linux-kernel - [PATCH 3/7] arm64: dts: ti: k3-am654-base-board: Add VTT GPIO regulator for DDR

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Date:   Wed, 19 Apr 2023 17:59:09 -0500
From:   Nishanth Menon <nm@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Tero Kristo <kristo@...nel.org>, Nishanth Menon <nm@...com>,
        Jan Kiszka <jan.kiszka@...mens.com>
Subject: [PATCH 3/7] arm64: dts: ti: k3-am654-base-board: Add VTT GPIO regulator for DDR

Hold the DDR vtt regulator active for functionality.

Signed-off-by: Nishanth Menon <nm@...com>
---
 .../arm64/boot/dts/ti/k3-am654-base-board.dts | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
index d3dd6899ef03..83467adc017d 100644
--- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
@@ -117,6 +117,20 @@ vdd_mmc1_sd: regulator-2 {
 		vin-supply = <&vcc3v3_io>;
 		gpio = <&pca9554 4 GPIO_ACTIVE_HIGH>;
 	};
+
+	vtt_supply: regulator-3 {
+		compatible = "regulator-fixed";
+		regulator-name = "vtt";
+		pinctrl-names = "default";
+		pinctrl-0 = <&ddr_vtt_pins_default>;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		enable-active-high;
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&vcc3v3_io>;
+		gpio = <&wkup_gpio0 28 GPIO_ACTIVE_HIGH>;
+	};
 };
 
 &wkup_pmx0 {
@@ -129,6 +143,12 @@ AM65X_WKUP_IOPAD(0x00cc, PIN_OUTPUT, 1)	/* (AC1) WKUP_GPIO0_7.WKUP_UART0_RTSn */
 		>;
 	};
 
+	ddr_vtt_pins_default: ddr-vtt-pins-default {
+		pinctrl-single,pins = <
+			AM65X_WKUP_IOPAD(0x0040, PIN_OUTPUT_PULLUP, 7)	/* WKUP_GPIO0_28 */
+		>;
+	};
+
 	wkup_i2c0_pins_default: wkup-i2c0-pins-default {
 		pinctrl-single,pins = <
 			AM65X_WKUP_IOPAD(0x00e0, PIN_INPUT, 0) /* (AC7) WKUP_I2C0_SCL */
-- 
2.40.0