dt-bindings: iio: adc: add AD7191

AD7191 is a pin-programmable, ultralow 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]>
analogdevicesinc · Dec 19, 2024 · a44063a · a44063a
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diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml
@@ -0,0 +1,128 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2024 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 device driver
+
+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
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7191
+
+  reg:
+    maxItems: 1
+
+  spi-cpol: true
+
+  spi-cpha: true
+
+  clocks:
+    maxItems: 1
+    description:
+      Optionally, either a crystal can be attached externally between MCLK1 and
+      MCLK2 pins, or an external CMOS-compatible clock can drive the MCLK2
+      pin. If absent, internal 4.92MHz clock is used.
+
+  interrupts:
+    maxItems: 1
+
+  avdd-supply:
+    description: AVdd voltage supply
+
+  dvdd-supply:
+    description: DVdd voltage supply
+
+  vref-supply:
+    description: Vref voltage supply
+
+  odr1-gpios:
+    description: GPIO connected to ODR1 pin for output data rate selection
+    maxItems: 1
+
+  odr2-gpios:
+    description: GPIO connected to ODR2 pin for output data rate selection
+    maxItems: 1
+
+  pga1-gpios:
+    description: GPIO connected to PGA1 pin for gain selection
+    maxItems: 1
+
+  pga2-gpios:
+    description: GPIO connected to PGA2 pin for gain selection
+    maxItems: 1
+
+  temp-gpios:
+    description: GPIO connected to TEMP pin for temperature sensor enable
+    maxItems: 1
+
+  chan-gpios:
+    description: GPIO connected to CHAN pin for input channel selection
+    maxItems: 1
+
+  clksel-gpios:
+    description: GPIO connected to CLKSEL pin for clock source selection
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - avdd-supply
+  - dvdd-supply
+  - vref-supply
+  - spi-cpol
+  - spi-cpha
+  - odr1-gpios
+  - odr2-gpios
+  - pga1-gpios
+  - pga2-gpios
+  - temp-gpios
+  - chan-gpios
+  - clksel-gpios
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi0 {
+        #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>;
+            odr1-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
+            odr2-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
+            pga1-gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
+            pga2-gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+            temp-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
+            chan-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+            clksel-gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
@@ -1258,6 +1258,13 @@ F:	Documentation/iio/ad4695.rst
 F:	drivers/iio/adc/ad4695.c
 F:	include/dt-bindings/iio/adi,ad4695.h
 
+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:	Alexandru Tachici <[email protected]>
 L:	[email protected]