linux-kernel - [PATCH v2] arm64: dts: qcom: sa8155p-adp: fix SDHC2 configuration

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Date: Thu, 11 Apr 2024 11:55:55 +0000
From: Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>
CC: Stephan Gerhold <stephan@...hold.net>,
        Volodymyr Babchuk
	<Volodymyr_Babchuk@...m.com>,
        "stable@...r.kernel.org"
	<stable@...r.kernel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad
 Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] arm64: dts: qcom: sa8155p-adp: fix SDHC2 configuration

There are multiple issues with SDHC2 configuration for SA8155P-ADP,
which prevent use of SDHC2 and causes issues with ethernet:

- Card Detect pin for SHDC2 on SA8155P-ADP is connected to gpio4 of
  PMM8155AU_1, not to SoC itself. SoC's gpio4 is used for DWMAC
  TX. If sdhc driver probes after dwmac driver, it reconfigures
  gpio4 and this breaks Ethernet MAC.

- pinctrl configuration mentions gpio96 as CD pin. It seems it was
  copied from some SM8150 example, because as mentioned above,
  correct CD pin is gpio4 on PMM8155AU_1.

- L13C voltage regulator limits minimal voltage to 2.504V, which
  prevents use 1.8V to power SD card, which in turns does not allow
  card to work in UHS mode.

This patch fixes all the mentioned issues.

Fixes: 0deb2624e2d0 ("arm64: dts: qcom: sa8155p-adp: Add support for uSD card")
Cc: stable@...r.kernel.org
Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@...m.com>

---

In v2:
 - Added "Fixes:" tag
 - CCed stable ML
 - Fixed pinctrl configuration
 - Extended voltage range for L13C voltage regulator
---
 arch/arm64/boot/dts/qcom/sa8155p-adp.dts | 32 +++++++++++-------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sa8155p-adp.dts b/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
index 5e4287f8c8cd1..b9d56bda96759 100644
--- a/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
+++ b/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
@@ -283,7 +283,7 @@ vreg_l12c_1p808: ldo12 {
 
 		vreg_l13c_2p96: ldo13 {
 			regulator-name = "vreg_l13c_2p96";
-			regulator-min-microvolt = <2504000>;
+			regulator-min-microvolt = <1800000>;
 			regulator-max-microvolt = <2960000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
@@ -384,10 +384,10 @@ &remoteproc_cdsp {
 &sdhc_2 {
 	status = "okay";
 
-	cd-gpios = <&tlmm 4 GPIO_ACTIVE_LOW>;
+	cd-gpios = <&pmm8155au_1_gpios 4 GPIO_ACTIVE_LOW>;
 	pinctrl-names = "default", "sleep";
-	pinctrl-0 = <&sdc2_on>;
-	pinctrl-1 = <&sdc2_off>;
+	pinctrl-0 = <&sdc2_on &pmm8155au_1_sdc2_cd>;
+	pinctrl-1 = <&sdc2_off &pmm8155au_1_sdc2_cd>;
 	vqmmc-supply = <&vreg_l13c_2p96>; /* IO line power */
 	vmmc-supply = <&vreg_l17a_2p96>;  /* Card power line */
 	bus-width = <4>;
@@ -505,13 +505,6 @@ data-pins {
 			bias-pull-up;		/* pull up */
 			drive-strength = <16>;	/* 16 MA */
 		};
-
-		sd-cd-pins {
-			pins = "gpio96";
-			function = "gpio";
-			bias-pull-up;		/* pull up */
-			drive-strength = <2>;	/* 2 MA */
-		};
 	};
 
 	sdc2_off: sdc2-off-state {
@@ -532,13 +525,6 @@ data-pins {
 			bias-pull-up;		/* pull up */
 			drive-strength = <2>;	/* 2 MA */
 		};
-
-		sd-cd-pins {
-			pins = "gpio96";
-			function = "gpio";
-			bias-pull-up;		/* pull up */
-			drive-strength = <2>;	/* 2 MA */
-		};
 	};
 
 	usb2phy_ac_en1_default: usb2phy-ac-en1-default-state {
@@ -604,3 +590,13 @@ phy-reset-pins {
 		};
 	};
 };
+
+&pmm8155au_1_gpios {
+	pmm8155au_1_sdc2_cd: pmm8155au_1-sdc2-cd {
+			pins = "gpio4";
+			function = "normal";
+			input-enable;
+			bias-pull-up;
+			power-source = <0>;
+	};
+};
-- 
2.44.0