[linux dev-4.19 12/15] dt-binding: iio: add NPCM ADC documentation

[Tomer Maimon <tmaimon77@gmail.com>]

Added device tree binding documentation for Nuvoton BMC
NPCM Analog-to-Digital Converter(ADC).

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 .../bindings/iio/adc/nuvoton,npcm-adc.txt          | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,npcm-adc.txt

diff --git a/Documentation/devicetree/bindings/iio/adc/nuvoton,npcm-adc.txt b/Documentation/devicetree/bindings/iio/adc/nuvoton,npcm-adc.txt
new file mode 100644
index 000000000000..6f0843d837cc
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/nuvoton,npcm-adc.txt
@@ -0,0 +1,35 @@
+Nuvoton NPCM Analog to Digital Converter (ADC)
+
+The NPCM ADC is a 10-bit converter for eight channel inputs.
+
+Required properties:
+- compatible	: "nuvoton,npcm750-adc" for the NPCM7XX BMC.
+- reg			: specifies physical base address and size of the registers.
+- interrupts	: Contain the ADC interrupt with flags for falling edge.
+
+Optional properties:
+- clocks		: phandle of ADC reference clock, in case the clock is not
+				  added the ADC will use the default ADC sample rate.
+- vref-supply	: The regulator supply ADC reference voltage, in case the
+				  vref-supply is not added the ADC will use internal voltage
+				  reference.
+
+Required Node in the NPCM7xx BMC:
+An additional register is present in the NPCM7xx SOC which is
+assumed to be in the same device tree, with and marked as
+compatible with "nuvoton,npcm750-rst".
+
+Example:
+
+adc: adc@f000c000 {
+	compatible = "nuvoton,npcm750-adc";
+	reg = <0xf000c000 0x8>;
+	interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
+	clocks = <&clk NPCM7XX_CLK_ADC>;
+};
+
+rst: rst@f0801000 {
+	compatible = "nuvoton,npcm750-rst", "syscon",
+	"simple-mfd";
+	reg = <0xf0801000 0x6C>;
+};
-- 
2.14.1