arm64: dts: imx8mq: Add the buck vdd_arm regulator

According to the schematics, this is a MP2147 switch converter
which is controlled by GPIO1_IO13. When set the gpio is set to
high the regulator output is set to 0.9V. When the gpio is set
to low the regulator output is set to 1V.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
index 54737bf..afea110 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
@@ -31,6 +31,34 @@
                gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
                enable-active-high;
        };
+
+       buck2_reg: regulator-buck2 {
+               pinctrl-names = "default";
+               pinctrl-0 = <&pinctrl_buck2>;
+               compatible = "regulator-gpio";
+               regulator-name = "vdd_arm";
+               regulator-min-microvolt = <900000>;
+               regulator-max-microvolt = <1000000>;
+               gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
+               states = <1000000 0x0
+                         900000 0x1>;
+       };
+};
+
+&A53_0 {
+       cpu-supply = <&buck2_reg>;
+};
+
+&A53_1 {
+       cpu-supply = <&buck2_reg>;
+};
+
+&A53_2 {
+       cpu-supply = <&buck2_reg>;
+};
+
+&A53_3 {
+       cpu-supply = <&buck2_reg>;
 };
 
 &fec1 {
@@ -203,6 +231,13 @@
 };
 
 &iomuxc {
+       pinctrl_buck2: vddarmgrp {
+               fsl,pins = <
+                       MX8MQ_IOMUXC_GPIO1_IO13_GPIO1_IO13              0x19
+               >;
+
+       };
+
        pinctrl_fec1: fec1grp {
                fsl,pins = <
                        MX8MQ_IOMUXC_ENET_MDC_ENET1_MDC                 0x3