linux-kernel - [PATCH] arm64: dts: rockchip: fix nEXTRST on SOQuartz

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Message-Id: <20230419171731.28641-1-frattaroli.nicolas@gmail.com>
Date:   Wed, 19 Apr 2023 19:17:31 +0200
From:   Nicolas Frattaroli <frattaroli.nicolas@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Peter Geis <pgwipeout@...il.com>
Cc:     Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: fix nEXTRST on SOQuartz

In pre-production prototypes (of which I only know one person
having one, Peter Geis), GPIO0 pin A5 was tied to the SDMMC
power enable pin on the CM4 connector. On all production models,
this is not the case; instead, this pin is used for the nEXTRST
signal, and the SDMMC power enable pin is always pulled high.

Since everyone currently using the SOQuartz device trees will
want this change, it is made to the tree without splitting the
trees into two separate ones of which users will then inevitably
choose the wrong one.

This fixes USB and PCIe on a wide variety of CM4IO-compatible
boards which either rely on the 3.3V being there or use the
nEXTRST signal.

Fixes: 5859b5a9c3ac ("arm64: dts: rockchip: add SoQuartz CM4IO dts")
Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@...il.com>
---
 .../boot/dts/rockchip/rk3566-soquartz-cm4.dts | 18 +++++++------
 .../boot/dts/rockchip/rk3566-soquartz.dtsi    | 25 ++++++++++---------
 2 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts b/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts
index 263ce40770dd..cddf6cd2fecb 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts
@@ -28,6 +28,16 @@ vcc_5v: vcc-5v-regulator {
 		regulator-max-microvolt = <5000000>;
 		vin-supply = <&vcc12v_dcin>;
 	};
+
+	vcc_sd_pwr: vcc-sd-pwr-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_sd_pwr";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc3v3_sys>;
+	};
 };
 
 /* phy for pcie */
@@ -130,13 +140,7 @@ &saradc {
 };
 
 &sdmmc0 {
-	vmmc-supply = <&sdmmc_pwr>;
-	status = "okay";
-};
-
-&sdmmc_pwr {
-	regulator-min-microvolt = <3300000>;
-	regulator-max-microvolt = <3300000>;
+	vmmc-supply = <&vcc_sd_pwr>;
 	status = "okay";
 };
 
diff --git a/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi b/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi
index ce7165d7f1a1..f589a4fdaccb 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi
@@ -65,6 +65,17 @@ led_work: led-work {
 		};
 	};
 
+	nextrst_pin: nextrst-pin-regulator {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio0 RK_PA5 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&nextrst_h>;
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-name = "nextrst";
+	};
+
 	sdio_pwrseq: sdio-pwrseq {
 		status = "okay";
 		compatible = "mmc-pwrseq-simple";
@@ -104,16 +115,6 @@ vcc3v3_sys: vcc3v3-sys-regulator {
 		regulator-max-microvolt = <3300000>;
 		vin-supply = <&vcc5v0_sys>;
 	};
-
-	sdmmc_pwr: sdmmc-pwr-regulator {
-		compatible = "regulator-fixed";
-		enable-active-high;
-		gpio = <&gpio0 RK_PA5 GPIO_ACTIVE_HIGH>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&sdmmc_pwr_h>;
-		regulator-name = "sdmmc_pwr";
-		status = "disabled";
-	};
 };
 
 &cpu0 {
@@ -539,8 +540,8 @@ wifi_enable_h: wifi-enable-h {
 		};
 	};
 
-	sdmmc-pwr {
-		sdmmc_pwr_h: sdmmc-pwr-h {
+	nextrst {
+		nextrst_h: nextrst-h {
 			rockchip,pins = <0 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 	};
-- 
2.40.0