[PATCH v4 1/8] scsi: ufs: ufs-mediatek: Remove useless mediatek,ufs-support-va09 property

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Remove checking the mediatek,ufs-support-va09 property to decide
whether to try to support the VA09 regulator handling and change
the ufs_mtk_init_va09_pwr_ctrl() function to make it call
devm_regulator_get_optional(): if the regulator is present, then
we set the UFS_MTK_CAP_VA09_PWR_CTRL, effectively enabling the
handling of the VA09 regulator based on that.

Also, make sure to pass the return value of the call to
devm_regulator_get_optional() to the probe function, so that
if it returns a probe deferral, the appropriate action will be
taken.

While at it, remove the error print (disguised as info...) when
the va09 regulator was not found.

Fixes: ac8c2459091c ("scsi: ufs-mediatek: Decouple features from platform bindings")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/ufs/host/ufs-mediatek.c | 34 +++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 0b0c923b1d7b..e4643ac49033 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -622,27 +622,38 @@ static void ufs_mtk_init_boost_crypt(struct ufs_hba *hba)
 	return;
 }
 
-static void ufs_mtk_init_va09_pwr_ctrl(struct ufs_hba *hba)
+static int ufs_mtk_init_va09_pwr_ctrl(struct ufs_hba *hba)
 {
 	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+	int ret;
 
-	host->reg_va09 = regulator_get(hba->dev, "va09");
-	if (IS_ERR(host->reg_va09))
-		dev_info(hba->dev, "failed to get va09");
-	else
-		host->caps |= UFS_MTK_CAP_VA09_PWR_CTRL;
+	host->reg_va09 = devm_regulator_get_optional(hba->dev, "va09");
+	if (IS_ERR(host->reg_va09)) {
+		ret = PTR_ERR(host->reg_va09);
+
+		/* Return an error only if this is a deferral */
+		if (ret == -EPROBE_DEFER)
+			return ret;
+
+		return 0;
+	}
+
+	host->caps |= UFS_MTK_CAP_VA09_PWR_CTRL;
+	return 0;
 }
 
-static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
+static int ufs_mtk_init_host_caps(struct ufs_hba *hba)
 {
 	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
 	struct device_node *np = hba->dev->of_node;
+	int ret;
 
 	if (of_property_read_bool(np, "mediatek,ufs-boost-crypt"))
 		ufs_mtk_init_boost_crypt(hba);
 
-	if (of_property_read_bool(np, "mediatek,ufs-support-va09"))
-		ufs_mtk_init_va09_pwr_ctrl(hba);
+	ret = ufs_mtk_init_va09_pwr_ctrl(hba);
+	if (ret)
+		return ret;
 
 	if (of_property_read_bool(np, "mediatek,ufs-disable-ah8"))
 		host->caps |= UFS_MTK_CAP_DISABLE_AH8;
@@ -663,6 +674,7 @@ static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
 		host->caps |= UFS_MTK_CAP_RTFF_MTCMOS;
 
 	dev_info(hba->dev, "caps: 0x%x", host->caps);
+	return 0;
 }
 
 static void ufs_mtk_scale_perf(struct ufs_hba *hba, bool scale_up)
@@ -985,7 +997,9 @@ static int ufs_mtk_init(struct ufs_hba *hba)
 	}
 
 	/* Initialize host capability */
-	ufs_mtk_init_host_caps(hba);
+	err = ufs_mtk_init_host_caps(hba);
+	if (err)
+		goto out;
 
 	ufs_mtk_init_mcq_irq(hba);
 
-- 
2.44.0