regulator: add binding for the SY8106A voltage regulator

SY8106A is an I2C-controlled adjustable voltage regulator made by
Silergy Corp.

Add its device tree binding.

Signed-off-by: Ondrej Jirman <megous@megous.com>
[Icenowy: Change commit message and slight fixes]
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt b/Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt
new file mode 100644 (file)
index 0000000..39a8ca7
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt
@@ -0,0 +1,23 @@
+SY8106A Voltage regulator
+
+Required properties:
+- compatible: Must be "silergy,sy8106a"
+- reg: I2C slave address - must be <0x65>
+- silergy,fixed-microvolt - the voltage when I2C regulating is disabled (set
+  by external resistor like a fixed voltage)
+
+Any property defined as part of the core regulator binding, defined in
+./regulator.txt, can also be used.
+
+Example:
+
+       sy8106a {
+               compatible = "silergy,sy8106a";
+               reg = <0x65>;
+               regulator-name = "sy8106a-vdd";
+               silergy,fixed-microvolt = <1200000>;
+               regulator-min-microvolt = <1000000>;
+               regulator-max-microvolt = <1400000>;
+               regulator-boot-on;
+               regulator-always-on;
+       };