linux-kernel - [PATCH v1] PCI: dw-rockchip: Simplify regulator setup with devm_regulator_get_enable

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Message-ID: <20250905112736.6401-1-linux.amoon@gmail.com>
Date: Fri,  5 Sep 2025 16:57:25 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Niklas Cassel <cassel@...nel.org>,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Hans Zhang <18255117159@....com>,
	Wilfred Mallawa <wilfred.mallawa@....com>,
	linux-pci@...r.kernel.org (open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Rockchip SoC support),
	linux-rockchip@...ts.infradead.org (open list:ARM/Rockchip SoC support),
	linux-kernel@...r.kernel.org (open list)
Cc: Anand Moon <linux.amoon@...il.com>
Subject: [PATCH v1] PCI: dw-rockchip: Simplify regulator setup with devm_regulator_get_enable_optional()

Replace manual get/enable logic with devm_regulator_get_enable_optional()
to reduce boilerplate and improve error handling. This devm helper ensures
the regulator is enabled during probe and automatically disabled on driver
removal. Dropping the vpcie3v3 struct member eliminates redundant state
tracking, resulting in cleaner and more maintainable code.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
 drivers/pci/controller/dwc/pcie-dw-rockchip.c | 23 +++++--------------
 1 file changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index b5f5eee5a50e..56baca52c3e9 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -76,7 +76,6 @@ struct rockchip_pcie {
 	unsigned int clk_cnt;
 	struct reset_control *rst;
 	struct gpio_desc *rst_gpio;
-	struct regulator *vpcie3v3;
 	struct irq_domain *irq_domain;
 	const struct rockchip_pcie_of_data *data;
 };
@@ -644,22 +643,15 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 		return ret;
 
 	/* DON'T MOVE ME: must be enable before PHY init */
-	rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
-	if (IS_ERR(rockchip->vpcie3v3)) {
-		if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
-			return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
-					"failed to get vpcie3v3 regulator\n");
-		rockchip->vpcie3v3 = NULL;
-	} else {
-		ret = regulator_enable(rockchip->vpcie3v3);
-		if (ret)
-			return dev_err_probe(dev, ret,
-					     "failed to enable vpcie3v3 regulator\n");
-	}
+	ret = devm_regulator_get_enable_optional(dev, "vpcie3v3");
+	if (ret < 0 && ret != -ENODEV)
+		return dev_err_probe(dev, ret,
+				     "failed to enable vpcie3v3 regulator\n");
 
 	ret = rockchip_pcie_phy_init(rockchip);
 	if (ret)
-		goto disable_regulator;
+		return dev_err_probe(dev, ret,
+				     "failed to initialize the phy\n");
 
 	ret = reset_control_deassert(rockchip->rst);
 	if (ret)
@@ -692,9 +684,6 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 	clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
 deinit_phy:
 	rockchip_pcie_phy_deinit(rockchip);
-disable_regulator:
-	if (rockchip->vpcie3v3)
-		regulator_disable(rockchip->vpcie3v3);
 
 	return ret;
 }

base-commit: d69eb204c255c35abd9e8cb621484e8074c75eaa
-- 
2.50.1