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1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * OF helpers for the GPIO API
5 * Copyright (c) 2007-2008 MontaVista Software, Inc.
7 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
10 #ifndef __LINUX_OF_GPIO_H
11 #define __LINUX_OF_GPIO_H
13 #include <linux/compiler.h>
14 #include <linux/gpio/driver.h>
15 #include <linux/gpio.h> /* FIXME: Shouldn't be here */
21 * This is Linux-specific flags. By default controllers' and Linux' mapping
22 * match, but GPIO controllers are free to translate their own flags to
23 * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
26 OF_GPIO_ACTIVE_LOW
= 0x1,
27 OF_GPIO_SINGLE_ENDED
= 0x2,
28 OF_GPIO_OPEN_DRAIN
= 0x4,
29 OF_GPIO_TRANSITORY
= 0x8,
30 OF_GPIO_PULL_UP
= 0x10,
31 OF_GPIO_PULL_DOWN
= 0x20,
36 #include <linux/kernel.h>
39 * OF GPIO chip for memory mapped banks
41 struct of_mm_gpio_chip
{
43 void (*save_regs
)(struct of_mm_gpio_chip
*mm_gc
);
47 static inline struct of_mm_gpio_chip
*to_of_mm_gpio_chip(struct gpio_chip
*gc
)
49 return container_of(gc
, struct of_mm_gpio_chip
, gc
);
52 extern int of_get_named_gpio_flags(struct device_node
*np
,
53 const char *list_name
, int index
, enum of_gpio_flags
*flags
);
55 extern int of_mm_gpiochip_add_data(struct device_node
*np
,
56 struct of_mm_gpio_chip
*mm_gc
,
58 static inline int of_mm_gpiochip_add(struct device_node
*np
,
59 struct of_mm_gpio_chip
*mm_gc
)
61 return of_mm_gpiochip_add_data(np
, mm_gc
, NULL
);
63 extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip
*mm_gc
);
65 #else /* CONFIG_OF_GPIO */
67 #include <linux/errno.h>
69 /* Drivers may not strictly depend on the GPIO support, so let them link. */
70 static inline int of_get_named_gpio_flags(struct device_node
*np
,
71 const char *list_name
, int index
, enum of_gpio_flags
*flags
)
79 #endif /* CONFIG_OF_GPIO */
82 * of_gpio_named_count() - Count GPIOs for a device
83 * @np: device node to count GPIOs for
84 * @propname: property name containing gpio specifier(s)
86 * The function returns the count of GPIOs specified for a node.
87 * Note that the empty GPIO specifiers count too. Returns either
88 * Number of gpios defined in property,
89 * -EINVAL for an incorrectly formed gpios property, or
90 * -ENOENT for a missing gpios property
98 * The above example defines four GPIOs, two of which are not specified.
99 * This function will return '4'
101 static inline int of_gpio_named_count(struct device_node
*np
, const char* propname
)
103 return of_count_phandle_with_args(np
, propname
, "#gpio-cells");
107 * of_gpio_count() - Count GPIOs for a device
108 * @np: device node to count GPIOs for
110 * Same as of_gpio_named_count, but hard coded to use the 'gpios' property
112 static inline int of_gpio_count(struct device_node
*np
)
114 return of_gpio_named_count(np
, "gpios");
117 static inline int of_get_gpio_flags(struct device_node
*np
, int index
,
118 enum of_gpio_flags
*flags
)
120 return of_get_named_gpio_flags(np
, "gpios", index
, flags
);
124 * of_get_named_gpio() - Get a GPIO number to use with GPIO API
125 * @np: device node to get GPIO from
126 * @propname: Name of property containing gpio specifier(s)
127 * @index: index of the GPIO
129 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
130 * value on the error condition.
132 static inline int of_get_named_gpio(struct device_node
*np
,
133 const char *propname
, int index
)
135 return of_get_named_gpio_flags(np
, propname
, index
, NULL
);
139 * of_get_gpio() - Get a GPIO number to use with GPIO API
140 * @np: device node to get GPIO from
141 * @index: index of the GPIO
143 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
144 * value on the error condition.
146 static inline int of_get_gpio(struct device_node
*np
, int index
)
148 return of_get_gpio_flags(np
, index
, NULL
);
151 #endif /* __LINUX_OF_GPIO_H */