From 863fbf4966a7ac301a4077e4a04d73e8abfdd7b2 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Fri, 11 Apr 2008 23:06:45 +1000 Subject: [POWERPC] OF helpers for the GPIO API 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 Acked-by: Grant Likely Signed-off-by: Paul Mackerras --- include/linux/of_gpio.h | 69 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 include/linux/of_gpio.h (limited to 'include/linux/of_gpio.h') diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h new file mode 100644 index 000000000000..2ee97e9877a7 --- /dev/null +++ b/include/linux/of_gpio.h @@ -0,0 +1,69 @@ +/* + * 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 +#include + +#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 */ -- cgit