gpio: Export gpiod_get_from_of_node()

This function already exist inside gpiolib, we were just
reluctant to make it available to the kernel at large as
the devm_* seemed to be enough for anyone.

However we found out that regulators need to do their own
lifecycle/refcounting on GPIO descriptors and explicitly
call gpiod_put() when done with a descriptor, so export
this function so we can hand the refcounting over to the
regulator core for these descriptors after retrieveal.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 087d865286a0c8ffe620c5abf33a14778a3f5e36..bc57f0dc59532f9c0d085e74b9ebc0f0e5bb6841 100644 (file)
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -201,12 +201,6 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
                                  struct gpio_array *array_info,
                                  unsigned long *value_bitmap);
 
-/* This is just passed between gpiolib and devres */
-struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
-                                        const char *propname, int index,
-                                        enum gpiod_flags dflags,
-                                        const char *label);
-
 extern struct spinlock gpio_lock;
 extern struct list_head gpio_devices;
 

diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index f2f887795d43e9ae2cbe8b15be896547dbebbb43..348885f2f3d3b92173f090bed2cb2649bf0f3d84 100644 (file)
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -172,6 +172,10 @@ int desc_to_gpio(const struct gpio_desc *desc);
 struct device_node;
 struct fwnode_handle;
 
+struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
+                                        const char *propname, int index,
+                                        enum gpiod_flags dflags,
+                                        const char *label);
 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
                                              struct device_node *node,
                                              const char *propname, int index,
@@ -517,6 +521,15 @@ static inline int desc_to_gpio(const struct gpio_desc *desc)
 struct device_node;
 struct fwnode_handle;
 
+static inline
+struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
+                                        const char *propname, int index,
+                                        enum gpiod_flags dflags,
+                                        const char *label)
+{
+       return ERR_PTR(-ENOSYS);
+}
+
 static inline
 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
                                              struct device_node *node,