linux-kernel - [PATCH v4 3/7] phy: qcom-qmp: Fix phy pipe clock name

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Message-Id: <1500636977-11934-4-git-send-email-varada@codeaurora.org>
Date:   Fri, 21 Jul 2017 17:06:13 +0530
From:   Varadarajan Narayanan <varada@...eaurora.org>
To:     bhelgaas@...gle.com, robh+dt@...nel.org, mark.rutland@....com,
        svarbanov@...sol.com, kishon@...com, sboyd@...eaurora.org,
        vivek.gautam@...eaurora.org, fengguang.wu@...el.com,
        weiyongjun1@...wei.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Varadarajan Narayanan <varada@...eaurora.org>
Subject: [PATCH v4 3/7] phy: qcom-qmp: Fix phy pipe clock name

Presently, the phy pipe clock's name is assumed to be either
usb3_phy_pipe_clk_src or pcie_XX_pipe_clk_src (where XX is the
phy lane's number). However, this will not work if an SoC has
more than one instance of the phy. Hence, instead of assuming
the name of the clock, fetch it from the DT.

Signed-off-by: Varadarajan Narayanan <varada@...eaurora.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 45 +++++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 78ca628..b046866 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -925,20 +925,13 @@ static int qcom_qmp_phy_clk_init(struct device *dev)
  *    clk  |   +-------+   |                   +-----+
  *         +---------------+
  */
-static int phy_pipe_clk_register(struct qcom_qmp *qmp, int id)
+static int phy_pipe_clk_register(struct qcom_qmp *qmp, const char *clk_name)
 {
-	char name[24];
 	struct clk_fixed_rate *fixed;
 	struct clk_init_data init = { };
 
-	switch (qmp->cfg->type) {
-	case PHY_TYPE_USB3:
-		snprintf(name, sizeof(name), "usb3_phy_pipe_clk_src");
-		break;
-	case PHY_TYPE_PCIE:
-		snprintf(name, sizeof(name), "pcie_%d_pipe_clk_src", id);
-		break;
-	default:
+	if ((qmp->cfg->type != PHY_TYPE_USB3) &&
+	    (qmp->cfg->type != PHY_TYPE_PCIE)) {
 		/* not all phys register pipe clocks, so return success */
 		return 0;
 	}
@@ -947,7 +940,7 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, int id)
 	if (!fixed)
 		return -ENOMEM;
 
-	init.name = name;
+	init.name = clk_name;
 	init.ops = &clk_fixed_rate_ops;
 
 	/* controllers using QMP phys use 125MHz pipe clock interface */
@@ -1110,6 +1103,8 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 
 	id = 0;
 	for_each_available_child_of_node(dev->of_node, child) {
+		const char *clk_name;
+
 		/* Create per-lane phy */
 		ret = qcom_qmp_phy_create(dev, child, id);
 		if (ret) {
@@ -1119,15 +1114,31 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 		}
 
 		/*
-		 * Register the pipe clock provided by phy.
-		 * See function description to see details of this pipe clock.
+		 * This property is mandatory only for PCIe/USB phys.
+		 * For other phy types don't return failure.
 		 */
-		ret = phy_pipe_clk_register(qmp, id);
-		if (ret) {
-			dev_err(qmp->dev,
-				"failed to register pipe clock source\n");
+		ret = of_property_read_string(child, "clock-output-names",
+							&clk_name);
+		if (ret && (qmp->cfg->type == PHY_TYPE_PCIE ||
+			    qmp->cfg->type == PHY_TYPE_USB3)) {
+			dev_err(dev,
+				"failed to get clock-output-names for lane%d phy, %d\n",
+				id, ret);
 			return ret;
 		}
+
+		if (!ret) {
+			/*
+			 * Register the pipe clock provided by phy. See function
+			 * description to see details of this pipe clock.
+			 */
+			ret = phy_pipe_clk_register(qmp, clk_name);
+			if (ret) {
+				dev_err(qmp->dev,
+					"failed to register pipe clock source\n");
+				return ret;
+			}
+		}
 		id++;
 	}
 
-- 
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