mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
18ad7a61e1
Since commit 7560fa60fc (gpio: <linux/gpio.h>
and "no GPIO support here" stubs) drivers can use GPIOs if they're available,
but don't require them.
This patch actually enables this feature.
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
* OF helpers for the GPIO API
|
|
*
|
|
* Copyright (c) 2007-2008 MontaVista Software, Inc.
|
|
*
|
|
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
|
|
*
|
|
* 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/errno.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#ifdef CONFIG_OF_GPIO
|
|
|
|
/*
|
|
* Generic OF GPIO chip
|
|
*/
|
|
struct of_gpio_chip {
|
|
struct gpio_chip gc;
|
|
int gpio_cells;
|
|
int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,
|
|
const void *gpio_spec);
|
|
};
|
|
|
|
static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)
|
|
{
|
|
return container_of(gc, struct of_gpio_chip, gc);
|
|
}
|
|
|
|
/*
|
|
* OF GPIO chip for memory mapped banks
|
|
*/
|
|
struct of_mm_gpio_chip {
|
|
struct of_gpio_chip of_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)
|
|
{
|
|
struct of_gpio_chip *of_gc = to_of_gpio_chip(gc);
|
|
|
|
return container_of(of_gc, struct of_mm_gpio_chip, of_gc);
|
|
}
|
|
|
|
extern int of_get_gpio(struct device_node *np, int index);
|
|
extern int of_mm_gpiochip_add(struct device_node *np,
|
|
struct of_mm_gpio_chip *mm_gc);
|
|
extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,
|
|
struct device_node *np,
|
|
const void *gpio_spec);
|
|
#else
|
|
|
|
/* Drivers may not strictly depend on the GPIO support, so let them link. */
|
|
static inline int of_get_gpio(struct device_node *np, int index)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* CONFIG_OF_GPIO */
|
|
|
|
#endif /* __LINUX_OF_GPIO_H */
|