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* OF helpers for the GPIO API
* Copyright (c) 2007-2008 MontaVista Software, Inc.
* Author: Anton Vorontsov <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
#ifndef __LINUX_OF_GPIO_H
#define __LINUX_OF_GPIO_H
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/gpio.h>
struct device_node;
* 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 chip for memory mapped banks
struct of_mm_gpio_chip {
struct gpio_chip gc;
void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
void __iomem *regs;
static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
return container_of(gc, struct of_mm_gpio_chip, gc);
extern int of_get_gpio_flags(struct device_node *np, int index,
enum of_gpio_flags *flags);
extern unsigned int of_gpio_count(struct device_node *np);
extern int of_mm_gpiochip_add(struct device_node *np,
struct of_mm_gpio_chip *mm_gc);
extern void of_gpiochip_add(struct gpio_chip *gc);
extern void of_gpiochip_remove(struct gpio_chip *gc);
extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
#else /* CONFIG_OF_GPIO */
/* Drivers may not strictly depend on the GPIO support, so let them link. */
static inline int of_get_gpio_flags(struct device_node *np, int index,
enum of_gpio_flags *flags)
return -ENOSYS;
static inline unsigned int of_gpio_count(struct device_node *np)
return 0;
static inline void of_gpiochip_add(struct gpio_chip *gc) { }
static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
#endif /* CONFIG_OF_GPIO */
* of_get_gpio - Get a GPIO number to use with GPIO API
* @np: device node to get GPIO from
* @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.
static inline int of_get_gpio(struct device_node *np, int index)
return of_get_gpio_flags(np, index, NULL);
#endif /* __LINUX_OF_GPIO_H */