[PATCH 1/6] dt-bindings: iio: adc: Add AD7768

From: Janani Sunil

Date: Thu Jul 09 2026 - 04:53:11 EST

Devicetree Bindings for AD7768-4 (4 channel) and AD7768 (8 channel)
simultaneous sampling ADC

Signed-off-by: Janani Sunil <janani.sunil@xxxxxxxxxx>
---
.../devicetree/bindings/iio/adc/adi,ad7768.yaml | 285 +++++++++++++++++++++
MAINTAINERS | 7 +
2 files changed, 292 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml
new file mode 100644
index 000000000000..b74fe6aef01c
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml
@@ -0,0 +1,285 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7768.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7768 and AD7768-4 ADC
+
+maintainers:
+ - Janani Sunil <janani.sunil@xxxxxxxxxx>
+
+description: |
+ The AD7768 is a 8-channel, 24-bit simultaneous sampling ADC with configurable
+ power and performance modes. The AD7768-4 is a 4-channel version.
+
+ Datasheet at:
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768.pdf
+
+properties:
+ compatible:
+ enum:
+ - adi,ad7768
+ - adi,ad7768-4
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+ description: Master clock (MCLK)
+
+ avdd-supply:
+ description: Analog power supply AVDD1 (4.5V to 5.5V)
+
+ avss-supply:
+ description: Analog ground/negative supply AVSS (0V to -2.75V)
+
+ dvdd-supply:
+ description: Analog power supply AVDD2 (2.0V to 5.5V)
+
+ iovdd-supply:
+ description: Digital I/O power supply (1.8V or 2.25V to 3.6V)
+
+ vref-supply:
+ description: ADC reference voltage supply
+
+ reset-gpios:
+ maxItems: 1
+ description: GPIO connected to the active-low RESET pin
+
+ gpio-controller: true
+
+ '#gpio-cells':
+ const: 2
+
+ adi,data-lines-number:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [1, 2, 4, 8]
+ description:
+ Number of data output lines used for serial interface.
+ AD7768 supports 1, 2, or 8 lines. AD7768-4 supports 1 or 4 lines.
+
+ adi,common-mode-output:
+ $ref: /schemas/types.yaml#/definitions/string
+ enum:
+ - avdd-avss-half
+ - 1.65V
+ - 2.5V
+ - 2.14V
+ description:
+ Common mode voltage output selection.
+
+ adi,vcm-power-down:
+ type: boolean
+ description: Power down the common mode output buffer
+
+ adi,power-mode:
+ $ref: /schemas/types.yaml#/definitions/string
+ enum:
+ - low
+ - median
+ - fast
+ description:
+ Power mode selection.
+
+ io-backends:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+patternProperties:
+ "^channel@[0-7]$":
+ type: object
+ description: |
+ Represents the external channels which are connected to the device.
+ AD7768 supports channels 0-7, AD7768-4 supports channels 0-3.
+
+ properties:
+ reg:
+ minimum: 0
+ maximum: 7
+ description: The channel number
+
+ adi,ch-mode:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 1
+ description: |
+ Channel mode selection. The AD7768 supports two independent
+ configuration profiles (Mode A and Mode B) for filter and
+ decimation settings. Each channel can be assigned to either mode:
+ 0 - Channel uses Mode A filter and decimation settings
+ 1 - Channel uses Mode B filter and decimation settings
+
+ adi,prebuf-pos-en:
+ type: boolean
+ description: Enable positive input precharge buffer
+
+ adi,prebuf-neg-en:
+ type: boolean
+ description: Enable negative input precharge buffer
+
+ adi,refbuf-pos-en:
+ type: boolean
+ description: Enable positive reference buffer
+
+ adi,refbuf-neg-en:
+ type: boolean
+ description: Enable negative reference buffer
+
+ required:
+ - reg
+ - adi,ch-mode
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - avdd-supply
+ - avss-supply
+ - dvdd-supply
+ - iovdd-supply
+ - vref-supply
+ - adi,data-lines-number
+ - adi,common-mode-output
+ - io-backends
+
+dependencies:
+ gpio-controller:
+ - '#gpio-cells'
+ '#gpio-cells':
+ - gpio-controller
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: adi,ad7768-4
+ then:
+ properties:
+ adi,data-lines-number:
+ enum: [1, 4]
+ patternProperties:
+ "^channel@[0-3]$":
+ properties:
+ reg:
+ maximum: 3
+ "^channel@[4-7]$": false
+ else:
+ properties:
+ adi,data-lines-number:
+ enum: [1, 2, 8]
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad7768";
+ reg = <0>;
+ spi-max-frequency = <1000000>;
+
+ avdd-supply = <&avdd_regulator>;
+ avss-supply = <&avss_regulator>;
+ dvdd-supply = <&dvdd_regulator>;
+ iovdd-supply = <&iovdd_regulator>;
+ vref-supply = <&vref_regulator>;
+ reset-gpios = <&gpio0 86 GPIO_ACTIVE_LOW>;
+
+ clocks = <&ad7768_mclk>;
+
+ adi,data-lines-number = <8>;
+ adi,common-mode-output = "2.5V";
+ adi,vcm-power-down;
+ adi,power-mode = "median";
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ io-backends = <&iio_backend>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ adi,ch-mode = <0>;
+ adi,prebuf-pos-en;
+ adi,refbuf-pos-en;
+ };
+
+ channel@1 {
+ reg = <1>;
+ adi,ch-mode = <1>;
+ adi,prebuf-pos-en;
+ adi,prebuf-neg-en;
+ adi,refbuf-pos-en;
+ adi,refbuf-neg-en;
+ };
+
+ channel@7 {
+ reg = <7>;
+ adi,ch-mode = <1>;
+ adi,prebuf-pos-en;
+ adi,refbuf-pos-en;
+ };
+ };
+ };
+
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@1 {
+ compatible = "adi,ad7768-4";
+ reg = <1>;
+ spi-max-frequency = <1000000>;
+
+ avdd-supply = <&avdd_regulator>;
+ avss-supply = <&avss_regulator>;
+ dvdd-supply = <&dvdd_regulator>;
+ iovdd-supply = <&iovdd_regulator>;
+ vref-supply = <&vref_regulator>;
+
+ clocks = <&ad7768_mclk>;
+
+ adi,data-lines-number = <4>;
+ adi,common-mode-output = "2.14V";
+ adi,power-mode = "fast";
+
+ io-backends = <&iio_backend>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ adi,ch-mode = <0>;
+ adi,prebuf-pos-en;
+ adi,refbuf-pos-en;
+ };
+
+ channel@3 {
+ reg = <3>;
+ adi,ch-mode = <1>;
+ adi,prebuf-pos-en;
+ adi,refbuf-pos-en;
+ };
+ };
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 2b1ec46c5919..d667a0411f28 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1633,6 +1633,13 @@ F: Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
F: drivers/iio/adc/ad7768-1.c
F: include/dt-bindings/iio/adc/adi,ad7768-1.h

+ANALOG DEVICES INC AD7768 DRIVER
+M: Janani Sunil <janani.sunil@xxxxxxxxxx>
+L: linux-iio@xxxxxxxxxxxxxxx
+S: Supported
+W: https://ez.analog.com/linux-software-drivers
+F: Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml
+
ANALOG DEVICES INC AD7780 DRIVER
M: Michael Hennerich <Michael.Hennerich@xxxxxxxxxx>
M: Renato Lui Geh <renatogeh@xxxxxxxxx>

--
2.43.0