[PATCH 5/7] dt-bindings: iio: Add binding documentation for AD7091R-8

[<marcelo.schmitt@analog.com>]

From: Marcelo Schmitt <marcelo.schmitt@analog.com>

Add device tree binding documentation for AD7091R-8.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
---
 .../bindings/iio/adc/adi,ad7091r8.yaml        | 101 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 2 files changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml
new file mode 100644
index 000000000000..f10b6727737f
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7091r8.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7091R8 8-Channel 12-Bit ADC
+
+maintainers:
+  - Marcelo Schmitt <marcelo.schmitt@analog.com>
+
+description: |
+  Analog Devices AD7091R-8 8-Channel 12-Bit ADC
+  https://www.analog.com/media/en/technical-documentation/data-sheets/AD7091R-2_7091R-4_7091R-8.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7091r2
+      - adi,ad7091r4
+      - adi,ad7091r8
+
+  reg:
+    maxItems: 1
+
+  vref-supply: true
+
+  spi-max-frequency: true
+
+  adi,conversion-start-gpios:
+    description:
+      Device tree identifier of the CONVST pin.
+      This logic input is used to initiate conversions on the analog
+      input channels.
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - adi,conversion-start-gpios
+
+patternProperties:
+  "^channel@[0-7]$":
+    $ref: "adc.yaml"
+    type: object
+    description: Represents the external channels which are connected to the ADC.
+
+    properties:
+      reg:
+        minimum: 0
+        maximum: 7
+
+    required:
+      - reg
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+  # AD7091R-2 does not have ALERT/BUSY/GPO pin
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,ad7091r4
+              - adi,ad7091r8
+    then:
+      properties:
+        interrupts: true
+    else:
+      properties:
+        interrupts: false
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+                compatible = "adi,ad7091r8";
+                reg = <0x0>;
+                spi-max-frequency = <45454545>;
+                vref-supply = <&adc_vref>;
+                adi,conversion-start-gpios = <&gpio 25 GPIO_ACTIVE_LOW>;
+                reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
+                interrupts = <22 IRQ_TYPE_EDGE_FALLING>;
+                interrupt-parent = <&gpio>;
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 008f0e73bead..6e7c6c866396 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1132,6 +1132,7 @@ L:	linux-iio@vger.kernel.org
 S:	Supported
 W:	http://ez.analog.com/community/linux-device-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad7091r5.yaml
+F:	Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml
 F:	drivers/iio/adc/drivers/iio/adc/ad7091r-base.c
 F:	drivers/iio/adc/drivers/iio/adc/ad7091r-base.h
 F:	drivers/iio/adc/drivers/iio/adc/ad7091r5.c
-- 
2.42.0