[PATCH v1 1/3] dt-bindings: iio: adc: Add AD4134

Marcelo Schmitt
2025-11-10T12:45:41Z

Add device tree documentation for AD4134 24-Bit, 4-channel simultaneous
sampling, precision ADC.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
---
.../bindings/iio/adc/adi,ad4134.yaml | 209 ++++++++++++++++++
MAINTAINERS | 7 +
2 files changed, 216 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
new file mode 100644
index 000000000000..a758d2542ab0
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
@@ -0,0 +1,209 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad4134.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD4134 ADC
+
+maintainers:
+ - Marcelo Schmitt <marcelo.schmitt@analog.com>
+
+description: |
+ The AD4134 is a quad channel, low noise, simultaneous sampling, precision
+ analog-to-digital converter (ADC).
+ Specifications can be found at:
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad4134.pdf
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+ compatible:
+ enum:
+ - adi,ad4134
+
+ reg:
+ maxItems: 1
+
+ spi-max-frequency:
+ maximum: 50000000
+
+ avdd5-supply:
+ description: A 5V supply that powers the chip's analog circuitry.
+
+ dvdd5-supply:
+ description: A 5V supply that powers the chip's digital circuitry.
+
+ iovdd-supply:
+ description:
+ A 1.8V supply that sets the logic levels for the digital interface pins.
+
+ refin-supply:
+ description:
+ A 4.096V or 5V supply that serves as reference for ADC conversions.
+
+ avdd1v8-supply:
+ description: A 1.8V supply used by the analog circuitry.
+
+ dvdd1v8-supply:
+ description: A 1.8V supply used by the digital circuitry.
+
+ clkvdd-supply:
+ description: A 1.8V supply for the chip's clock management circuit.
+
+ ldoin-supply:
+ description:
+ A 2.6V to 5.5V supply that generates 1.8V for AVDD1V8, DVDD1V8, and CLKVDD
+ pins.
+
+ clocks:
+ maxItems: 1
+ description:
+ Required external clock source. Can specify either a crystal or CMOS clock
+ source. If an external crystal is set, connect the CLKSEL pin to IOVDD.
+ Otherwise, connect the CLKSEL pin to IOGND and the external CMOS clock
+ signal to the XTAL2/CLKIN pin.
+
+ clock-names:
+ enum:
+ - xtal1-xtal2
+ - clkin
+ default: clkin
+
+ '#clock-cells':
+ const: 0
+
+ clock-output-names:
+ maxItems: 1
+
+ regulators:
+ type: object
+ description:
+ list of regulators provided by this controller.
+
+ properties:
+ vcm-output:
+ $ref: /schemas/regulator/regulator.yaml#
+ type: object
+ unevaluatedProperties: false
+
+ additionalProperties: false
+
+ reset-gpios:
+ maxItems: 1
+
+ powerdown-gpios:
+ description:
+ Active low GPIO connected to the /PDN pin. Forces the device into full
+ power-down mode when broght low. Pull this input to IOVDD for normal
+ operation.
+ maxItems: 1
+
+ odr-gpios:
+ description:
+ GPIO connected to ODR pin. Used to sample ADC data in minimum I/O mode.
+ maxItems: 1
+
+ adi,control-mode:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ Describes whether the device is wired to an SPI interface or not. The
+ PIN/SPI pin on the device must be set accordingly, i.e., PIN/SPI must be
+ set to logic high for SPI Control Mode, low for Pin Control Mode. When
+ absent, implies the SPI interface configuration.
+ enum: [ spi-control-mode, pin-control-mode ]
+ default: spi-control-mode
+
+ adi,asrc-mode:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ Asynchronous Sample Rate Converter (ASRC) operation mode control input.
+ Describes whether the MODE pin is set to a high level (for master mode
+ operation) or to a low level (for slave mode operation).
+ enum: [ high, low ]
+ default: low
+
+ adi,dclkio:
+ description:
+ DCLK pin I/O direction control for when the device operates in Pin Control
+ Slave Mode or in SPI Control Mode. Describes if DEC0/DCLKIO pin is at a
+ high level (which configures DCLK as an output) or to set to a low level
+ (configuring DCLK for input).
+ enum: [ out, in ]
+ default: in
+
+ adi,dclkmode:
+ description:
+ DCLK mode control for when the device operates in Pin Control Slave Mode
+ or in SPI Control Mode. Describes whether the DEC1/DCLKMODE pin is set to
+ a high level (configuring the DCLK to operate in free running mode) or
+ to a low level (to configure DCLK to operate in gated mode).
+ enum: [ free-running, gated ]
+ default: gated
+
+required:
+ - compatible
+ - reg
+ - avdd5-supply
+ - dvdd5-supply
+ - iovdd-supply
+ - refin-supply
+ - clocks
+ - clock-names
+
+allOf:
+ - if:
+ not:
+ required:
+ - ldoin-supply
+ then:
+ required:
+ - avdd1v8-supply
+ - dvdd1v8-supply
+ - clkvdd-supply
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad4134";
+ reg = <0>;
+
+ spi-max-frequency = <1000000>;
+
+ reset-gpios = <&gpio0 86 GPIO_ACTIVE_LOW>;
+ odr-gpios = <&gpio0 87 GPIO_ACTIVE_HIGH>;
+ powerdown-gpios = <&gpio0 88 GPIO_ACTIVE_LOW>;
+
+ clocks = <&sys_clk>;
+ clock-names = "clkin";
+
+ avdd5-supply = <&avdd5>;
+ dvdd5-supply = <&dvdd5>;
+ iovdd-supply = <&iovdd>;
+ refin-supply = <&refin>;
+ avdd1v8-supply = <&avdd1v8>;
+ dvdd1v8-supply = <&dvdd1v8>;
+ clkvdd-supply = <&clkvdd>;
+
+ adi,control-mode = "spi-control-mode";
+ adi,asrc-mode = "low";
+ adi,dclkio = "in";
+ adi,dclkmode = "gated";
+
+ regulators {
+ vcm_reg: vcm-output {
+ regulator-name = "ad4134-vcm";
+ };
+ };
+
+ };
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 9f3413e05c83..56bea005755d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1437,6 +1437,13 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130
F: Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml
F: drivers/iio/adc/ad4130.c

+ANALOG DEVICES INC AD4134 DRIVER
+M: Marcelo Schmitt <marcelo.schmitt@analog.com>
+L: linux-iio@vger.kernel.org
+S: Supported
+W: https://ez.analog.com/linux-software-drivers
+F: Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
+
ANALOG DEVICES INC AD4170-4 DRIVER
M: Marcelo Schmitt <marcelo.schmitt@analog.com>
L: linux-iio@vger.kernel.org
--
2.51.0