linux-kernel - [PATCH v4 1/6] PCI: starfive: Use regulator APIs instead of GPIO APIs to enable the 3V3 power supply of PCIe slots

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Message-ID: <20251125075604.69370-2-hal.feng@starfivetech.com>
Date: Tue, 25 Nov 2025 15:55:59 +0800
From: Hal Feng <hal.feng@...rfivetech.com>
To: Conor Dooley <conor+dt@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <pjw@...nel.org>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Emil Renner Berthing <emil.renner.berthing@...onical.com>,
	Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
	E Shattow <e@...eshell.de>
Cc: Hal Feng <hal.feng@...rfivetech.com>,
	devicetree@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/6] PCI: starfive: Use regulator APIs instead of GPIO APIs to enable the 3V3 power supply of PCIe slots

The "enable-gpio" property is not documented in the dt-bindings and
using GPIO APIs is not a standard method to enable or disable PCIe
slot power, so use regulator APIs to replace them.

Tested-by: Matthias Brugger <mbrugger@...e.com>
Fixes: 39b91eb40c6a ("PCI: starfive: Add JH7110 PCIe controller")
Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
---
 drivers/pci/controller/plda/pcie-starfive.c | 25 ++++++++++++---------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-starfive.c b/drivers/pci/controller/plda/pcie-starfive.c
index 3caf53c6c082..298036c3e7f9 100644
--- a/drivers/pci/controller/plda/pcie-starfive.c
+++ b/drivers/pci/controller/plda/pcie-starfive.c
@@ -55,7 +55,7 @@ struct starfive_jh7110_pcie {
 	struct reset_control *resets;
 	struct clk_bulk_data *clks;
 	struct regmap *reg_syscon;
-	struct gpio_desc *power_gpio;
+	struct regulator *vpcie3v3;
 	struct gpio_desc *reset_gpio;
 	struct phy *phy;
 
@@ -153,11 +153,13 @@ static int starfive_pcie_parse_dt(struct starfive_jh7110_pcie *pcie,
 		return dev_err_probe(dev, PTR_ERR(pcie->reset_gpio),
 				     "failed to get perst-gpio\n");
 
-	pcie->power_gpio = devm_gpiod_get_optional(dev, "enable",
-						   GPIOD_OUT_LOW);
-	if (IS_ERR(pcie->power_gpio))
-		return dev_err_probe(dev, PTR_ERR(pcie->power_gpio),
-				     "failed to get power-gpio\n");
+	pcie->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
+	if (IS_ERR(pcie->vpcie3v3)) {
+		if (PTR_ERR(pcie->vpcie3v3) != -ENODEV)
+			return dev_err_probe(dev, PTR_ERR(pcie->vpcie3v3),
+					     "failed to get vpcie3v3 regulator\n");
+		pcie->vpcie3v3 = NULL;
+	}
 
 	return 0;
 }
@@ -270,8 +272,8 @@ static void starfive_pcie_host_deinit(struct plda_pcie_rp *plda)
 		container_of(plda, struct starfive_jh7110_pcie, plda);
 
 	starfive_pcie_clk_rst_deinit(pcie);
-	if (pcie->power_gpio)
-		gpiod_set_value_cansleep(pcie->power_gpio, 0);
+	if (pcie->vpcie3v3)
+		regulator_disable(pcie->vpcie3v3);
 	starfive_pcie_disable_phy(pcie);
 }
 
@@ -304,8 +306,11 @@ static int starfive_pcie_host_init(struct plda_pcie_rp *plda)
 	if (ret)
 		return ret;
 
-	if (pcie->power_gpio)
-		gpiod_set_value_cansleep(pcie->power_gpio, 1);
+	if (pcie->vpcie3v3) {
+		ret = regulator_enable(pcie->vpcie3v3);
+		if (ret)
+			dev_err_probe(dev, ret, "failed to enable vpcie3v3 regulator\n");
+	}
 
 	if (pcie->reset_gpio)
 		gpiod_set_value_cansleep(pcie->reset_gpio, 1);
-- 
2.43.2