2 * OF helpers for the GPIO API
4 * Copyright (c) 2007-2008 MontaVista Software, Inc.
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #ifndef __LINUX_OF_GPIO_H
15 #define __LINUX_OF_GPIO_H
17 #include <linux/compiler.h>
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/gpio.h>
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.
30 OF_GPIO_ACTIVE_LOW
= 0x1,
36 * OF GPIO chip for memory mapped banks
38 struct of_mm_gpio_chip
{
40 void (*save_regs
)(struct of_mm_gpio_chip
*mm_gc
);
44 static inline struct of_mm_gpio_chip
*to_of_mm_gpio_chip(struct gpio_chip
*gc
)
46 return container_of(gc
, struct of_mm_gpio_chip
, gc
);
49 extern int of_get_named_gpio_flags(struct device_node
*np
,
50 const char *list_name
, int index
, enum of_gpio_flags
*flags
);
52 extern unsigned int of_gpio_count(struct device_node
*np
);
54 extern int of_mm_gpiochip_add(struct device_node
*np
,
55 struct of_mm_gpio_chip
*mm_gc
);
57 extern void of_gpiochip_add(struct gpio_chip
*gc
);
58 extern void of_gpiochip_remove(struct gpio_chip
*gc
);
59 extern struct gpio_chip
*of_node_to_gpiochip(struct device_node
*np
);
60 extern int of_gpio_simple_xlate(struct gpio_chip
*gc
, struct device_node
*np
,
61 const void *gpio_spec
, u32
*flags
);
63 #else /* CONFIG_OF_GPIO */
65 /* Drivers may not strictly depend on the GPIO support, so let them link. */
66 static inline int of_get_named_gpio_flags(struct device_node
*np
,
67 const char *list_name
, int index
, enum of_gpio_flags
*flags
)
72 static inline unsigned int of_gpio_count(struct device_node
*np
)
77 static inline int of_gpio_simple_xlate(struct gpio_chip
*gc
,
78 struct device_node
*np
,
79 const void *gpio_spec
, u32
*flags
)
84 static inline void of_gpiochip_add(struct gpio_chip
*gc
) { }
85 static inline void of_gpiochip_remove(struct gpio_chip
*gc
) { }
87 #endif /* CONFIG_OF_GPIO */
90 * of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API
91 * @np: device node to get GPIO from
92 * @index: index of the GPIO
93 * @flags: a flags pointer to fill in
95 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
96 * value on the error condition. If @flags is not NULL the function also fills
97 * in flags for the GPIO.
99 static inline int of_get_gpio_flags(struct device_node
*np
, int index
,
100 enum of_gpio_flags
*flags
)
102 return of_get_named_gpio_flags(np
, "gpios", index
, flags
);
106 * of_get_named_gpio() - Get a GPIO number to use with GPIO API
107 * @np: device node to get GPIO from
108 * @propname: Name of property containing gpio specifier(s)
109 * @index: index of the GPIO
111 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
112 * value on the error condition.
114 static inline int of_get_named_gpio(struct device_node
*np
,
115 const char *propname
, int index
)
117 return of_get_named_gpio_flags(np
, propname
, index
, NULL
);
121 * of_get_gpio() - Get a GPIO number to use with GPIO API
122 * @np: device node to get GPIO from
123 * @index: index of the GPIO
125 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
126 * value on the error condition.
128 static inline int of_get_gpio(struct device_node
*np
, int index
)
130 return of_get_gpio_flags(np
, index
, NULL
);
133 #endif /* __LINUX_OF_GPIO_H */
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