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. Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> --- .../devicetree/bindings/mfd/qnap,mcu.yaml | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/qnap,mcu.yaml diff --git a/Documentation/devicetree/bindings/mfd/qnap,mcu.yaml b/Documentation/devicetree/bindings/mfd/qnap,mcu.yaml new file mode 100644 index 0000000000000..3b1ad8cb54da3 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/qnap,mcu.yaml @@ -0,0 +1,43 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/qnap,mcu.yaml# +$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 + + "#cooling-cells": + const: 2 + + cooling-levels: + description: PWM duty cycle values corresponding to thermal cooling states. + $ref: /schemas/types.yaml#/definitions/uint32-array + items: + maximum: 255 + +required: + - compatible + +additionalProperties: false + +examples: + - | + uart { + mcu { + compatible = "qnap,ts433-mcu"; + #cooling-cells = <2>; + cooling-levels = <0 64 89 128 166 204 221 238>; + }; + }; -- 2.39.2
