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
/*
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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 <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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/errno.h>
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#include <linux/gpio.h>
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#ifdef CONFIG_OF_GPIO
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/*
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* Generic OF GPIO chip
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*/
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struct of_gpio_chip {
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struct gpio_chip gc;
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int gpio_cells;
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int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,
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const void *gpio_spec);
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};
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static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)
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{
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return container_of(gc, struct of_gpio_chip, gc);
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}
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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 of_gpio_chip of_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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struct of_gpio_chip *of_gc = to_of_gpio_chip(gc);
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return container_of(of_gc, struct of_mm_gpio_chip, of_gc);
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}
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extern int of_get_gpio(struct device_node *np, int index);
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extern int of_mm_gpiochip_add(struct device_node *np,
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struct of_mm_gpio_chip *mm_gc);
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extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,
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struct device_node *np,
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const void *gpio_spec);
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#else
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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_gpio(struct device_node *np, int index)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_OF_GPIO */
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#endif /* __LINUX_OF_GPIO_H */
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