phy: core: Add phy_get_by_of_node()

Add new function phy_get_by_of_node() allowing lookup of a phy by
device_node. Separates existing logic in _of_phy_get() into an internal
helper method _of_phy_get_with_args() to allow for reuse in new method.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260918-b4-linux-next-25-03-13-dtsi-x1e80100-camss-v20-2-dc244e124e71@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 65 insertions, 18 deletions

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 89addd732bff..42c27a2b4515 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -607,6 +607,38 @@ int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
 EXPORT_SYMBOL_GPL(phy_validate);
 
 /**
+ * _of_phy_get_with_args() - lookup and obtain a reference to a phy by of_phandle_args
+ * @args: of_phandle_args to the phy
+ *
+ * Returns: the phy from the provider's of_xlate, -ENODEV if disabled,
+ * -EPROBE_DEFER if the provider is not yet registered.
+ */
+static struct phy *_of_phy_get_with_args(struct of_phandle_args *args)
+{
+	struct phy *phy;
+	struct phy_provider *phy_provider;
+
+	lockdep_assert_held(&phy_provider_mutex);
+
+	phy_provider = of_phy_provider_lookup(args->np);
+	if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner))
+		return ERR_PTR(-EPROBE_DEFER);
+
+	if (!of_device_is_available(args->np)) {
+		dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
+		phy = ERR_PTR(-ENODEV);
+		goto out_put_module;
+	}
+
+	phy = phy_provider->of_xlate(phy_provider->dev, args);
+
+out_put_module:
+	module_put(phy_provider->owner);
+
+	return phy;
+}
+
+/**
  * _of_phy_get() - lookup and obtain a reference to a phy by phandle
  * @np: device_node for which to get the phy
  * @index: the index of the phy
@@ -620,8 +652,7 @@ EXPORT_SYMBOL_GPL(phy_validate);
 static struct phy *_of_phy_get(struct device_node *np, int index)
 {
 	int ret;
-	struct phy_provider *phy_provider;
-	struct phy *phy = NULL;
+	struct phy *phy;
 	struct of_phandle_args args;
 
 	lockdep_assert_held(&phy_provider_mutex);
@@ -637,22 +668,7 @@ static struct phy *_of_phy_get(struct device_node *np, int index)
 		goto out_put_node;
 	}
 
-	phy_provider = of_phy_provider_lookup(args.np);
-	if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
-		phy = ERR_PTR(-EPROBE_DEFER);
-		goto out_put_node;
-	}
-
-	if (!of_device_is_available(args.np)) {
-		dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
-		phy = ERR_PTR(-ENODEV);
-		goto out_put_module;
-	}
-
-	phy = phy_provider->of_xlate(phy_provider->dev, &args);
-
-out_put_module:
-	module_put(phy_provider->owner);
+	phy = _of_phy_get_with_args(&args);
 
 out_put_node:
 	of_node_put(args.np);
@@ -1002,6 +1018,37 @@ out_unlock:
 EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
 
 /**
+ * phy_get_by_of_node() - lookup and obtain a reference to a phy by device_node
+ * @np: node containing the phy
+ *
+ * Returns: the phy associated with the device node or ERR_PTR.
+ */
+struct phy *phy_get_by_of_node(struct device_node *np)
+{
+	struct of_phandle_args args = { .np = np, .args_count = 0 };
+	struct phy *phy;
+
+	mutex_lock(&phy_provider_mutex);
+
+	phy = _of_phy_get_with_args(&args);
+	if (IS_ERR(phy))
+		goto out_unlock;
+
+	if (!try_module_get(phy->ops->owner)) {
+		phy = ERR_PTR(-EPROBE_DEFER);
+		goto out_unlock;
+	}
+
+	get_device(&phy->dev);
+
+out_unlock:
+	mutex_unlock(&phy_provider_mutex);
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(phy_get_by_of_node);
+
+/**
  * phy_create() - create a new phy
  * @dev: device that is creating the new phy
  * @node: device node of the phy