mfd: dt-bindings: Add bindings for the MediaTek MT6397 PMIC

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/mfd/mt6397.txt b/Documentation/devicetree/bindings/mfd/mt6397.txt
new file mode 100644 (file)
index 0000000..15043e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mt6397.txt
@@ -0,0 +1,70 @@
+MediaTek MT6397 Multifunction Device Driver
+
+MT6397 is a multifunction device with the following sub modules:
+- Regulator
+- RTC
+- Audio codec
+- GPIO
+- Clock
+
+It is interfaced to host controller using SPI interface by a proprietary hardware
+called PMIC wrapper or pwrap. MT6397 MFD is a child device of pwrap.
+See the following for pwarp node definitions:
+Documentation/devicetree/bindings/soc/pwrap.txt
+
+This document describes the binding for MFD device and its sub module.
+
+Required properties:
+compatible: "mediatek,mt6397"
+
+Optional subnodes:
+
+- rtc
+       Required properties:
+               - compatible: "mediatek,mt6397-rtc"
+- regulators
+       Required properties:
+               - compatible: "mediatek,mt6397-regulator"
+       see Documentation/devicetree/bindings/regulator/mt6397-regulator.txt
+- codec
+       Required properties:
+               - compatible: "mediatek,mt6397-codec"
+- clk
+       Required properties:
+               - compatible: "mediatek,mt6397-clk"
+
+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>;
+                               };
+                       };
+               };
+       };