linux-kernel - [PATCH v4 1/3] phy: qcom-qmp-pcie: make pipe clock rate configurable

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Date:   Tue, 21 Jun 2022 21:55:10 +0200
From:   Robert Marko <robimarko@...il.com>
To:     agross@...nel.org, bjorn.andersson@...aro.org, kishon@...com,
        vkoul@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dmitry.baryshkov@...aro.org
Cc:     Robert Marko <robimarko@...il.com>
Subject: [PATCH v4 1/3] phy: qcom-qmp-pcie: make pipe clock rate configurable

IPQ8074 Gen3 PCIe PHY uses 250MHz as the pipe clock rate instead of 125MHz
like every other PCIe QMP PHY does, so make it configurable as part of the
qmp_phy_cfg.

Signed-off-by: Robert Marko <robimarko@...il.com>
---
Changes in v4:
* Set 125MHz as the default if not set in qmp_phy_cfg
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index b2cd0cf965d8..66be854fe7f3 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -1284,6 +1284,9 @@ struct qmp_phy_cfg {
 
 	/* true, if PHY has secondary tx/rx lanes to be configured */
 	bool is_dual_lane_phy;
+
+	/* QMP PHY pipe clock interface rate */
+	unsigned long pipe_clock_rate;
 };
 
 /**
@@ -2121,8 +2124,15 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, struct device_node *np)
 
 	init.ops = &clk_fixed_rate_ops;
 
-	/* controllers using QMP phys use 125MHz pipe clock interface */
-	fixed->fixed_rate = 125000000;
+	/*
+	 * Controllers using QMP PHY-s use 125MHz pipe clock interface
+	 * unless other frequency is specified in the PHY config.
+	 */
+	if (qmp->phys[0]->cfg->pipe_clock_rate)
+		fixed->fixed_rate = qmp->phys[0]->cfg->pipe_clock_rate;
+	else
+		fixed->fixed_rate = 125000000;
+
 	fixed->hw.init = &init;
 
 	ret = devm_clk_hw_register(qmp->dev, &fixed->hw);
-- 
2.36.1