linux-kernel - [PATCH 07/15 v3] gpio: Export gpiod_get_from_of

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Date:   Wed,  5 Dec 2018 13:47:13 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 07/15 v3] 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@...aro.org>
---
ChangeLog v2->v3:
- Resending.
ChangeLog v1->v2:
- Resending
---
 drivers/gpio/gpiolib.h        |  6 ------
 include/linux/gpio/consumer.h | 13 +++++++++++++
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 087d865286a0..bc57f0dc5953 100644
--- 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 f2f887795d43..348885f2f3d3 100644
--- 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,
-- 
2.19.2