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151 lines
4.0 KiB
151 lines
4.0 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* OF helpers for the GPIO API |
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* |
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* Copyright (c) 2007-2008 MontaVista Software, Inc. |
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* |
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* Author: Anton Vorontsov <[email protected]> |
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*/ |
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#ifndef __LINUX_OF_GPIO_H |
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#define __LINUX_OF_GPIO_H |
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#include <linux/compiler.h> |
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#include <linux/gpio/driver.h> |
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#include <linux/gpio.h> /* FIXME: Shouldn't be here */ |
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#include <linux/of.h> |
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struct device_node; |
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/* |
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* This is Linux-specific flags. By default controllers' and Linux' mapping |
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* match, but GPIO controllers are free to translate their own flags to |
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* Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended. |
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*/ |
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enum of_gpio_flags { |
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OF_GPIO_ACTIVE_LOW = 0x1, |
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OF_GPIO_SINGLE_ENDED = 0x2, |
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OF_GPIO_OPEN_DRAIN = 0x4, |
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OF_GPIO_TRANSITORY = 0x8, |
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OF_GPIO_PULL_UP = 0x10, |
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OF_GPIO_PULL_DOWN = 0x20, |
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}; |
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#ifdef CONFIG_OF_GPIO |
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#include <linux/kernel.h> |
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/* |
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* OF GPIO chip for memory mapped banks |
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*/ |
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struct of_mm_gpio_chip { |
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struct gpio_chip gc; |
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void (*save_regs)(struct of_mm_gpio_chip *mm_gc); |
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void __iomem *regs; |
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}; |
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static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) |
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{ |
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return container_of(gc, struct of_mm_gpio_chip, gc); |
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} |
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extern int of_get_named_gpio_flags(struct device_node *np, |
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const char *list_name, int index, enum of_gpio_flags *flags); |
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extern int of_mm_gpiochip_add_data(struct device_node *np, |
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struct of_mm_gpio_chip *mm_gc, |
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void *data); |
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static inline int of_mm_gpiochip_add(struct device_node *np, |
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struct of_mm_gpio_chip *mm_gc) |
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{ |
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return of_mm_gpiochip_add_data(np, mm_gc, NULL); |
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} |
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extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc); |
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#else /* CONFIG_OF_GPIO */ |
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#include <linux/errno.h> |
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/* Drivers may not strictly depend on the GPIO support, so let them link. */ |
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static inline int of_get_named_gpio_flags(struct device_node *np, |
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const char *list_name, int index, enum of_gpio_flags *flags) |
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{ |
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if (flags) |
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*flags = 0; |
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return -ENOSYS; |
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} |
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#endif /* CONFIG_OF_GPIO */ |
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/** |
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* of_gpio_named_count() - Count GPIOs for a device |
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* @np: device node to count GPIOs for |
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* @propname: property name containing gpio specifier(s) |
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* |
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* The function returns the count of GPIOs specified for a node. |
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* Note that the empty GPIO specifiers count too. Returns either |
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* Number of gpios defined in property, |
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* -EINVAL for an incorrectly formed gpios property, or |
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* -ENOENT for a missing gpios property |
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* |
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* Example: |
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* gpios = <0 |
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* &gpio1 1 2 |
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* 0 |
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* &gpio2 3 4>; |
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* |
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* The above example defines four GPIOs, two of which are not specified. |
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* This function will return '4' |
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*/ |
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static inline int of_gpio_named_count(struct device_node *np, const char* propname) |
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{ |
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return of_count_phandle_with_args(np, propname, "#gpio-cells"); |
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} |
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/** |
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* of_gpio_count() - Count GPIOs for a device |
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* @np: device node to count GPIOs for |
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* |
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* Same as of_gpio_named_count, but hard coded to use the 'gpios' property |
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*/ |
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static inline int of_gpio_count(struct device_node *np) |
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{ |
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return of_gpio_named_count(np, "gpios"); |
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} |
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static inline int of_get_gpio_flags(struct device_node *np, int index, |
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enum of_gpio_flags *flags) |
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{ |
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return of_get_named_gpio_flags(np, "gpios", index, flags); |
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} |
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/** |
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* of_get_named_gpio() - Get a GPIO number to use with GPIO API |
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* @np: device node to get GPIO from |
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* @propname: Name of property containing gpio specifier(s) |
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* @index: index of the GPIO |
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* |
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* Returns GPIO number to use with Linux generic GPIO API, or one of the errno |
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* value on the error condition. |
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*/ |
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static inline int of_get_named_gpio(struct device_node *np, |
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const char *propname, int index) |
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{ |
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return of_get_named_gpio_flags(np, propname, index, NULL); |
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} |
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/** |
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* of_get_gpio() - Get a GPIO number to use with GPIO API |
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* @np: device node to get GPIO from |
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* @index: index of the GPIO |
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* |
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* Returns GPIO number to use with Linux generic GPIO API, or one of the errno |
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* value on the error condition. |
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*/ |
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static inline int of_get_gpio(struct device_node *np, int index) |
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{ |
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return of_get_gpio_flags(np, index, NULL); |
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} |
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#endif /* __LINUX_OF_GPIO_H */
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