linux-kernel - [PATCH 13/15] phy: qcom-qmp-pcie: add support for pipediv2 clock

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Date:   Mon, 17 Oct 2022 16:53:26 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 13/15] phy: qcom-qmp-pcie: add support for pipediv2 clock

Some QMP PHYs have a second fixed-divider pipe clock that needs to be
enabled along with the pipe clock.

Add support for an optional "pipediv2" clock.

Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 42 ++++++++++++++++++++----
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 9c8e009033f1..c1d74c06fad1 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -1379,7 +1379,9 @@ struct qmp_pcie {
 	void __iomem *rx2;
 
 	struct clk *pipe_clk;
+	struct clk *pipediv2_clk;
 	struct clk_bulk_data *clks;
+
 	struct reset_control_bulk_data *resets;
 	struct regulator_bulk_data *vregs;
 
@@ -1902,6 +1904,36 @@ static int qmp_pcie_exit(struct phy *phy)
 	return 0;
 }
 
+static int pipe_clk_enable(struct qmp_pcie *qmp)
+{
+	int ret;
+
+	ret = clk_prepare_enable(qmp->pipe_clk);
+	if (ret) {
+		dev_err(qmp->dev, "failed to enable pipe clock: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(qmp->pipediv2_clk);
+	if (ret) {
+		dev_err(qmp->dev, "failed to enable pipediv2 clock: %d\n", ret);
+		goto err_disable_pipe_clk;
+	}
+
+	return 0;
+
+err_disable_pipe_clk:
+	clk_disable_unprepare(qmp->pipe_clk);
+
+	return ret;
+}
+
+static void pipe_clk_disable(struct qmp_pcie *qmp)
+{
+	clk_disable_unprepare(qmp->pipediv2_clk);
+	clk_disable_unprepare(qmp->pipe_clk);
+}
+
 static int qmp_pcie_power_on(struct phy *phy)
 {
 	struct qmp_pcie *qmp = phy_get_drvdata(phy);
@@ -1923,11 +1955,9 @@ static int qmp_pcie_power_on(struct phy *phy)
 	qmp_pcie_init_registers(qmp, &cfg->tables);
 	qmp_pcie_init_registers(qmp, mode_tables);
 
-	ret = clk_prepare_enable(qmp->pipe_clk);
-	if (ret) {
-		dev_err(qmp->dev, "pipe_clk enable failed err=%d\n", ret);
+	ret = pipe_clk_enable(qmp);
+	if (ret)
 		return ret;
-	}
 
 	/* Pull PHY out of reset state */
 	qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
@@ -1950,7 +1980,7 @@ static int qmp_pcie_power_on(struct phy *phy)
 	return 0;
 
 err_disable_pipe_clk:
-	clk_disable_unprepare(qmp->pipe_clk);
+	pipe_clk_disable(qmp);
 
 	return ret;
 }
@@ -1960,7 +1990,7 @@ static int qmp_pcie_power_off(struct phy *phy)
 	struct qmp_pcie *qmp = phy_get_drvdata(phy);
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
 
-	clk_disable_unprepare(qmp->pipe_clk);
+	pipe_clk_disable(qmp);
 
 	/* PHY reset */
 	qphy_setbits(qmp->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
-- 
2.37.3