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[POWERPC] OF helpers for the GPIO API

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This implements various helpers to support OF bindings for the GPIO
LIB API.

Previously this was PowerPC specific, but it seems this code isn't
arch-dependent anyhow, so let's place it into of/.

SPARC will not see this addition yet, real hardware seem to not use
GPIOs at all. But this might change:

   http://www.leox.org/docs/faq_MLleon.html

"16-bit I/O port" sounds promising. :-)

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Vorontsov 2008-04-11 23:06:45 +10:00 • committed by Paul Mackerras
parent a2879fef7c
commit 863fbf4966
4 changed files with 318 additions and 0 deletions
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69
include/linux/of_gpio.h Normal file
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/*
* 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 <asm/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 */