Merge tag 'pinctrl-v3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...

[cascardo/linux.git] / drivers / gpio / devres.c

diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c
index 954b9f6..13dbd3d 100644 (file)
--- a/drivers/gpio/devres.c
+++ b/drivers/gpio/devres.c
@@ -108,6 +108,38 @@ struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev,
 }
 EXPORT_SYMBOL(__devm_gpiod_get_index);
 
+/**
+ * devm_get_gpiod_from_child - get a GPIO descriptor from a device's child node
+ * @dev:       GPIO consumer
+ * @child:     firmware node (child of @dev)
+ *
+ * GPIO descriptors returned from this function are automatically disposed on
+ * driver detach.
+ */
+struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
+                                           struct fwnode_handle *child)
+{
+       struct gpio_desc **dr;
+       struct gpio_desc *desc;
+
+       dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
+                         GFP_KERNEL);
+       if (!dr)
+               return ERR_PTR(-ENOMEM);
+
+       desc = fwnode_get_named_gpiod(child, "gpios");
+       if (IS_ERR(desc)) {
+               devres_free(dr);
+               return desc;
+       }
+
+       *dr = desc;
+       devres_add(dev, dr);
+
+       return desc;
+}
+EXPORT_SYMBOL(devm_get_gpiod_from_child);
+
 /**
  * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
  * @dev: GPIO consumer