dt-bindings: iio: adc: add AD7191

AD7191 is a pin-programmable, ultra-low noise 24-bit sigma-delta ADC
designed for precision bridge sensor measurements. It features two
differential analog input channels, selectable output rates,
programmable gain, internal temperature sensor and simultaneous
50Hz/60Hz rejection.

Signed-off-by: Alisa-Dariana Roman <[email protected]>
Reviewed-by: Rob Herring (Arm) <[email protected]>
Reviewed-by: David Lechner<[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

Author: darianaroman

Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml

@@ -0,0 +1,149 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2025 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7191.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7191 ADC
+
+maintainers:
+  - Alisa-Dariana Roman <[email protected]>
+
+description: |
+  Bindings for the Analog Devices AD7191 ADC device. Datasheet can be
+  found here:
+  https://www.analog.com/media/en/technical-documentation/data-sheets/AD7191.pdf
+  The device's PDOWN pin must be connected to the SPI controller's chip select
+  pin.
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7191
+
+  reg:
+    maxItems: 1
+
+  spi-cpol: true
+
+  spi-cpha: true
+
+  clocks:
+    maxItems: 1
+    description:
+      Must be present when CLKSEL pin is tied HIGH to select external clock
+      source (either a crystal between MCLK1 and MCLK2 pins, or a
+      CMOS-compatible clock driving MCLK2 pin). Must be absent when CLKSEL pin
+      is tied LOW to use the internal 4.92MHz clock.
+
+  interrupts:
+    maxItems: 1
+
+  avdd-supply:
+    description: AVdd voltage supply
+
+  dvdd-supply:
+    description: DVdd voltage supply
+
+  vref-supply:
+    description: Vref voltage supply
+
+  odr-gpios:
+    description:
+      ODR1 and ODR2 pins for output data rate selection. Should be defined if
+      adi,odr-value is absent.
+    minItems: 2
+    maxItems: 2
+
+  adi,odr-value:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Should be present if ODR pins are pin-strapped. Possible values:
+      120 Hz (ODR1=0, ODR2=0)
+      60 Hz (ODR1=0, ODR2=1)
+      50 Hz (ODR1=1, ODR2=0)
+      10 Hz (ODR1=1, ODR2=1)
+      If defined, odr-gpios must be absent.
+    enum: [120, 60, 50, 10]
+
+  pga-gpios:
+    description:
+      PGA1 and PGA2 pins for gain selection. Should be defined if adi,pga-value
+      is absent.
+    minItems: 2
+    maxItems: 2
+
+  adi,pga-value:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Should be present if PGA pins are pin-strapped. Possible values:
+      Gain 1 (PGA1=0, PGA2=0)
+      Gain 8 (PGA1=0, PGA2=1)
+      Gain 64 (PGA1=1, PGA2=0)
+      Gain 128 (PGA1=1, PGA2=1)
+      If defined, pga-gpios must be absent.
+    enum: [1, 8, 64, 128]
+
+  temp-gpios:
+    description: TEMP pin for temperature sensor enable.
+    maxItems: 1
+
+  chan-gpios:
+    description: CHAN pin for input channel selection.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - avdd-supply
+  - dvdd-supply
+  - vref-supply
+  - spi-cpol
+  - spi-cpha
+  - temp-gpios
+  - chan-gpios
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - oneOf:
+      - required:
+          - adi,odr-value
+      - required:
+          - odr-gpios
+  - oneOf:
+      - required:
+          - adi,pga-value
+      - required:
+          - pga-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad7191";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            spi-cpol;
+            spi-cpha;
+            clocks = <&ad7191_mclk>;
+            interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+            interrupt-parent = <&gpio>;
+            avdd-supply = <&avdd>;
+            dvdd-supply = <&dvdd>;
+            vref-supply = <&vref>;
+            adi,pga-value = <1>;
+            odr-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>, <&gpio 24 GPIO_ACTIVE_HIGH>;
+            temp-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
+            chan-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+        };
+    };

MAINTAINERS

@@ -1346,6 +1346,13 @@ W:	http://ez.analog.com/community/linux-device-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad7091r*
 F:	drivers/iio/adc/ad7091r*
 
+ANALOG DEVICES INC AD7191 DRIVER
+M:	Alisa-Dariana Roman <[email protected]>
+L:	[email protected]
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml
+
 ANALOG DEVICES INC AD7192 DRIVER
 M:	Alisa-Dariana Roman <[email protected]>
 L:	[email protected]