dt-bindings: iio: adc: add NCT7201 ADCs

Add a binding specification for the Nuvoton NCT7201/NCT7202 up to 12-bit
ADCs with I2C interface.

Signed-off-by: Eason Yang <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

Author: YHYANG2

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml

@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/nuvoton,nct7201.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton nct7201 and similar ADCs
+
+maintainers:
+  - Eason Yang <[email protected]>
+
+description: |
+  The NCT7201/NCT7202 is a Nuvoton Hardware Monitor IC, contains up to 12
+  voltage monitoring channels, with SMBus interface, and up to 4 sets SMBus
+  address selection by ADDR connection. It also provides ALERT# signal for
+  event notification and reset input RSTIN# to recover it from a fault
+  condition.
+
+  NCT7201 contains 8 voltage monitor inputs (VIN1~VIN8).
+  NCT7202 contains 12 voltage monitor inputs (VIN1~VIN12).
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,nct7201
+      - nuvoton,nct7202
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description:
+      A 3.3V to supply that powers the chip.
+
+  vref-supply:
+    description:
+      The regulator supply for the ADC reference voltage.
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@1d {
+            compatible = "nuvoton,nct7202";
+            reg = <0x1d>;
+            vdd-supply = <&vdd>;
+            vref-supply = <&vref>;
+            interrupt-parent = <&gpio3>;
+            interrupts = <30 IRQ_TYPE_LEVEL_LOW>;
+            reset-gpios = <&gpio3 28 GPIO_ACTIVE_LOW>;
+        };
+    };
+...

MAINTAINERS

@@ -17336,6 +17336,12 @@ F:	drivers/nubus/
 F:	include/linux/nubus.h
 F:	include/uapi/linux/nubus.h
 
+NUVOTON NCT7201 IIO DRIVER
+M:	Eason Yang <[email protected]>
+L:	[email protected]
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml
+
 NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER
 M:	Antonino Daplas <[email protected]>
 L:	[email protected]