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-rw-r--r--include/linux/of_gpio.h38
1 files changed, 34 insertions, 4 deletions
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index 67db101d0eb8..e25abf610cb6 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -14,9 +14,22 @@
14#ifndef __LINUX_OF_GPIO_H 14#ifndef __LINUX_OF_GPIO_H
15#define __LINUX_OF_GPIO_H 15#define __LINUX_OF_GPIO_H
16 16
17#include <linux/compiler.h>
18#include <linux/kernel.h>
17#include <linux/errno.h> 19#include <linux/errno.h>
18#include <linux/gpio.h> 20#include <linux/gpio.h>
19 21
22struct device_node;
23
24/*
25 * This is Linux-specific flags. By default controllers' and Linux' mapping
26 * match, but GPIO controllers are free to translate their own flags to
27 * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
28 */
29enum of_gpio_flags {
30 OF_GPIO_ACTIVE_LOW = 0x1,
31};
32
20#ifdef CONFIG_OF_GPIO 33#ifdef CONFIG_OF_GPIO
21 34
22/* 35/*
@@ -26,7 +39,7 @@ struct of_gpio_chip {
26 struct gpio_chip gc; 39 struct gpio_chip gc;
27 int gpio_cells; 40 int gpio_cells;
28 int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np, 41 int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,
29 const void *gpio_spec); 42 const void *gpio_spec, enum of_gpio_flags *flags);
30}; 43};
31 44
32static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc) 45static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)
@@ -50,20 +63,37 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
50 return container_of(of_gc, struct of_mm_gpio_chip, of_gc); 63 return container_of(of_gc, struct of_mm_gpio_chip, of_gc);
51} 64}
52 65
53extern int of_get_gpio(struct device_node *np, int index); 66extern int of_get_gpio_flags(struct device_node *np, int index,
67 enum of_gpio_flags *flags);
68
54extern int of_mm_gpiochip_add(struct device_node *np, 69extern int of_mm_gpiochip_add(struct device_node *np,
55 struct of_mm_gpio_chip *mm_gc); 70 struct of_mm_gpio_chip *mm_gc);
56extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, 71extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,
57 struct device_node *np, 72 struct device_node *np,
58 const void *gpio_spec); 73 const void *gpio_spec,
74 enum of_gpio_flags *flags);
59#else 75#else
60 76
61/* Drivers may not strictly depend on the GPIO support, so let them link. */ 77/* Drivers may not strictly depend on the GPIO support, so let them link. */
62static inline int of_get_gpio(struct device_node *np, int index) 78static inline int of_get_gpio_flags(struct device_node *np, int index,
79 enum of_gpio_flags *flags)
63{ 80{
64 return -ENOSYS; 81 return -ENOSYS;
65} 82}
66 83
67#endif /* CONFIG_OF_GPIO */ 84#endif /* CONFIG_OF_GPIO */
68 85
86/**
87 * of_get_gpio - Get a GPIO number to use with GPIO API
88 * @np: device node to get GPIO from
89 * @index: index of the GPIO
90 *
91 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
92 * value on the error condition.
93 */
94static inline int of_get_gpio(struct device_node *np, int index)
95{
96 return of_get_gpio_flags(np, index, NULL);
97}
98
69#endif /* __LINUX_OF_GPIO_H */ 99#endif /* __LINUX_OF_GPIO_H */