[PATCH v4 5/7] phy: rockchip-samsung-dcphy: Factor the transmitter teardown into a helper

The transmitter's power-on path is in samsung_mipi_dphy_tx_power_on(),
but the power_off callback still does the teardown itself.

Move the teardown into samsung_mipi_dphy_tx_power_off(), so that
power-on and power-off are a matching pair. Both callbacks then have a
type switch whose arms are plain returns. Turn each into an early guard
for the not yet supported C-PHY and drop the unreachable trailing
return.

No functional change intended.

Signed-off-by: Jason Yang <[email protected]>
---
 drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c | 31 ++++++++++-------------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c b/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c
index f58907dec733..5d9d44a1d6a2 100644
--- a/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c
+++ b/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c
@@ -1361,37 +1361,34 @@ static int samsung_mipi_dphy_tx_power_on(struct samsung_mipi_dcphy *samsung)
 	return 0;
 }
 
+static int samsung_mipi_dphy_tx_power_off(struct samsung_mipi_dcphy *samsung)
+{
+	samsung_mipi_dphy_tx_lane_disable(samsung);
+	samsung_mipi_dcphy_pll_disable(samsung);
+
+	return 0;
+}
+
 static int samsung_mipi_dcphy_tx_power_on(struct phy *phy)
 {
 	struct samsung_mipi_dcphy *samsung = phy_get_drvdata(phy);
 
-	switch (samsung->type) {
-	case PHY_TYPE_DPHY:
-		return samsung_mipi_dphy_tx_power_on(samsung);
-	default:
-		/* CPHY part to be implemented later */
+	/* CPHY part to be implemented later */
+	if (samsung->type != PHY_TYPE_DPHY)
 		return -EOPNOTSUPP;
-	}
 
-	return 0;
+	return samsung_mipi_dphy_tx_power_on(samsung);
 }
 
 static int samsung_mipi_dcphy_tx_power_off(struct phy *phy)
 {
 	struct samsung_mipi_dcphy *samsung = phy_get_drvdata(phy);
 
-	switch (samsung->type) {
-	case PHY_TYPE_DPHY:
-		samsung_mipi_dphy_tx_lane_disable(samsung);
-		break;
-	default:
-		/* CPHY part to be implemented later */
+	/* CPHY part to be implemented later */
+	if (samsung->type != PHY_TYPE_DPHY)
 		return -EOPNOTSUPP;
-	}
 
-	samsung_mipi_dcphy_pll_disable(samsung);
-
-	return 0;
+	return samsung_mipi_dphy_tx_power_off(samsung);
 }
 
 static int

-- 
2.43.0