linux-kernel - [PATCH v2 3/4] dt-bindings: iio: dac: Add adi,ad3530r.yaml

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Message-ID: <20250324-togreg-v2-3-f211d781923e@analog.com>
Date: Mon, 24 Mar 2025 19:22:57 +0800
From: Kim Seer Paller <kimseer.paller@...log.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        Kim Seer Paller <kimseer.paller@...log.com>
Subject: [PATCH v2 3/4] dt-bindings: iio: dac: Add adi,ad3530r.yaml

Document the AD3530R/AD3530, an 8-Channel, 16-bit Voltage Output DAC,
while the AD3531R/AD3531 is a 4-Channel, 16-Bit Voltage Output DAC.
These devices include software-programmable gain controls that provide
full-scale output spans of 2.5V or 5V for reference voltages of 2.5V.
They operate from a single supply voltage range of 2.7V to 5.5V and are
guaranteed to be monotonic by design. Additionally, these devices
features a 2.5V, 5ppm/°C internal reference, which is disabled by default.

Signed-off-by: Kim Seer Paller <kimseer.paller@...log.com>
---
 .../devicetree/bindings/iio/dac/adi,ad3530r.yaml   | 91 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 92 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..e581472b50048bedda7422748035423b9b020382
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
@@ -0,0 +1,91 @@
+# 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 <kimseer.paller@...log.com>
+
+description: |
+  The AD3530/AD3530R are low power, 8-channel, 16-bit, buffered voltage output,
+  digital-to-analog converters (DACs) that include software-programmable gain
+  controls that result in full-scale output spans of 2.5V or 5V for reference
+  voltages of 2.5V. The devices operate from single, 2.7V to 5.5V supply ranges
+  and are guaranteed monotonic by design. The AD3530R also offers a 2.5V,
+  5ppm/°C internal reference that is disabled by default.
+  Datasheet can be found here:
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad3530_ad530r.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad3530r
+      - adi,ad3531r
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 50000000
+
+  vdd-supply:
+    description: Power Supply Input.
+
+  iovdd-supply:
+    description: Digital Power Supply Input.
+
+  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#
+
+additionalProperties: 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>;
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 2d3c31c74594ca1934c67e7aad0a179feeaa39bf..7862469226f52375adc219115ef68d03662127be 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1295,6 +1295,7 @@ L:	linux-iio@...r.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/ABI/testing/sysfs-bus-iio-dac-ad3530r
+F:	Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
 
 ANALOG DEVICES INC AD3552R DRIVER
 M:	Nuno Sá <nuno.sa@...log.com>

-- 
2.34.1