linux-kernel - [PATCH] ARM: dts: imx6qdl-gw52xx: add CAN regulator

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Message-Id: <20220912215312.964722-1-tharvey@gateworks.com>
Date:   Mon, 12 Sep 2022 14:53:12 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     NXP Linux Team <linux-imx@....com>,
        Fabio Estevam <festevam@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tim Harvey <tharvey@...eworks.com>
Subject: [PATCH] ARM: dts: imx6qdl-gw52xx: add CAN regulator

The GW52xx has a tranceiver with a STBY pin connected to an IMX6 GPIO.
Configure this as a regulator to drive it low when CAN is in use.

Signed-off-by: Tim Harvey <tharvey@...eworks.com>
---
 arch/arm/boot/dts/imx6qdl-gw52xx.dtsi | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
index b1df2beb2832..ec6b55bf77d9 100644
--- a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
@@ -137,6 +137,16 @@ reg_5p0v: regulator-5p0v {
 		regulator-always-on;
 	};
 
+	reg_can1_stby: regulator-can1-stby {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_reg_can1>;
+		compatible = "regulator-fixed";
+		regulator-name = "can1_stby";
+		gpio = <&gpio1 9 GPIO_ACTIVE_LOW>;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+	};
+
 	reg_usb_otg_vbus: regulator-usb-otg-vbus {
 		compatible = "regulator-fixed";
 		regulator-name = "usb_otg_vbus";
@@ -170,6 +180,7 @@ &audmux {
 &can1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_flexcan1>;
+	xceiver-supply = <&reg_can1_stby>;
 	status = "okay";
 };
 
@@ -612,7 +623,6 @@ pinctrl_flexcan1: flexcan1grp {
 		fsl,pins = <
 			MX6QDL_PAD_KEY_ROW2__FLEXCAN1_RX	0x1b0b1
 			MX6QDL_PAD_KEY_COL2__FLEXCAN1_TX	0x1b0b1
-			MX6QDL_PAD_GPIO_9__GPIO1_IO09		0x4001b0b0 /* CAN_STBY */
 		>;
 	};
 
@@ -702,6 +712,12 @@ MX6QDL_PAD_SD1_CMD__PWM4_OUT		0x1b0b1
 		>;
 	};
 
+	pinctrl_reg_can1: regcan1grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_9__GPIO1_IO09		0x4001b0b0 /* CAN_STBY */
+		>;
+	};
+
 	pinctrl_uart1: uart1grp {
 		fsl,pins = <
 			MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA	0x1b0b1
-- 
2.25.1