[PATCH v4 2/3] dt-bindings: iio: dac: Add adi,ad3530r.yaml

Kim Seer Paller
2025-04-12T05:58:38Z

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 <krzysztof.kozlowski@linaro.org>
Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
.../devicetree/bindings/iio/dac/adi,ad3530r.yaml | 100 +++++++++++++++++++++
MAINTAINERS | 7 ++
2 files changed, 107 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..a355d52a9d641e488fe291b97bc95ed115e96afd
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
@@ -0,0 +1,100 @@
+# 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@analog.com>
+
+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>;
+ };
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index ffdb3f21fc4fb35b349449afbb30fecd4fe72978..9deaf2561ade5b1319cef3cb31b997a4297c0cff 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1289,6 +1289,13 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
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 <kimseer.paller@analog.com>
+L: linux-iio@vger.kernel.org
+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 <nuno.sa@analog.com>
L: linux-iio@vger.kernel.org

--
2.34.1