dt-bindings: iio: Add Spreadtrum SC27XX PMICs ADC controller documentation

This patch adds the binding documentation for Spreadtrum SC27XX series
PMICs ADC controller device.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/devicetree/bindings/iio/adc/sprd,sc27xx-adc.txt b/Documentation/devicetree/bindings/iio/adc/sprd,sc27xx-adc.txt
new file mode 100644 (file)
index 0000000..8aad960
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/sprd,sc27xx-adc.txt
@@ -0,0 +1,36 @@
+Spreadtrum SC27XX series PMICs ADC binding
+
+Required properties:
+- compatible: Should be one of the following.
+       "sprd,sc2720-adc"
+       "sprd,sc2721-adc"
+       "sprd,sc2723-adc"
+       "sprd,sc2730-adc"
+       "sprd,sc2731-adc"
+- reg: The address offset of ADC controller.
+- interrupt-parent: The interrupt controller.
+- interrupts: The interrupt number for the ADC device.
+- #io-channel-cells: Number of cells in an IIO specifier.
+- hwlocks: Reference to a phandle of a hwlock provider node.
+
+Example:
+
+       sc2731_pmic: pmic@0 {
+               compatible = "sprd,sc2731";
+               reg = <0>;
+               spi-max-frequency = <26000000>;
+               interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               pmic_adc: adc@480 {
+                       compatible = "sprd,sc2731-adc";
+                       reg = <0x480>;
+                       interrupt-parent = <&sc2731_pmic>;
+                       interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+                       #io-channel-cells = <1>;
+                       hwlocks = <&hwlock 4>;
+               };
+       };