linux-kernel - [PATCH v2 2/4] phy: qcom-ufs: Correct usage of regulator

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Date:   Sun, 22 Jan 2017 13:17:47 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2 2/4] phy: qcom-ufs: Correct usage of regulator_get()

When regulator_get() tries to resolve a regulator supply but fail to
find a matching property in DeviceTree it returns a dummy regulator, if
a matching supply is specified but unavailable the regulator core will
return an error.

Based on this we should not ignore errors upon failing to acquire the
optional "vddp-ref-clk" supply.

Reviewed-by: Vivek Gautam <vivek.gautam@...eaurora.org>
Reviewed-by: Subhash Jadavani <subhashj@...eaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes since v1:
- Picked up reviewd-bys from Vivek and Subhash

 drivers/phy/phy-qcom-ufs.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/phy/phy-qcom-ufs.c b/drivers/phy/phy-qcom-ufs.c
index 4d7f3c018223..bbd317158084 100644
--- a/drivers/phy/phy-qcom-ufs.c
+++ b/drivers/phy/phy-qcom-ufs.c
@@ -210,8 +210,9 @@ int ufs_qcom_phy_init_clks(struct ufs_qcom_phy *phy_common)
 }
 EXPORT_SYMBOL_GPL(ufs_qcom_phy_init_clks);
 
-static int __ufs_qcom_phy_init_vreg(struct device *dev,
-		struct ufs_qcom_phy_vreg *vreg, const char *name, bool optional)
+static int ufs_qcom_phy_init_vreg(struct device *dev,
+				  struct ufs_qcom_phy_vreg *vreg,
+				  const char *name)
 {
 	int err = 0;
 
@@ -221,9 +222,7 @@ static int __ufs_qcom_phy_init_vreg(struct device *dev,
 	vreg->reg = devm_regulator_get(dev, name);
 	if (IS_ERR(vreg->reg)) {
 		err = PTR_ERR(vreg->reg);
-		vreg->reg = NULL;
-		if (!optional)
-			dev_err(dev, "failed to get %s, %d\n", name, err);
+		dev_err(dev, "failed to get %s, %d\n", name, err);
 		goto out;
 	}
 
@@ -263,12 +262,6 @@ static int __ufs_qcom_phy_init_vreg(struct device *dev,
 	return err;
 }
 
-static int ufs_qcom_phy_init_vreg(struct device *dev,
-			struct ufs_qcom_phy_vreg *vreg, const char *name)
-{
-	return __ufs_qcom_phy_init_vreg(dev, vreg, name, false);
-}
-
 int ufs_qcom_phy_init_vregulators(struct ufs_qcom_phy *phy_common)
 {
 	int err;
@@ -284,9 +277,9 @@ int ufs_qcom_phy_init_vregulators(struct ufs_qcom_phy *phy_common)
 	if (err)
 		goto out;
 
-	/* vddp-ref-clk-* properties are optional */
-	__ufs_qcom_phy_init_vreg(phy_common->dev, &phy_common->vddp_ref_clk,
-				 "vddp-ref-clk", true);
+	err = ufs_qcom_phy_init_vreg(phy_common->dev, &phy_common->vddp_ref_clk,
+				     "vddp-ref-clk");
+
 out:
 	return err;
 }
-- 
2.11.0