[GSoC 2024] Add support for AD7294

Documentation/devicetree/bindings/iio/addac/adi,ad7294.yaml

@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/addac/adi,ad7294.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Device AD7294/AD7294-2 device
+
+maintainers:
+  - Anshul Dalal <[email protected]>
+
+description: |
+  The AD7294/AD7294-2 is a monitor and control system with multichannel
+  ADC, DAC, temperature and current sensor. The device features a 12-bit ADC
+  and DAC with an i2c interface.
+
+  Datasheet:
+    AD7294: https://www.analog.com/media/en/technical-documentation/data-sheets/AD7294.pdf
+    AD7294-2: https://www.analog.com/media/en/technical-documentation/data-sheets/AD7294-2.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7294
+      - adi,ad7294-2
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+    description: Alert interrupt
+
+  adc-vref-supply:
+    description: The regulator supply for ADC reference voltage (0.1V to 4.1V).
+
+  dac-vref-supply:
+    description: |
+      The regulator supply for DAC reference voltage (0V to AVDD - 2V).
+
+  avdd-supply:
+    description: Fixed regulator supply for analog circuitry (4.5V to 5.5V).
+
+  vdrive-supply:
+    description: Logic power supply (2.7V to 5.5V).
+
+  shunt-resistor-ohms:
+    $ref: /schemas/types.yaml#/definitions/int32-array
+    maxItems: 2
+    description: Resistance for RS1 and RS2 in ohms
+
+required:
+  - compatible
+  - reg
+  - avdd-supply
+  - vdrive-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ad7294: addac@7b {
+        compatible = "adi,ad7294";
+        reg = <0x7b>;
+        interrupt-parent = <&gpio>;
+        interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
+        adc-vref-supply = <&adc_vref>;
+        dac-vref-supply = <&dac_vref>;
+        avdd-supply = <&avdd>;
+        vdrive-supply = <&vdrive>;
+        shunt-resistor-ohms = <1000 1000>;
+      };
+    };

arch/arm/boot/dts/overlays/Makefile

@@ -225,6 +225,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	rpi-ad7173.dtbo \
 	rpi-ad7190.dtbo \
 	rpi-ad7293.dtbo \
+	rpi-ad7294.dtbo \
 	rpi-ad738x.dtbo \
 	rpi-ad7746.dtbo \
 	rpi-ad7768-1.dtbo \

arch/arm/boot/dts/overlays/rpi-ad7294-overlay.dts

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target-path = "/";
+		__overlay__ {
+			avdd: fixedregulator@0 {
+				compatible = "regulator-fixed";
+				regulator-name = "avdd";
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5000000>;
+				regulator-boot-on;
+			};
+			vdrive: fixedregulator@1 {
+				compatible = "regulator-fixed";
+				regulator-name = "vdrive";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-boot-on;
+			};
+			adc_vref: fixedregulator@2 {
+				compatible = "regulator-fixed";
+				regulator-name = "adc-vref";
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <2500000>;
+				regulator-boot-on;
+			};
+			dac_vref: fixedregulator@3 {
+				compatible = "regulator-fixed";
+				regulator-name = "dac-vref";
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <2500000>;
+				regulator-boot-on;
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&i2c_arm>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			ad7294: ad7294@62 {
+				compatible = "adi,ad7294-2";
+				reg = <0x62>;
+				interrupts = <4 IRQ_TYPE_EDGE_FALLING>;
+				interrupt-parent = <&gpio>;
+				shunt-resistor-ohms = <1000 1000>;
+				adc-vref-supply = <&adc_vref>;
+				dac-vref-supply = <&dac_vref>;
+				avdd-supply = <&avdd>;
+				vdrive-supply = <&vdrive>;
+			};
+		};
+	};
+};

drivers/iio/addac/Kconfig

@@ -19,6 +19,16 @@ config AD74115
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad74115.
 
+config AD7294
+	tristate "Analog Devices AD7294 driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say yes here to build support for Analog Devices AD7294/AD7294-2.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad7294.
+
 config AD74413R
 	tristate "Analog Devices AD74412R/AD74413R driver"
 	depends on GPIOLIB && SPI

drivers/iio/addac/Makefile

@@ -4,6 +4,7 @@
 #
 
 # When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_AD7294) += ad7294.o
 obj-$(CONFIG_AD74115) += ad74115.o
 obj-$(CONFIG_AD74413R) += ad74413r.o
 obj-$(CONFIG_STX104) += stx104.o