phy: Introduce of_phy_get_by_phandle

Currently generic phy support assumes that the standard phy binding from
dts/Bindings/phy/phy-bindings.txt is used. This adds a helper function
which can be used to retrieve a phy when this standard binding is not
used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 67af14f680..7c1f3d440b 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -268,6 +268,42 @@ struct phy *of_phy_get(struct device_node *np, const char *con_id)
 }
 
 /**
+ * of_phy_get_by_phandle() - lookup and obtain a reference to a phy.
+ * @dev: device that requests this phy
+ * @phandle - name of the property holding the phy phandle value
+ * @index - the index of the phy
+ *
+ * Returns the phy driver, after getting a refcount to it; or
+ * -ENODEV if there is no such phy. The caller is responsible for
+ * calling phy_put() to release that count.
+ */
+struct phy *of_phy_get_by_phandle(struct device_d *dev, const char *phandle,
+				  u8 index)
+{
+	struct device_node *np;
+	struct phy_provider *phy_provider;
+
+	if (!dev->device_node) {
+		dev_dbg(dev, "device does not have a device node entry\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	np = of_parse_phandle(dev->device_node, phandle, index);
+	if (!np) {
+		dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
+			dev->device_node->full_name);
+		return ERR_PTR(-ENODEV);
+	}
+
+	phy_provider = of_phy_provider_lookup(np);
+	if (IS_ERR(phy_provider)) {
+		return ERR_PTR(-ENODEV);
+	}
+
+	return phy_provider->of_xlate(phy_provider->dev, NULL);
+}
+
+/**
  * phy_get() - lookup and obtain a reference to a phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or the name of the controller