# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/hwmon/zyxel,nsa320-mcu.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ZyXEL NSA320 MCU

maintainers:
  - Adam Baker <linux@baker-net.org.uk>
  - Guenter Roeck <linux@roeck-us.net>

description:
  The ZyXEL NSA320 uses a dedicated microcontroller to manage system-critical
  functions like fan speed and power monitoring. It is connected to the SoC
  via a GPIO-based serial protocol.

properties:
  compatible:
    const: zyxel,nsa320-mcu

  data-gpios:
    maxItems: 1
    description: GPIO pin connected to the data line on the MCU.

  clk-gpios:
    maxItems: 1
    description: GPIO pin connected to the clock line on the MCU.

  act-gpios:
    maxItems: 1
    description: GPIO pin connected to the active line on the MCU.

required:
  - compatible
  - data-gpios
  - clk-gpios
  - act-gpios

additionalProperties: false

examples:
  - |
    #include <dt-bindings/gpio/gpio.h>

    hwmon {
        compatible = "zyxel,nsa320-mcu";
        pinctrl-0 = <&pmx_mcu_data &pmx_mcu_clk &pmx_mcu_act>;
        pinctrl-names = "default";

        data-gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
        clk-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
        act-gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
    };