with: + * + * 1) In the gpio_chip structure: + * - all the callbacks + * - of_gpio_n_cells + * - of_xlate callback (optional) + * + * 3) In the of_mm_gpio_chip structure: + * - save_regs callback (optional) + * + * If succeeded, this function will map bank's memory and will + * do all necessary work for you. Then you'll able to use .regs + * to manage GPIOs from the callbacks. + */ +int of_mm_gpiochip_add_data(struct device_node *np, + struct of_mm_gpio_chip *mm_gc, + void *data) +{ + int ret = -ENOMEM; + struct gpio_chip *gc = &mm_gc->gc; + + gc->label = kasprintf(GFP_KERNEL, "%pOF", np); + if (!gc->label) + goto err0; + + mm_gc->regs = of_iomap(np, 0); + if (!mm_gc->regs) + goto err1; + + gc->base = -1; + + if (mm_gc->save_regs) + mm_gc->save_regs(mm_gc); + + fwnode_handle_put(mm_gc->gc.fwnode); + mm_gc->gc.fwnode = fwnode_handle_get(of_fwnode_handle(np)); + + ret = gpiochip_add_data(gc, data); + if (ret) + goto err2; + + return 0; +err2: + of_node_put(np); + iounmap(mm_gc->regs); +err1: + kfree(gc->label); +err0: + pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); + return ret; +} +EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data); + +/** + * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) + * @mm_gc: pointer to the of_mm_gpio_chip allocated structure + */ +void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) +{ + struct gpio_chip *gc = &mm_gc->gc; + + gpiochip_remove(gc); + iounmap(mm_gc->regs); + kfree(gc->label); +} +EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); +#endif + +#ifdef CONFIG_PINCTRL +static int of_gpiochip_add_pin_range(struct gpio_chip *chip) +{ + struct of_phandle_args pinspec; + struct pinctrl_dev *pctldev; + struct device_node *np; + int index = 0, ret; + const char *name; + static const char group_names_propname[] = "gpio-ranges-group-names"; + struct property *group_names; + + np = dev_of_node(&chip->gpiodev->dev); + if (!np) + return 0; + + group_names = of_find_property(np, group_names_propname, NULL); + + for (;; index++) { + ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, + index, &pinspec); + if (ret) + break; + + pctldev = of_pinctrl_get(pinspec.np); + of_node_put(pinspec.np); + if (!pctldev) + return -EPROBE_DEFER; + + if (pinspec.args[2]) { + if (group_names) { + of_property_read_string_index(np, + group_names_propname, + index, &name); + if (strlen(name)) { + pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", + np); + break; + } + } + /* npins != 0: linear range */ + ret = gpiochip_add_pin_range(chip, + pinctrl_dev_get_devname(pctldev), + pinspec.args[0], + pinspec.args[1], + pinspec.args[2]); + if (ret) + return ret; + } else { + /* npins == 0: special range */ + if (pinspec.args[1]) { + pr_err("%pOF: Illegal gpio-range format.\n", + np); + break; + } + + if (!group_names) { + pr_err("%pOF: GPIO group range requested but no %s property.\n", + np, group_names_propname); + break; + } + + ret = of_property_read_string_index(np, + group_names_propname, + index, &name); + if (ret) + break; + + if (!strlen(name)) { + pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", + np); + break; + } + + ret = gpiochip_add_pingroup_range(chip, pctldev, + pinspec.args[0], name); + if (ret) + return ret; + } + } + + return 0; +} + +#else +static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } +#endif + +int of_gpiochip_add(struct gpio_chip *chip) +{ + struct device_node *np; + int ret; + + np = dev_of_node(&chip->gpiodev->dev); + if (!np) + return 0; + + if (!chip->of_xlate) { + chip->of_gpio_n_cells = 2; + chip->of_xlate = of_gpio_simple_xlate; + } + + if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) + return -EINVAL; + + ret = of_gpiochip_add_pin_range(chip); + if (ret) + return ret; + + of_node_get(np); + + ret = of_gpiochip_scan_gpios(chip); + if (ret) + of_node_put(np); + + return ret; +} + +void of_gpiochip_remove(struct gpio_chip *chip) +{ + of_node_put(dev_of_node(&chip->gpiodev->dev)); +} |