[PATCH v1 6/9] pcie: starfive: Add a optional power gpio support

[Hal Feng <hal.feng@starfivetech.com>]

Get and enable a optional power gpio. This feature is ported
from the jh7110 pcie driver in Linux. VisionFive 2 Lite needs
this gpio to enable the PCI bus device (M.2 M-Key) power.

Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
---
 drivers/pci/pcie_starfive_jh7110.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/pcie_starfive_jh7110.c b/drivers/pci/pcie_starfive_jh7110.c
index 0908ae16b67..04088b48ddc 100644
--- a/drivers/pci/pcie_starfive_jh7110.c
+++ b/drivers/pci/pcie_starfive_jh7110.c
@@ -45,6 +45,7 @@ struct starfive_pcie {
 	struct pcie_plda plda;
 	struct clk_bulk	clks;
 	struct reset_ctl_bulk	rsts;
+	struct gpio_desc	power_gpio;
 	struct gpio_desc	reset_gpio;
 	struct regmap *regmap;
 	unsigned int stg_pcie_base;
@@ -184,6 +185,10 @@ static int starfive_pcie_parse_dt(struct udevice *dev)
 		dev_err(dev, "reset-gpio is not valid\n");
 		return -EINVAL;
 	}
+
+	gpio_request_by_name(dev, "enable-gpios", 0, &priv->power_gpio,
+			     GPIOD_IS_OUT);
+
 	return 0;
 }
 
@@ -205,6 +210,9 @@ static int starfive_pcie_init_port(struct udevice *dev)
 		goto err_deassert_clk;
 	}
 
+	if (dm_gpio_is_valid(&priv->power_gpio))
+		dm_gpio_set_value(&priv->power_gpio, 1);
+
 	dm_gpio_set_value(&priv->reset_gpio, 1);
 	/* Disable physical functions except #0 */
 	for (i = 1; i < PLDA_FUNC_NUM; i++) {
-- 
2.43.2