dt-bindings: iio: dac: Add adi,ad3530r.yaml

Document the AD3530/AD3530R (8-channel) and AD3531/AD3531R (4-channel)
low-power, 16-bit, buffered voltage output DACs with software-
programmable gain controls. They provide full-scale output spans of 2.5V
or 5V for reference voltages of 2.5V. These devices operate on a single
2.7V to 5.5V supply and are guaranteed to be monotonic by design.
The "R" variants include a 2.5V, 5ppm/°C internal reference, which is
disabled by default.

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: David Lechner <[e-mail]>
Signed-off-by: Kim Seer Paller <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/adi,ad3530r.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD3530R and Similar DACs
+
+maintainers:
+  - Kim Seer Paller <[e-mail]>
+
+description: |
+  The AD3530/AD3530R (8-channel) and AD3531/AD3531R (4-channel) are low-power,
+  16-bit, buffered voltage output digital-to-analog converters (DACs) with
+  software-programmable gain controls, providing full-scale output spans of 2.5V
+  or 5V for reference voltages of 2.5V. These devices operate from a single 2.7V
+  to 5.5V supply and are guaranteed monotonic by design. The "R" variants
+  include a 2.5V, 5ppm/°C internal reference, which is disabled by default.
+  Datasheet can be found here:
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad3530_ad530r.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad3531-ad3531r.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad3530
+      - adi,ad3530r
+      - adi,ad3531
+      - adi,ad3531r
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 50000000
+
+  vdd-supply:
+    description: Power Supply Input.
+
+  iovdd-supply:
+    description: Digital Power Supply Input.
+
+  io-channels:
+    description:
+      ADC channel used to monitor internal die temperature, output voltages, and
+      current of a selected channel via the MUXOUT pin.
+    maxItems: 1
+
+  ref-supply:
+    description:
+      Reference Input/Output. The voltage at the REF pin sets the full-scale
+      range of all channels. If not provided the internal reference is used and
+      also provided on the VREF pin.
+
+  reset-gpios:
+    description:
+      Active low signal that is falling edge sensitive. When it is deasserted,
+      the digital core initialization is performed and all DAC registers except
+      the Interface Configuration A register are reset to their default values.
+    maxItems: 1
+
+  ldac-gpios:
+    description:
+      LDAC pin to be used as a hardware trigger to update the DAC channels. If
+      not present, the DAC channels are updated by Software LDAC.
+    maxItems: 1
+
+  adi,range-double:
+    description:
+      Configure the output range for all channels. If the property is present,
+      the output will range from 0V to 2Vref. If the property is not present,
+      the output will range from 0V to Vref.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - iovdd-supply
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        dac@0 {
+            compatible = "adi,ad3530r";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+
+            vdd-supply = <&vdd>;
+            iovdd-supply = <&iovdd>;
+        };
+    };
+...

MAINTAINERS

···
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
 F:	drivers/net/amt.c
 
+ANALOG DEVICES INC AD3530R DRIVER
+M:	Kim Seer Paller <[e-mail]>
+L:	[e-mail]
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
+
 ANALOG DEVICES INC AD3552R DRIVER
 M:	Nuno Sá <[e-mail]>
 L:	[e-mail]