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+MediaTek MT6397/MT6323 Multifunction Device Driver
+
+MT6397/MT6323 is a multifunction device with the following sub modules:
+- Regulator
+- RTC
+- Audio codec
+- GPIO
+- Clock
+- LED
+- Keys
+- Power controller
+
+It is interfaced to host controller using SPI interface by a proprietary hardware
+called PMIC wrapper or pwrap. MT6397/MT6323 MFD is a child device of pwrap.
+See the following for pwarp node definitions:
+../soc/mediatek/mediatek,pwrap.yaml
+
+This document describes the binding for MFD device and its sub module.
+
+Required properties:
+compatible:
+	"mediatek,mt6323" for PMIC MT6323
+	"mediatek,mt6331" for PMIC MT6331 and MT6332
+	"mediatek,mt6357" for PMIC MT6357
+	"mediatek,mt6358" for PMIC MT6358
+	"mediatek,mt6359" for PMIC MT6359
+	"mediatek,mt6366", "mediatek,mt6358" for PMIC MT6366
+	"mediatek,mt6397" for PMIC MT6397
+
+Optional subnodes:
+
+- rtc
+	Required properties: Should be one of follows
+		- compatible: "mediatek,mt6323-rtc"
+		- compatible: "mediatek,mt6331-rtc"
+		- compatible: "mediatek,mt6358-rtc"
+		- compatible: "mediatek,mt6397-rtc"
+	For details, see ../rtc/rtc-mt6397.txt
+- regulators
+	Required properties:
+		- compatible: "mediatek,mt6323-regulator"
+	see ../regulator/mt6323-regulator.txt
+		- compatible: "mediatek,mt6358-regulator"
+		- compatible: "mediatek,mt6366-regulator", "mediatek-mt6358-regulator"
+	see ../regulator/mt6358-regulator.txt
+		- compatible: "mediatek,mt6397-regulator"
+	see ../regulator/mt6397-regulator.txt
+- codec
+	Required properties:
+		- compatible: "mediatek,mt6397-codec" or "mediatek,mt6358-sound"
+- clk
+	Required properties:
+		- compatible: "mediatek,mt6397-clk"
+- led
+	Required properties:
+		- compatible: "mediatek,mt6323-led"
+	see ../leds/leds-mt6323.txt
+
+- keys
+	Required properties: Should be one of the following
+		- compatible: "mediatek,mt6323-keys"
+		- compatible: "mediatek,mt6331-keys"
+		- compatible: "mediatek,mt6397-keys"
+	see ../input/mtk-pmic-keys.txt
+
+- power-controller
+	Required properties:
+		- compatible: "mediatek,mt6323-pwrc"
+	For details, see ../power/reset/mt6323-poweroff.txt
+
+- pin-controller
+	Required properties:
+		- compatible: "mediatek,mt6397-pinctrl"
+	For details, see ../pinctrl/pinctrl-mt65xx.txt
+
+Example:
+	pwrap: pwrap@1000f000 {
+		compatible = "mediatek,mt8135-pwrap";
+
+		...
+
+		pmic {
+			compatible = "mediatek,mt6397";
+
+			codec: mt6397codec {
+				compatible = "mediatek,mt6397-codec";
+			};
+
+			regulators {
+				compatible = "mediatek,mt6397-regulator";
+
+				mt6397_vpca15_reg: buck_vpca15 {
+					regulator-compatible = "buck_vpca15";
+					regulator-name = "vpca15";
+					regulator-min-microvolt = <850000>;
+					regulator-max-microvolt = <1400000>;
+					regulator-ramp-delay = <12500>;
+					regulator-always-on;
+				};
+
+				mt6397_vgp4_reg: ldo_vgp4 {
+					regulator-compatible = "ldo_vgp4";
+					regulator-name = "vgp4";
+					regulator-min-microvolt = <1200000>;
+					regulator-max-microvolt = <3300000>;
+					regulator-enable-ramp-delay = <218>;
+				};
+			};
+		};
+	};