[PATCH v7 1/3] dt-bindings: iio: adc: add a7779 doc

[Ramona Alexandra Nechita]

Add dt bindings for AD7779 8-channel, simultaneous sampling ADC
family with eight full Σ-Δ ADCs on chip and ultra-low input
current to allow direct sensor connection.

Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@xxxxxxxxxx>
---
 .../bindings/iio/adc/adi,ad7779.yaml          | 110 ++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
new file mode 100644
index 000000000000..044f92f39cfa
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7779.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD777X family 8-Channel, 24-Bit, Simultaneous Sampling ADCs
+
+maintainers:
+  - Ramona Nechita <ramona.nechita@xxxxxxxxxx>
+
+description: |
+  The AD777X family consist of 8-channel, simultaneous sampling analog-to-
+  digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The
+  AD7771 provides an ultralow input current to allow direct sensor
+  connection. Each input channel has a programmable gain stage
+  allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor
+  outputs into the full-scale ADC input range, maximizing the
+  dynamic range of the signal chain.
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7770.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7771.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7779.pdf
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7770
+      - adi,ad7771
+      - adi,ad7779
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  avdd1-supply:
+    description: Front-End analog supply AVDD1. Can be used as conversion ref.
+
+  avdd2-supply:
+    description: AVDD2 Analog Supply from 2.2 V to 3.6 V.
+
+  avdd4-supply:
+    description: AVDD4 SAR Analog Supply and Reference Source.
+
+  interrupts:
+    minItems: 1
+    items:
+      - description: |
+          adc_rdy: Interrupt line for DRDY signal which indicates the end of
+          conversion independently of the interface selected to read back the
+          Σ-∆ conversion.
+      - description: |
+          Alert: The chip includes self diagnostic features to guarantee the
+          correct operation. If an error is detected, the ALERT pin is pulled
+          high to generate an external interruption to the controller.
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      enum:
+        - adc_rdy
+        - alert
+
+  start-gpios:
+    description:
+      Pin that controls start synchronization pulse.
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+          compatible = "adi,ad7779";
+          reg = <0>;
+          start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
+          reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>;
+          interrupt-parent = <&intc>;
+          interrupts = <0 56 IRQ_TYPE_LEVEL_HIGH>;
+          interrupt-names = "adc_rdy";
+          clocks = <&adc_clk>;
+        };
+    };
+...
-- 
2.43.0