[PATCH v5 3/6] phy: add support for phy-supply

[Eugen Hristev]

Some phys require a phy-supply property that is a phandle to a regulator
that needs to be enabled for phy operations.
Implement basic supply lookup, enable and disabling, if DM_REGULATOR is
available.

[jonas at kwiboo.se:
use regulator_set_enable_if_allowed and disable if power_on ops fails]
Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
Signed-off-by: Eugen Hristev <eugen.hristev at collabora.com>
---
Changes in v5:
- add changes done by Jonas

 drivers/phy/phy-uclass.c | 51 +++++++++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 11 deletions(-)

diff --git a/drivers/phy/phy-uclass.c b/drivers/phy/phy-uclass.c
index 3fef5135a9cb..45ec1471d0ae 100644
--- a/drivers/phy/phy-uclass.c
+++ b/drivers/phy/phy-uclass.c
@@ -12,6 +12,7 @@
 #include <dm/devres.h>
 #include <generic-phy.h>
 #include <linux/list.h>
+#include <power/regulator.h>
 
 /**
  * struct phy_counts - Init and power-on counts of a single PHY port
@@ -29,12 +30,14 @@
  *              without a matching generic_phy_exit() afterwards
  * @list: Handle for a linked list of these structures corresponding to
  *        ports of the same PHY provider
+ * @supply: Handle to a phy-supply device
  */
 struct phy_counts {
 	unsigned long id;
 	int power_on_count;
 	int init_count;
 	struct list_head list;
+	struct udevice *supply;
 };
 
 static inline struct phy_ops *phy_dev_ops(struct udevice *dev)
@@ -58,7 +61,7 @@ static struct phy_counts *phy_get_counts(struct phy *phy)
 	return NULL;
 }
 
-static int phy_alloc_counts(struct phy *phy)
+static int phy_alloc_counts(struct phy *phy, struct udevice *supply)
 {
 	struct list_head *uc_priv;
 	struct phy_counts *counts;
@@ -76,6 +79,7 @@ static int phy_alloc_counts(struct phy *phy)
 	counts->id = phy->id;
 	counts->power_on_count = 0;
 	counts->init_count = 0;
+	counts->supply = supply;
 	list_add(&counts->list, uc_priv);
 
 	return 0;
@@ -123,7 +127,7 @@ int generic_phy_get_by_index_nodev(ofnode node, int index, struct phy *phy)
 {
 	struct ofnode_phandle_args args;
 	struct phy_ops *ops;
-	struct udevice *phydev;
+	struct udevice *phydev, *supply = NULL;
 	int i, ret;
 
 	debug("%s(node=%s, index=%d, phy=%p)\n",
@@ -172,7 +176,17 @@ int generic_phy_get_by_index_nodev(ofnode node, int index, struct phy *phy)
 		goto err;
 	}
 
-	ret = phy_alloc_counts(phy);
+	if (CONFIG_IS_ENABLED(DM_REGULATOR)) {
+		ret = device_get_supply_regulator(phydev, "phy-supply",
+						  &supply);
+		if (ret && ret != -ENOENT) {
+			debug("%s: device_get_supply_regulator failed: %d\n",
+			      __func__, ret);
+			goto err;
+		}
+	}
+
+	ret = phy_alloc_counts(phy, supply);
 	if (ret) {
 		debug("phy_alloc_counts() failed: %d\n", ret);
 		goto err;
@@ -300,14 +314,23 @@ int generic_phy_power_on(struct phy *phy)
 		return 0;
 	}
 
+	ret = regulator_set_enable_if_allowed(counts->supply, true);
+	if (ret && ret != -ENOSYS) {
+		dev_err(phy->dev, "PHY: Failed to enable regulator %s: %d.\n",
+			counts->supply->name, ret);
+		return ret;
+	}
+
 	ret = ops->power_on(phy);
-	if (ret)
+	if (ret) {
 		dev_err(phy->dev, "PHY: Failed to power on %s: %d.\n",
 			phy->dev->name, ret);
-	else
-		counts->power_on_count = 1;
+		regulator_set_enable_if_allowed(counts->supply, false);
+		return ret;
+	}
+	counts->power_on_count = 1;
 
-	return ret;
+	return 0;
 }
 
 int generic_phy_power_off(struct phy *phy)
@@ -331,13 +354,19 @@ int generic_phy_power_off(struct phy *phy)
 	}
 
 	ret = ops->power_off(phy);
-	if (ret)
+	if (ret) {
 		dev_err(phy->dev, "PHY: Failed to power off %s: %d.\n",
 			phy->dev->name, ret);
-	else
-		counts->power_on_count = 0;
+		return ret;
+	}
+	counts->power_on_count = 0;
 
-	return ret;
+	ret = regulator_set_enable_if_allowed(counts->supply, false);
+	if (ret && ret != -ENOSYS)
+		dev_err(phy->dev, "PHY: Failed to disable regulator %s: %d.\n",
+			counts->supply->name, ret);
+
+	return 0;
 }
 
 int generic_phy_configure(struct phy *phy, void *params)
-- 
2.34.1