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>
26 * This is Linux-specific flags. By default controllers' and Linux' mapping
27 * match, but GPIO controllers are free to translate their own flags to
28 * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
31 OF_GPIO_ACTIVE_LOW
= 0x1,
37 * OF GPIO chip for memory mapped banks
39 struct of_mm_gpio_chip
{
41 void (*save_regs
)(struct of_mm_gpio_chip
*mm_gc
);
45 static inline struct of_mm_gpio_chip
*to_of_mm_gpio_chip(struct gpio_chip
*gc
)
47 return container_of(gc
, struct of_mm_gpio_chip
, gc
);
50 extern int of_get_named_gpio_flags(struct device_node
*np
,
51 const char *list_name
, int index
, enum of_gpio_flags
*flags
);
53 extern int of_mm_gpiochip_add(struct device_node
*np
,
54 struct of_mm_gpio_chip
*mm_gc
);
55 extern void of_mm_gpiochip_remove(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 int of_gpio_simple_xlate(struct gpio_chip
*gc
,
60 const struct of_phandle_args
*gpiospec
,
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 int of_gpio_simple_xlate(struct gpio_chip
*gc
,
73 const struct of_phandle_args
*gpiospec
,
79 static inline void of_gpiochip_add(struct gpio_chip
*gc
) { }
80 static inline void of_gpiochip_remove(struct gpio_chip
*gc
) { }
82 #endif /* CONFIG_OF_GPIO */
85 * of_gpio_named_count() - Count GPIOs for a device
86 * @np: device node to count GPIOs for
87 * @propname: property name containing gpio specifier(s)
89 * The function returns the count of GPIOs specified for a node.
90 * Note that the empty GPIO specifiers count too. Returns either
91 * Number of gpios defined in property,
92 * -EINVAL for an incorrectly formed gpios property, or
93 * -ENOENT for a missing gpios property
101 * The above example defines four GPIOs, two of which are not specified.
102 * This function will return '4'
104 static inline int of_gpio_named_count(struct device_node
*np
, const char* propname
)
106 return of_count_phandle_with_args(np
, propname
, "#gpio-cells");
110 * of_gpio_count() - Count GPIOs for a device
111 * @np: device node to count GPIOs for
113 * Same as of_gpio_named_count, but hard coded to use the 'gpios' property
115 static inline int of_gpio_count(struct device_node
*np
)
117 return of_gpio_named_count(np
, "gpios");
120 static inline int of_get_gpio_flags(struct device_node
*np
, int index
,
121 enum of_gpio_flags
*flags
)
123 return of_get_named_gpio_flags(np
, "gpios", index
, flags
);
127 * of_get_named_gpio() - Get a GPIO number to use with GPIO API
128 * @np: device node to get GPIO from
129 * @propname: Name of property containing gpio specifier(s)
130 * @index: index of the GPIO
132 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
133 * value on the error condition.
135 static inline int of_get_named_gpio(struct device_node
*np
,
136 const char *propname
, int index
)
138 return of_get_named_gpio_flags(np
, propname
, index
, NULL
);
142 * of_get_gpio() - Get a GPIO number to use with GPIO API
143 * @np: device node to get GPIO from
144 * @index: index of the GPIO
146 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
147 * value on the error condition.
149 static inline int of_get_gpio(struct device_node
*np
, int index
)
151 return of_get_gpio_flags(np
, index
, NULL
);
154 #endif /* __LINUX_OF_GPIO_H */
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