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/gpio/driver.h>
15 #include <linux/gpio.h> /* FIXME: Shouldn't be here */
16 #include <linux/of.h>
17
18 struct device_node;
19
20 #ifdef CONFIG_OF_GPIO
21
22 #include <linux/container_of.h>
23
24 /*
25 * OF GPIO chip for memory mapped banks
26 */
27 struct of_mm_gpio_chip {
28 struct gpio_chip gc;
29 void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
30 void __iomem *regs;
31 };
32
to_of_mm_gpio_chip(struct gpio_chip * gc)33 static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
34 {
35 return container_of(gc, struct of_mm_gpio_chip, gc);
36 }
37
38 extern int of_get_named_gpio(const struct device_node *np,
39 const char *list_name, int index);
40
41 extern int of_mm_gpiochip_add_data(struct device_node *np,
42 struct of_mm_gpio_chip *mm_gc,
43 void *data);
44 extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
45
46 #else /* CONFIG_OF_GPIO */
47
48 #include <linux/errno.h>
49
50 /* Drivers may not strictly depend on the GPIO support, so let them link. */
of_get_named_gpio(const struct device_node * np,const char * propname,int index)51 static inline int of_get_named_gpio(const struct device_node *np,
52 const char *propname, int index)
53 {
54 return -ENOSYS;
55 }
56
57 #endif /* CONFIG_OF_GPIO */
58
59 #endif /* __LINUX_OF_GPIO_H */
60