linux-kernel - [PATCH 1/2] phy: qcom: qmp-pcie: restore compatibility with existing DTs

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Message-Id: <20240521-fix-pcie-phy-compat-v1-1-8aa415b92308@linaro.org>
Date: Tue, 21 May 2024 23:30:45 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 devicetree@...r.kernel.org
Subject: [PATCH 1/2] phy: qcom: qmp-pcie: restore compatibility with
 existing DTs

Existing device trees specify only a single clock-output-name for the
PCIe PHYs. The function phy_aux_clk_register() expects a second entry in
that property. When it doesn't find it, it returns an error, thus
failing the probe of the PHY and thus breaking support for the
corresponding PCIe host.

Follow the approach of the combo USB+DT PHY and generate the name for
the AUX clocks instead of requiring it in DT.

Fixes: 583ca9ccfa80 ("phy: qcom: qmp-pcie: register second optional PHY AUX clock")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 6c796723c8f5..b4767b8cc014 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -3730,14 +3730,11 @@ static int phy_aux_clk_register(struct qmp_pcie *qmp, struct device_node *np)
 {
 	struct clk_fixed_rate *fixed = &qmp->aux_clk_fixed;
 	struct clk_init_data init = { };
-	int ret;
+	char name[64];
 
-	ret = of_property_read_string_index(np, "clock-output-names", 1, &init.name);
-	if (ret) {
-		dev_err(qmp->dev, "%pOFn: No clock-output-names index 1\n", np);
-		return ret;
-	}
+	snprintf(name, sizeof(name), "%s::pipe_aux_clk", dev_name(qmp->dev));
 
+	init.name = name;
 	init.ops = &clk_fixed_rate_ops;
 
 	fixed->fixed_rate = qmp->cfg->aux_clock_rate;

-- 
2.39.2