dt-bindings: iio: dac: Add MAX22007 DAC bindings

Add device tree bindings header for the MAX22007 4-channel 12-bit DAC.
Defines constants for channel modes and other configuration options.

Signed-off-by: Janani Sunil <[email protected]>

Author: jansunil

Documentation/devicetree/bindings/iio/dac/adi,max22007.yaml

@@ -0,0 +1,132 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/adi,max22007.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX22007 DAC device driver
+
+maintainers:
+  - Janani Sunil <[email protected]>
+
+description: |
+  The MAX22007 is a quad-channel, 12-bit digital-to-analog converter (DAC)
+  with integrated precision output amplifiers and current output capability.
+  Each channel can be independently configured for voltage or current output.
+  The driver supports runtime LDAC (Latch DAC) control via per-channel sysfs
+  attributes for precise output timing control.
+  Datasheet available at:
+  https://www.analog.com/en/products/max22007.html
+
+properties:
+  compatible:
+    const: adi,max22007
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 500000
+    description: Maximum SPI clock frequency in Hz.
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  vdd-supply:
+    description: Low-Voltage Power Supply from +2.7V to +5.5V.
+
+  hvdd-supply:
+    description: |
+      Positive High-Voltage Power Supply from +8V to (HVSS +24V) for
+      the Output Channels.
+
+  hvss-supply:
+    description: |
+      Negative High-Voltage Power Supply from -2V to 0V for the Output Channels.
+
+  adi,crc-enable:
+    type: boolean
+    description: |
+      Enable CRC8 error checking for SPI communications. When enabled, all SPI
+      transactions include a CRC8 byte for data integrity verification.
+
+patternProperties:
+  "^channel@[0-3]$":
+    type: object
+    description: |
+      Represents the external channels which are connected to the DAC.
+      Channels not specified in the device tree will be powered off.
+    properties:
+      reg:
+        description: |
+          This represents the channel number.
+        maximum: 3
+
+      adi,dac-latch-mode:
+        description: |
+          DAC latch control mode for the channel.
+          0 = LD_CTRL Bit in the control register or LDAC Pin controls the update (default)
+          1 = Transparent latch mode (immediate update)
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [0, 1]
+
+      adi,mode:
+        description: |
+          Output mode for the channel.
+          0 = Voltage output mode (default)
+          1 = Current output mode
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [0, 1]
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+anyOf:
+  - required: [channel@0]
+  - required: [channel@1]
+  - required: [channel@2]
+  - required: [channel@3]
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/iio/dac/adi,max22007.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dac@0 {
+            compatible = "adi,max22007";
+            reg = <0>;
+            spi-max-frequency = <500000>;
+            adi,crc-enable;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            channel@0 {
+                reg = <0>;
+                adi,mode = <0>;
+                adi,dac-latch-mode = <MAX22007_LDAC_CONTROL>;
+            };
+
+            channel@1 {
+                reg = <1>;
+                adi,mode = <0>;
+                adi,dac-latch-mode = <MAX22007_TRANSPARENT_LATCH>;
+            };
+        };
+    };
+...

include/dt-bindings/iio/dac/adi,max22007.h

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+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef _DT_BINDINGS_ADI_MAX22007_H
+#define _DT_BINDINGS_ADI_MAX22007_H
+
+#define MAX22007_LDAC_CONTROL		0
+#define MAX22007_TRANSPARENT_LATCH	1
+
+#endif /* _DT_BINDINGS_ADI_MAX22007_H */