arch: dts: overlays: Add MAX22531 Overlay

Add device tree overlay for MAX22531 device.

Signed-off-by: Abhinav Jain <jain.abhinav177@gmail.com>

Author: psychild

arch/arm/boot/dts/overlays/Makefile

@@ -311,6 +311,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	rpi-ltc6952.dtbo \
 	rpi-max14830-i2c.dtbo \
 	rpi-max14830-spi.dtbo \
+	rpi-max22531.dtbo \
 	rpi-max31335.dtbo \
 	rpi-poe.dtbo \
 	rpi-poe-plus.dtbo \

arch/arm/boot/dts/overlays/rpi-max22531-overlay.dts

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: (GPL-2.0+)
+/*
+ * Device Tree Overlay for MAX22531 
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835", "brcm,bcm2711", "brcm,bcm2712";
+
+	vddl_1v8: fixedregulator@0 {
+		compatible = "regulator-fixed";
+		regulator-name = "Power Input for the Logic-Side";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
+	vddpl_3v3: fixedregulator@1 {
+		compatible = "regulator-fixed";
+		regulator-name = "Power Input for the Isolated DC-DC Converter";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	max22531@0 {
+		compatible = "adi,max22531";
+		reg = <0>;	/* Using CS0 on spi0 */
+		spi-max-frequency = <5000000>;
+		vddl-supply = <&vddl_1v8>;
+		vddpl-supply = <&vddpl_3v3>;
+	};
+};