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 <[email protected]> 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 /* 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. 24 */ 25 enum of_gpio_flags { 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, 32 OF_GPIO_PULL_DISABLE = 0x40, 33 }; 34 35 #ifdef CONFIG_OF_GPIO 36 37 #include <linux/container_of.h> 38 39 /* 40 * OF GPIO chip for memory mapped banks 41 */ 42 struct of_mm_gpio_chip { 43 struct gpio_chip gc; 44 void (*save_regs)(struct of_mm_gpio_chip *mm_gc); 45 void __iomem *regs; 46 }; 47 48 static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) 49 { 50 return container_of(gc, struct of_mm_gpio_chip, gc); 51 } 52 53 extern int of_get_named_gpio(const struct device_node *np, 54 const char *list_name, int index); 55 56 extern int of_mm_gpiochip_add_data(struct device_node *np, 57 struct of_mm_gpio_chip *mm_gc, 58 void *data); 59 static inline int of_mm_gpiochip_add(struct device_node *np, 60 struct of_mm_gpio_chip *mm_gc) 61 { 62 return of_mm_gpiochip_add_data(np, mm_gc, NULL); 63 } 64 extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc); 65 66 #else /* CONFIG_OF_GPIO */ 67 68 #include <linux/errno.h> 69 70 /* Drivers may not strictly depend on the GPIO support, so let them link. */ 71 static inline int of_get_named_gpio(const struct device_node *np, 72 const char *propname, int index) 73 { 74 return -ENOSYS; 75 } 76 77 #endif /* CONFIG_OF_GPIO */ 78 79 #endif /* __LINUX_OF_GPIO_H */ 80