iio: adc: Add initial driver support for MAX14001/MAX14002

Documentation/devicetree/bindings/iio/adc/adi,max14001.yaml

@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2025 Marilene Andrade Garcia
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,max14001.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX14001-MAX14002 10-bit ADCs
+
+maintainers:
+  - Marilene Andrade Garcia <[email protected]>
+
+description:
+  Bindings for the Analog Devices MAX14001-MAX14002 Configurable,
+  Isolated 10-bit ADCs for Multi-Range Binary Inputs.
+
+  Datasheet can be found here
+    https://www.analog.com/media/en/technical-documentation/data-sheets/MAX14001-MAX14002.pdf
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - adi,max14001
+      - adi,max14002
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description:
+      Isolated DC-DC power supply input voltage.
+
+  vddl-supply:
+    description:
+      Logic power supply.
+
+  vrefin-supply:
+    description:
+      ADC voltage reference supply.
+
+  interrupts:
+    items:
+      - description: |
+          Interrupt for signaling when conversion results exceed the configured
+          upper threshold for ADC readings or fall below the lower threshold for
+          them. Interrupt source must be attached to COUT pin.
+      - description: |
+          Alert output that asserts low during a number of different error
+          conditions. The interrupt source must be attached to FAULT pin.
+
+  spi-max-frequency:
+    maximum: 5000000
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - vddl-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      max14001: adc@0 {
+        compatible = "adi,max14001";
+        reg = <0>;
+        spi-max-frequency = <5000000>;
+        vdd-supply = <&vdd>;
+        vddl-supply = <&vddl>;
+      };
+    };
+...

MAINTAINERS

@@ -13122,6 +13122,14 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/adc/maxim,max11205.yaml
 F:	drivers/iio/adc/max11205.c
 
+MAXIM MAX14001/MAX14002 DRIVER
+M:	Marilene Andrade Garcia <[email protected]>
+L:	[email protected]
+S:	Maintained
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/adc/adi,max14001.yaml
+F:	drivers/iio/adc/max14001.c
+
 MAXIM MAX17040 FAMILY FUEL GAUGE DRIVERS
 R:	Iskren Chernev <[email protected]>
 R:	Krzysztof Kozlowski <[email protected]>

arch/arm/boot/dts/overlays/Makefile

@@ -309,6 +309,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	rpi-ltc2991.dtbo \
 	rpi-ltc4162.dtbo \
 	rpi-ltc6952.dtbo \
+	rpi-max14001-pmb.dtbo \
 	rpi-max14830-i2c.dtbo \
 	rpi-max14830-spi.dtbo \
 	rpi-max31335.dtbo \

arch/arm/boot/dts/overlays/rpi-max14001-pmb-overlay.dts

@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Overlay for the MAX14001 ADC
+ *
+ * Copyright (c) 2025 Marilene Andrade Garcia <[email protected]>
+ *
+ * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX14001-MAX14002.pdf
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2712";
+};
+
+&{/} {
+	vdd: fixedregulator@0 {
+		compatible = "regulator-fixed";
+		regulator-name = "Isolated DC-DC Power Supply Input Voltage";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+		status = "okay";
+	};
+
+	vddl: fixedregulator@1 {
+		compatible = "regulator-fixed";
+		regulator-name = "Logic Power Supply Voltage";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+		status = "okay";
+	};
+
+	vrefin: fixedregulator@2 {
+		compatible = "regulator-fixed";
+		regulator-name = "Reference Input Range Voltage";
+		regulator-min-microvolt = <1250000>;
+		regulator-max-microvolt = <1250000>;
+		regulator-boot-on;
+		regulator-always-on;
+		status = "okay";
+	};
+};
+
+&spi0 {
+    status = "okay";
+	max14001_u51: max14001@0 {
+		compatible = "adi,max14001";
+		reg = <0x0>;
+		spi-max-frequency = <5000000>;
+		vdd-supply = <&vdd>;
+		vddl-supply = <&vddl>;
+		vrefin-supply = <&vrefin>;
+		status = "okay";
+	};
+	max14001_u11: max14001@1 {
+		compatible = "adi,max14001";
+		reg = <0x1>;
+		spi-max-frequency = <5000000>;
+		vdd-supply = <&vdd>;
+		vddl-supply = <&vddl>;
+		vrefin-supply = <&vrefin>;
+		status = "okay";
+	};
+};
+
+&spidev0 {
+	status = "disabled";
+};
+
+&spidev1 {
+	status = "disabled";
+};

drivers/iio/adc/Kconfig

@@ -1126,6 +1126,16 @@ config MAX1363
 	  To compile this driver as a module, choose M here: the module will be
 	  called max1363.
 
+config MAX14001
+	tristate "Analog Devices MAX14001/MAX14002 ADCs driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices MAX14001/MAX14002
+	  Configurable, Isolated 10-bit ADCs for Multi-Range Binary Inputs.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called max14001.
+
 config MAX77541_ADC
 	tristate "Analog Devices MAX77541 ADC driver"
 	depends on MFD_MAX77541

drivers/iio/adc/Makefile

@@ -156,6 +156,7 @@ obj-$(CONFIG_MAX11205) += max11205.o
 obj-$(CONFIG_MAX11410) += max11410.o
 obj-$(CONFIG_MAX1241) += max1241.o
 obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_MAX14001) += max14001.o
 obj-$(CONFIG_MAX77541_ADC) += max77541-adc.o
 obj-$(CONFIG_MAX9611) += max9611.o
 obj-$(CONFIG_MCP320X) += mcp320x.o