gpiolib: introduce devm_fwnode_gpiod_get_index()

devm_fwnode_get_index_gpiod_from_child() is too long, besides the fwnode
in question does not have to be a child of device node. Let's rename it
to devm_fwnode_gpiod_get_index() and keep the old name for compatibility
for now.

Also let's add a devm_fwnode_gpiod_get() wrapper as majority of the
callers need a single GPIO.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20190913032240.50333-2-dmitry.torokhov@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-devres.c

@@ -185,12 +185,11 @@ struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
 EXPORT_SYMBOL_GPL(devm_gpiod_get_from_of_node);
 
 /**
- * devm_fwnode_get_index_gpiod_from_child - get a GPIO descriptor from a
- *					    device's child node
+ * devm_fwnode_gpiod_get_index - get a GPIO descriptor from a given node
  * @dev:	GPIO consumer
+ * @fwnode:	firmware node containing GPIO reference
  * @con_id:	function within the GPIO consumer
  * @index:	index of the GPIO to obtain in the consumer
- * @child:	firmware node (child of @dev)
  * @flags:	GPIO initialization flags
  * @label:	label to attach to the requested GPIO
  *
@@ -200,11 +199,11 @@ EXPORT_SYMBOL_GPL(devm_gpiod_get_from_of_node);
  * On successful request the GPIO pin is configured in accordance with
  * provided @flags.
  */
-struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
-						const char *con_id, int index,
-						struct fwnode_handle *child,
-						enum gpiod_flags flags,
-						const char *label)
+struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
+					      struct fwnode_handle *fwnode,
+					      const char *con_id, int index,
+					      enum gpiod_flags flags,
+					      const char *label)
 {
 	char prop_name[32]; /* 32 is max size of property name */
 	struct gpio_desc **dr;
@@ -224,7 +223,7 @@ struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
 			snprintf(prop_name, sizeof(prop_name), "%s",
 					    gpio_suffixes[i]);
 
-		desc = fwnode_get_named_gpiod(child, prop_name, index, flags,
+		desc = fwnode_get_named_gpiod(fwnode, prop_name, index, flags,
 					      label);
 		if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
 			break;
@@ -239,7 +238,7 @@ struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
 
 	return desc;
 }
-EXPORT_SYMBOL_GPL(devm_fwnode_get_index_gpiod_from_child);
+EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_index);
 
 /**
  * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()

include/linux/gpio/consumer.h

@@ -176,11 +176,11 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
 					 const char *propname, int index,
 					 enum gpiod_flags dflags,
 					 const char *label);
-struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
-						const char *con_id, int index,
-						struct fwnode_handle *child,
-						enum gpiod_flags flags,
-						const char *label);
+struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
+					      struct fwnode_handle *child,
+					      const char *con_id, int index,
+					      enum gpiod_flags flags,
+					      const char *label);
 
 #else /* CONFIG_GPIOLIB */
 
@@ -531,6 +531,29 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
 	return ERR_PTR(-ENOSYS);
 }
 
+static inline
+struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
+					      struct fwnode_handle *fwnode,
+					      const char *con_id, int index,
+					      enum gpiod_flags flags,
+					      const char *label)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+#endif /* CONFIG_GPIOLIB */
+
+static inline
+struct gpio_desc *devm_fwnode_gpiod_get(struct device *dev,
+					struct fwnode_handle *fwnode,
+					const char *con_id,
+					enum gpiod_flags flags,
+					const char *label)
+{
+	return devm_fwnode_gpiod_get_index(dev, fwnode, con_id, 0,
+					   flags, label);
+}
+
 static inline
 struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
 						const char *con_id, int index,
@@ -538,11 +561,10 @@ struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
 						enum gpiod_flags flags,
 						const char *label)
 {
-	return ERR_PTR(-ENOSYS);
+	return devm_fwnode_gpiod_get_index(dev, child, con_id, index,
+					   flags, label);
 }
 
-#endif /* CONFIG_GPIOLIB */
-
 static inline
 struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
 						   const char *con_id,
@@ -550,8 +572,7 @@ struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
 						   enum gpiod_flags flags,
 						   const char *label)
 {
-	return devm_fwnode_get_index_gpiod_from_child(dev, con_id, 0, child,
-						      flags, label);
+	return devm_fwnode_gpiod_get_index(dev, child, con_id, 0, flags, label);
 }
 
 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_OF_GPIO)