Add maxim max34408/34409 ADC driver and yaml

new file mode 100644
index 000000000000..4262bedb4bfa
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/maxim,max34408.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Two- and four-channel current monitors with overcurrent control
+
+maintainers:
+  - Ivan Mikhaylov <[email protected]>
+
+description: |
+  The MAX34408/MAX34409 are two- and four-channel current monitors that are
+  configured and monitored with a standard I2C/SMBus serial interface. Each
+  unidirectional current sensor offers precision high-side operation with a
+  low full-scale sense voltage. The devices automatically sequence through
+  two or four channels and collect the current-sense samples and average them
+  to reduce the effect of impulse noise. The raw ADC samples are compared to
+  user-programmable digital thresholds to indicate overcurrent conditions.
+  Overcurrent conditions trigger a hardware output to provide an immediate
+  indication to shut down any necessary external circuitry.
+
+  Specifications about the devices can be found at:
+  https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf
+
+properties:
+  compatible:
+    enum:
+      - maxim,max34408
+      - maxim,max34409
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  isshutdown-gpios:
+    description:
+      Shutdown Output. Open-drain output. This output transitions to high impedance
+      when any of the digital comparator thresholds are exceeded as long as the ENA
+      pin is high.
+    maxItems: 1
+
+  shtdn-enable-gpios:
+    description:
+      SHTDN Enable Input. CMOS digital input. Connect to GND to clear the latch and
+      unconditionally deassert (force low) the SHTDN output and reset the shutdown
+      delay. Connect to VDD to enable normal latch operation of the SHTDN output.
+    maxItems: 1
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - reg
+
+patternProperties:
+  "^channel@[0-3]$":
+    $ref: adc.yaml
+    type: object
+    description:
+      Represents the internal channels of the ADC.
+
+    properties:
+      reg:
+        items:
+          minimum: 0
+          maximum: 3
+
+      maxim,rsense-val-micro-ohms:
+        description:
+          Adjust the Rsense value to monitor higher or lower current levels for
+          input.
+        enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000]
+        default: 1000
+
+    required:
+      - reg
+      - maxim,rsense-val-micro-ohms
+
+    unevaluatedProperties: false
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: maxim,max34408
+    then:
+      patternProperties:
+        "^channel@[2-3]$": false
+        "^channel@[0-1]$":
+          properties:
+            reg:
+              minimum: 0
+              maximum: 1
+    else:
+      patternProperties:
+        "^channel@[0-3]$":
+          properties:
+            reg:
+              minimum: 0
+              maximum: 3
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@1e {
+              compatible = "maxim,max34409";
+              reg = <0x1e>;
+
+              #address-cells = <1>;
+              #size-cells = <0>;
+              channel@0 {
+                  reg = <0x0>;
+                  maxim,rsense-val-micro-ohms = <5000>;
+              };
+
+              channel@1 {
+                  reg = <0x1>;
+                  maxim,rsense-val-micro-ohms = <10000>;
+             };
+        };
+    };

index 517b3db114b8..c215a2861350 100644
@@ -735,6 +735,17 @@ config MAX1363
 	  To compile this driver as a module, choose M here: the module will be
 	  called max1363.
 
+config MAX34408
+	tristate "Maxim max34408/max344089 ADC driver"
+	depends on I2C
+	help
+	  Say yes here to build support for Maxim max34408/max34409 current sense
+	  monitor with 8-bits ADC interface with overcurrent delay/threshold and
+	  shutdown delay.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called max34408.
+
 config MAX77541_ADC
 	tristate "Analog Devices MAX77541 ADC driver"
 	depends on MFD_MAX77541

index 2facf979327d..46dceab85e9a 100644
@@ -67,6 +67,7 @@ obj-$(CONFIG_MAX11205) += max11205.o
 obj-$(CONFIG_MAX11410) += max11410.o
 obj-$(CONFIG_MAX1241) += max1241.o
 obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_MAX34408) += max34408.o
 obj-$(CONFIG_MAX77541_ADC) += max77541-adc.o
 obj-$(CONFIG_MAX9611) += max9611.o
 obj-$(CONFIG_MCP320X) += mcp320x.o