dt-bindings: iio/adc: Convert ingenic-adc docs to YAML.

Convert the textual documentation of Device Tree bindings for the
Ingenic JZ47xx SoCs ADC controller to YAML.

The `interrupts` property is now explicitly listed and marked as
required. While missing from the previous textual documentation, this
property has been used with all the boards which probe this driver.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Tested-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
new file mode 100644
index 000000000000..9f414dbdae86
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019-2020 Artur Rojek
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/iio/adc/ingenic,adc.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Ingenic JZ47xx ADC controller IIO bindings
+
+maintainers:
+  - Artur Rojek <contact@artur-rojek.eu>
+
+description: >
+  Industrial I/O subsystem bindings for ADC controller found in
+  Ingenic JZ47xx SoCs.
+
+  ADC clients must use the format described in iio-bindings.txt, giving
+  a phandle and IIO specifier pair ("io-channels") to the ADC controller.
+
+properties:
+  compatible:
+    enum:
+      - ingenic,jz4725b-adc
+      - ingenic,jz4740-adc
+      - ingenic,jz4770-adc
+
+  '#io-channel-cells':
+    const: 1
+    description:
+      Must be set to <1> to indicate channels are selected by index.
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: adc
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - '#io-channel-cells'
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/jz4740-cgu.h>
+    #include <dt-bindings/iio/adc/ingenic,adc.h>
+
+    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>;
+    };