Add documentation for the ADC controller on JZ47xx SoCs,
used by the ingenic-adc driver.
Signed-off-by: Artur Rojek <contact@xxxxxxxxxxxxxx>
---
.../bindings/iio/adc/ingenic,adc.txt | 48 +++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/ingenic,adc.txt
diff --git a/Documentation/devicetree/bindings/iio/adc/ingenic,adc.txt b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.txt
new file mode 100644
index 000000000000..884f459bb9b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.txt
@@ -0,0 +1,48 @@
+* Ingenic JZ47xx ADC controller IIO bindings
+
+Required properties:
+
+- compatible: Should be one of:
+ * ingenic,jz4725b-adc
+ * ingenic,jz4740-adc
+- reg: ADC controller registers location and length.
+- clocks: phandle to the SoC's ADC clock.
+- clock-names: Must be set to "adc".
+- #io-channel-cells: Must be set to <1> to indicate channels are selected
+ by index.
+
+ADC clients must use the format described in iio-bindings.txt, giving
+a phandle and IIO specifier pair ("io-channels") to the ADC controller.
+
+Example:
+
+#include <dt-bindings/iio/adc/ingenic,adc.h>
+
+adc: adc@10070000 {
+ compatible = "ingenic,jz4740-adc";
+ #io-channel-cells = <1>;
+
+ reg = <0x10070000 0x30>;
+
+ clocks = <&cgu JZ4740_CLK_ADC>;
+ clock-names = "adc";
+
+ interrupt-parent = <&intc>;
+ interrupts = <18>;
+};
+
+adc-keys {
+ ...
+ compatible = "adc-keys";
+ io-channels = <&adc INGENIC_ADC_AUX>;
+ io-channel-names = "buttons";
+ ...
+};
+
+battery {
+ ...
+ compatible = "ingenic,jz4740-battery",
+ io-channels = <&adc INGENIC_ADC_BATTERY>;
+ io-channel-names = "battery";
+ ...
+};
--
2.20.1
