[PATCH 1/7] phy: Add devm_of_phy_optional_get() helper

[Geert Uytterhoeven <geert+renesas@glider.be>]

Add an optional variant of devm_of_phy_get(), so drivers no longer have
to open-code this operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/phy/phy-core.c  | 26 ++++++++++++++++++++++++++
 include/linux/phy/phy.h |  9 ++++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index d93ddf1262c5178b..ea009a611e19c705 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -879,6 +879,32 @@ struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_get);
 
+/**
+ * devm_of_phy_optional_get() - lookup and obtain a reference to an optional
+ * phy.
+ * @dev: device that requests this phy
+ * @np: node containing the phy
+ * @con_id: name of the phy from device's point of view
+ *
+ * Gets the phy using of_phy_get(), and associates a device with it using
+ * devres. On driver detach, release function is invoked on the devres data,
+ * then, devres data is freed.  This differs to devm_of_phy_get() in
+ * that if the phy does not exist, it is not considered an error and
+ * -ENODEV will not be returned. Instead the NULL phy is returned,
+ * which can be passed to all other phy consumer calls.
+ */
+struct phy *devm_of_phy_optional_get(struct device *dev, struct device_node *np,
+				     const char *con_id)
+{
+	struct phy *phy = devm_of_phy_get(dev, np, con_id);
+
+	if (PTR_ERR(phy) == -ENODEV)
+		phy = NULL;
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(devm_of_phy_optional_get);
+
 /**
  * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
  * @dev: device that requests this phy
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 559c3da515073697..5f6e669b616da0b0 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -255,6 +255,8 @@ struct phy *devm_phy_get(struct device *dev, const char *string);
 struct phy *devm_phy_optional_get(struct device *dev, const char *string);
 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
 			    const char *con_id);
+struct phy *devm_of_phy_optional_get(struct device *dev, struct device_node *np,
+				     const char *con_id);
 struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
 				     int index);
 void of_phy_put(struct phy *phy);
@@ -450,6 +452,13 @@ static inline struct phy *devm_of_phy_get(struct device *dev,
 	return ERR_PTR(-ENOSYS);
 }
 
+static inline struct phy *devm_of_phy_optional_get(struct device *dev,
+						   struct device_node *np,
+						   const char *con_id)
+{
+	return NULL;
+}
+
 static inline struct phy *devm_of_phy_get_by_index(struct device *dev,
 						   struct device_node *np,
 						   int index)
-- 
2.34.1