linux-kernel - [PATCH] phy: qualcomm: m31-eusb2: Add runtime pm ops

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Message-Id: <20251027062458.1411096-1-prashanth.k@oss.qualcomm.com>
Date: Mon, 27 Oct 2025 11:54:58 +0530
From: Prashanth K <prashanth.k@....qualcomm.com>
To: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Prashanth K <prashanth.k@....qualcomm.com>
Subject: [PATCH] phy: qualcomm: m31-eusb2: Add runtime pm ops

Add runtime power management operation callbacks for M31 EUSB2 PHY.
Enable/disable the clocks based on the runtime suspend/resume calls.

Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
---
 drivers/phy/qualcomm/phy-qcom-m31-eusb2.c | 40 +++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
index 0a0d2d9fc846..1aeb5e3de07c 100644
--- a/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
+++ b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
@@ -240,6 +240,34 @@ static const struct phy_ops m31eusb2_phy_gen_ops = {
 	.owner		= THIS_MODULE,
 };
 
+static int m31eusb2_phy_runtime_suspend(struct device *dev)
+{
+	struct m31eusb2_phy *phy = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "Suspending M31 eUSB2 Phy\n");
+	clk_disable_unprepare(phy->clk);
+
+	return 0;
+}
+
+static int m31eusb2_phy_runtime_resume(struct device *dev)
+{
+	struct m31eusb2_phy *phy = dev_get_drvdata(dev);
+	int ret = 0;
+
+	dev_dbg(dev, "Resuming M31 eUSB2 Phy\n");
+	ret = clk_prepare_enable(phy->clk);
+	if (ret)
+		dev_err(dev, "failed to enable ref clock, %d\n", ret);
+
+	return ret;
+}
+
+static const struct dev_pm_ops m31eusb2_phy_pm_ops = {
+	SET_RUNTIME_PM_OPS(m31eusb2_phy_runtime_suspend,
+			   m31eusb2_phy_runtime_resume, NULL)
+};
+
 static int m31eusb2_phy_probe(struct platform_device *pdev)
 {
 	struct phy_provider *phy_provider;
@@ -270,6 +298,17 @@ static int m31eusb2_phy_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(phy->clk),
 				     "failed to get clk\n");
 
+	dev_set_drvdata(dev, phy);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	/*
+	 * Prevent runtime pm from being ON by default. Users can enable
+	 * it using power/control in sysfs.
+	 */
+	pm_runtime_forbid(dev);
+
+
 	phy->phy = devm_phy_create(dev, NULL, &m31eusb2_phy_gen_ops);
 	if (IS_ERR(phy->phy))
 		return dev_err_probe(dev, PTR_ERR(phy->phy),
@@ -313,6 +352,7 @@ static struct platform_driver m31eusb2_phy_driver = {
 	.probe = m31eusb2_phy_probe,
 	.driver = {
 		.name = "qcom-m31eusb2-phy",
+		.pm = &m31eusb2_phy_pm_ops,
 		.of_match_table = m31eusb2_phy_id_table,
 	},
 };
-- 
2.34.1