[PATCH v3 3/9] pci: pcie_dw_rockchip: Use regulator_set_enable_if_allowed

[Jonas Karlman]

The vpcie3v3 regulator is typically a fixed regulator controlled using
gpio. Change to use enable and disable calls on the regulator instead
of trying to set a voltage value.

Also remove the delay to match linux driver, for a fixed regulator the
startup-delay-us prop can be used in case a startup delay is needed.
Limited testing on ROCK 3A, ROCK 5B, Quartz64, Odroid-M1 has shown that
this delay was not needed.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>
---
v3:
- Collect r-b tag

v2:
- Update commit message

 drivers/pci/pcie_dw_rockchip.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/pcie_dw_rockchip.c b/drivers/pci/pcie_dw_rockchip.c
index 83737e62bc6a..1b8a1409f6df 100644
--- a/drivers/pci/pcie_dw_rockchip.c
+++ b/drivers/pci/pcie_dw_rockchip.c
@@ -288,21 +288,16 @@ static int rockchip_pcie_init_port(struct udevice *dev)
 	struct rk_pcie *priv = dev_get_priv(dev);
 
 	/* Set power and maybe external ref clk input */
-	if (priv->vpcie3v3) {
-		ret = regulator_set_value(priv->vpcie3v3, 3300000);
-		if (ret) {
-			dev_err(priv->dw.dev, "failed to enable vpcie3v3 (ret=%d)\n",
-				ret);
-			return ret;
-		}
+	ret = regulator_set_enable_if_allowed(priv->vpcie3v3, true);
+	if (ret && ret != -ENOSYS) {
+		dev_err(dev, "failed to enable vpcie3v3 (ret=%d)\n", ret);
+		return ret;
 	}
 
-	udelay(MACRO_US * 1000);
-
 	ret = generic_phy_init(&priv->phy);
 	if (ret) {
 		dev_err(dev, "failed to init phy (ret=%d)\n", ret);
-		return ret;
+		goto err_disable_regulator;
 	}
 
 	ret = generic_phy_power_on(&priv->phy);
@@ -345,6 +340,8 @@ err_power_off_phy:
 	generic_phy_power_off(&priv->phy);
 err_exit_phy:
 	generic_phy_exit(&priv->phy);
+err_disable_regulator:
+	regulator_set_enable_if_allowed(priv->vpcie3v3, false);
 
 	return ret;
 }
-- 
2.41.0