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-rw-r--r--include/linux/of_gpio.h38
1 files changed, 34 insertions, 4 deletions
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index 67db101d0eb..e25abf610cb 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -14,9 +14,22 @@
#ifndef __LINUX_OF_GPIO_H
#define __LINUX_OF_GPIO_H
+#include <linux/compiler.h>
+#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/gpio.h>
+struct device_node;
+
+/*
+ * This is Linux-specific flags. By default controllers' and Linux' mapping
+ * match, but GPIO controllers are free to translate their own flags to
+ * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
+ */
+enum of_gpio_flags {
+ OF_GPIO_ACTIVE_LOW = 0x1,
+};
+
#ifdef CONFIG_OF_GPIO
/*
@@ -26,7 +39,7 @@ struct of_gpio_chip {
struct gpio_chip gc;
int gpio_cells;
int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,
- const void *gpio_spec);
+ const void *gpio_spec, enum of_gpio_flags *flags);
};
static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)
@@ -50,20 +63,37 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
return container_of(of_gc, struct of_mm_gpio_chip, of_gc);
}
-extern int of_get_gpio(struct device_node *np, int index);
+extern int of_get_gpio_flags(struct device_node *np, int index,
+ enum of_gpio_flags *flags);
+
extern int of_mm_gpiochip_add(struct device_node *np,
struct of_mm_gpio_chip *mm_gc);
extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,
struct device_node *np,
- const void *gpio_spec);
+ const void *gpio_spec,
+ enum of_gpio_flags *flags);
#else
/* Drivers may not strictly depend on the GPIO support, so let them link. */
-static inline int of_get_gpio(struct device_node *np, int index)
+static inline int of_get_gpio_flags(struct device_node *np, int index,
+ enum of_gpio_flags *flags)
{
return -ENOSYS;
}
#endif /* CONFIG_OF_GPIO */
+/**
+ * of_get_gpio - Get a GPIO number to use with GPIO API
+ * @np: device node to get GPIO from
+ * @index: index of the GPIO
+ *
+ * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * value on the error condition.
+ */
+static inline int of_get_gpio(struct device_node *np, int index)
+{
+ return of_get_gpio_flags(np, index, NULL);
+}
+
#endif /* __LINUX_OF_GPIO_H */