From: Dong Aisheng <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
---
drivers/gpio/gpiolib-of.c | 11 +++++++++++
include/linux/of_gpio.h | 5 +++++
2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 8389d4a..b8010a9 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -234,3 +234,14 @@ void of_gpiochip_remove(struct gpio_chip *chip)
if (chip->of_node)
of_node_put(chip->of_node);
}
+
+/* Private function for resolving node pointer to gpio_chip */
+static int of_gpiochip_is_match(struct gpio_chip *chip, void *data)
+{
+ return chip->of_node == data;
+}
+
+struct gpio_chip *of_node_to_gpiochip(struct device_node *np)
+{
+ return gpiochip_find(np, of_gpiochip_is_match);
+}
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index c454f57..880783b 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -61,6 +61,7 @@ extern void of_gpiochip_remove(struct gpio_chip *gc);
extern int of_gpio_simple_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec,
u32 *flags);
+extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
#else /* CONFIG_OF_GPIO */
@@ -84,6 +85,10 @@ static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
return -ENOSYS;
}
+static struct gpio_chip *of_node_to_gpiochip(struct device_node *np)
+{
+ return NULL;
+}
static inline void of_gpiochip_add(struct gpio_chip *gc) { }
static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
--
1.7.0.4
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