linux-kernel - [PATCH 1/2] arm64: dts: ti: k3-am62a: Enable UHS mode support for SD cards

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Date:   Thu, 26 Oct 2023 12:31:54 +0530
From:   Nitin Yadav <n-yadav@...com>
To:     <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] arm64: dts: ti: k3-am62a: Enable UHS mode support for SD cards

Hook up required IO voltage regulators to support UHS modes on
SD cards.

Signed-off-by: Nitin Yadav <n-yadav@...com>
---
 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
index 9f3dfbfbf369..3ae1ea1997a4 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
@@ -102,6 +102,19 @@ vdd_mmc1: regulator-3 {
 		gpio = <&exp1 3 GPIO_ACTIVE_HIGH>;
 	};
 
+	vddshv_sdio: regulator-4 {
+		compatible = "regulator-gpio";
+		regulator-name = "vddshv_sdio";
+		pinctrl-names = "default";
+		pinctrl-0 = <&vddshv_sdio_default_pins>;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		gpios = <&main_gpio0 31 GPIO_ACTIVE_HIGH>;
+		states = <1800000 0x0>,
+			 <3300000 0x1>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 		pinctrl-names = "default";
@@ -189,6 +202,12 @@ AM62AX_IOPAD(0x1f8, PIN_INPUT_PULLUP, 0) /* (AC2) MMC0_DAT7 */
 		>;
 	};
 
+	vddshv_sdio_default_pins: vddshv-sdio-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_IOPAD(0x07c, PIN_OUTPUT, 7) /* (M19) GPMC0_CLK.GPIO0_31 */
+		>;
+	};
+
 	main_mmc1_pins_default: main-mmc1-default-pins {
 		pinctrl-single,pins = <
 			AM62AX_IOPAD(0x23c, PIN_INPUT, 0) /* (A21) MMC1_CMD */
@@ -294,6 +313,7 @@ &sdhci1 {
 	/* SD/MMC */
 	status = "okay";
 	vmmc-supply = <&vdd_mmc1>;
+	vqmmc-supply = <&vddshv_sdio>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_mmc1_pins_default>;
 	ti,driver-strength-ohm = <50>;
-- 
2.25.1