[PATCH v3 1/2] dt-bindings: iio: adc: ti,ads7038: Add description for ADS7038

[werneazc@gmail.com]

From: Andre Werner <andre.werner@systec-electronic.com>

Add basic description for ADS7038 ADC devices.
The devicetree adds the following device specific options:

- average-samples: Program device's programmable average filter.
- crc-enabled: Enable the CRC check for SPI transfers. Sadly, this
  option has currently no effect in the driver.
- status-enabled: Enable the appending of the device's status on the
  measure value transmission.
- gpio-controller: Sadly function not implemented yet in the driver.

Signed-off-by: Andre Werner <andre.werner@systec-electronic.com>
---
v3:
- Delete ADS7138 compatible and comments.
- Add options for CRC, status and average samples as well as
  gpio-controller.
- Update example.
---
 .../bindings/iio/adc/ti,ads7038.yaml          | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
new file mode 100644
index 000000000000..323f86c5e682
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads7038.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADS7038 and similar ADCs
+
+maintainers:
+  - Andre Werner <andre.werner@systec-electronic.com>
+
+description: |
+  Family of 7 channel, 12 bit ADCs with SPI interface.
+
+  Datasheet: https://www.ti.com/lit/gpn/ads7038
+
+properties:
+  compatible:
+    enum:
+      - ti,ads7038
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 60000000
+
+  avdd-supply:
+    description: Analog supply voltage, also used as the reference voltage to the ADC.
+
+  dvdd-supply:
+    description: Digital I/O supply voltage.
+
+  average-samples:
+    description: |
+      If specified ADC is configured for avaraging measurements (OSR_CFG Register).
+      This effects output format for measurement and sampling time.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0,1,2,3,4,5,6,7]
+
+  status-enabled:
+    description: |
+      If specified ADC transmits chip status (DATA_CFG Register).
+
+  crc-enabled:
+    description: |
+      Checking the integrity of the data bits exchanged over
+      SPI interface (GENERAL_CFG Register).
+
+  gpio-controller:
+    const: true
+    decription: Marks the device node as a GPIO controller.
+
+  "#gpio-cells":
+    const: 2
+    description: Should be 2. See gpio.txt in this directory for a
+                 description of the cells format.
+
+required:
+  - compatible
+  - reg
+  - avdd-supply
+  - dvdd-supply
+  - gpio-controller
+  - #gpio-cells
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "ti,ads7038";
+            reg = <0>;
+            avdd-supply = <&refin_avdd_supply>;
+            avdd-supply = <&refin_dvdd_supply>;
+            spi-max-frequency = <10000000>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };
-- 
2.42.0