These MCUs can be found in network attached storage devices made by QNAP. They are connected to a serial port of the host device and provide functionality like LEDs, power-control and temperature monitoring. LEDs, buttons, etc are all elements of the MCU firmware itself, so don't need devicetree input, though the fan gets its cooling settings from a fan-0 subnode. A binding for the LEDs for setting the linux-default-trigger may come later, once all the LEDs are understood and ATA controllers actually can address individual port-LEDs, but are really optional. Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> --- .../bindings/mfd/qnap,ts433-mcu.yaml | 42 +++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml diff --git a/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml new file mode 100644 index 0000000000000..877078ac172f1 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml @@ -0,0 +1,42 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/qnap,ts433-mcu.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: QNAP NAS on-board Microcontroller + +maintainers: + - Heiko Stuebner <heiko@xxxxxxxxx> + +description: + QNAP embeds a microcontroller on their NAS devices adding system feature + as PWM Fan control, additional LEDs, power button status and more. + +properties: + compatible: + enum: + - qnap,ts433-mcu + +patternProperties: + "^fan-[0-9]+$": + $ref: /schemas/hwmon/fan-common.yaml# + unevaluatedProperties: false + +required: + - compatible + +additionalProperties: false + +examples: + - | + uart { + mcu { + compatible = "qnap,ts433-mcu"; + + fan-0 { + #cooling-cells = <2>; + cooling-levels = <0 64 89 128 166 204 221 238>; + }; + }; + }; -- 2.39.2
