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TOMOYO Linux Cross Reference
Linux/include/linux/of_gpio.h

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  1 /* SPDX-License-Identifier: GPL-2.0+ */
  2 /*
  3  * OF helpers for the GPIO API
  4  *
  5  * Copyright (c) 2007-2008  MontaVista Software, Inc.
  6  *
  7  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
  8  */
  9 
 10 #ifndef __LINUX_OF_GPIO_H
 11 #define __LINUX_OF_GPIO_H
 12 
 13 #include <linux/compiler.h>
 14 #include <linux/kernel.h>
 15 #include <linux/errno.h>
 16 #include <linux/gpio.h>
 17 #include <linux/of.h>
 18 
 19 struct device_node;
 20 
 21 /*
 22  * This is Linux-specific flags. By default controllers' and Linux' mapping
 23  * match, but GPIO controllers are free to translate their own flags to
 24  * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
 25  */
 26 enum of_gpio_flags {
 27         OF_GPIO_ACTIVE_LOW = 0x1,
 28         OF_GPIO_SINGLE_ENDED = 0x2,
 29         OF_GPIO_OPEN_DRAIN = 0x4,
 30         OF_GPIO_TRANSITORY = 0x8,
 31 };
 32 
 33 #ifdef CONFIG_OF_GPIO
 34 
 35 /*
 36  * OF GPIO chip for memory mapped banks
 37  */
 38 struct of_mm_gpio_chip {
 39         struct gpio_chip gc;
 40         void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
 41         void __iomem *regs;
 42 };
 43 
 44 static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
 45 {
 46         return container_of(gc, struct of_mm_gpio_chip, gc);
 47 }
 48 
 49 extern int of_get_named_gpio_flags(struct device_node *np,
 50                 const char *list_name, int index, enum of_gpio_flags *flags);
 51 
 52 extern int of_mm_gpiochip_add_data(struct device_node *np,
 53                                    struct of_mm_gpio_chip *mm_gc,
 54                                    void *data);
 55 static inline int of_mm_gpiochip_add(struct device_node *np,
 56                                      struct of_mm_gpio_chip *mm_gc)
 57 {
 58         return of_mm_gpiochip_add_data(np, mm_gc, NULL);
 59 }
 60 extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
 61 
 62 extern int of_gpio_simple_xlate(struct gpio_chip *gc,
 63                                 const struct of_phandle_args *gpiospec,
 64                                 u32 *flags);
 65 
 66 #else /* CONFIG_OF_GPIO */
 67 
 68 /* Drivers may not strictly depend on the GPIO support, so let them link. */
 69 static inline int of_get_named_gpio_flags(struct device_node *np,
 70                 const char *list_name, int index, enum of_gpio_flags *flags)
 71 {
 72         if (flags)
 73                 *flags = 0;
 74 
 75         return -ENOSYS;
 76 }
 77 
 78 static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
 79                                        const struct of_phandle_args *gpiospec,
 80                                        u32 *flags)
 81 {
 82         return -ENOSYS;
 83 }
 84 
 85 #endif /* CONFIG_OF_GPIO */
 86 
 87 /**
 88  * of_gpio_named_count() - Count GPIOs for a device
 89  * @np:         device node to count GPIOs for
 90  * @propname:   property name containing gpio specifier(s)
 91  *
 92  * The function returns the count of GPIOs specified for a node.
 93  * Note that the empty GPIO specifiers count too. Returns either
 94  *   Number of gpios defined in property,
 95  *   -EINVAL for an incorrectly formed gpios property, or
 96  *   -ENOENT for a missing gpios property
 97  *
 98  * Example:
 99  * gpios = <0
100  *          &gpio1 1 2
101  *          0
102  *          &gpio2 3 4>;
103  *
104  * The above example defines four GPIOs, two of which are not specified.
105  * This function will return '4'
106  */
107 static inline int of_gpio_named_count(struct device_node *np, const char* propname)
108 {
109         return of_count_phandle_with_args(np, propname, "#gpio-cells");
110 }
111 
112 /**
113  * of_gpio_count() - Count GPIOs for a device
114  * @np:         device node to count GPIOs for
115  *
116  * Same as of_gpio_named_count, but hard coded to use the 'gpios' property
117  */
118 static inline int of_gpio_count(struct device_node *np)
119 {
120         return of_gpio_named_count(np, "gpios");
121 }
122 
123 static inline int of_get_gpio_flags(struct device_node *np, int index,
124                       enum of_gpio_flags *flags)
125 {
126         return of_get_named_gpio_flags(np, "gpios", index, flags);
127 }
128 
129 /**
130  * of_get_named_gpio() - Get a GPIO number to use with GPIO API
131  * @np:         device node to get GPIO from
132  * @propname:   Name of property containing gpio specifier(s)
133  * @index:      index of the GPIO
134  *
135  * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
136  * value on the error condition.
137  */
138 static inline int of_get_named_gpio(struct device_node *np,
139                                    const char *propname, int index)
140 {
141         return of_get_named_gpio_flags(np, propname, index, NULL);
142 }
143 
144 /**
145  * of_get_gpio() - Get a GPIO number to use with GPIO API
146  * @np:         device node to get GPIO from
147  * @index:      index of the GPIO
148  *
149  * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
150  * value on the error condition.
151  */
152 static inline int of_get_gpio(struct device_node *np, int index)
153 {
154         return of_get_gpio_flags(np, index, NULL);
155 }
156 
157 #endif /* __LINUX_OF_GPIO_H */
158 

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