tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
dt-bindings: pwm: Add binding for RPi firmware PWM bus
The PWM bus controlling the fan in RPi's official PoE hat can only be
controlled by the board's co-processor.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Rob Herring <robh@kernel.org>
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Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
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Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
···
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- compatible
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- "#reset-cells"
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pwm:
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type: object
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properties:
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compatible:
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const: raspberrypi,firmware-poe-pwm
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"#pwm-cells":
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# See pwm.yaml in this directory for a description of the cells format.
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const: 2
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required:
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- compatible
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- "#pwm-cells"
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additionalProperties: false
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required:
···
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reset: reset {
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compatible = "raspberrypi,firmware-reset";
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#reset-cells = <1>;
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};
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pwm: pwm {
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compatible = "raspberrypi,firmware-poe-pwm";
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#pwm-cells = <2>;
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};
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};
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...
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include/dt-bindings/pwm/raspberrypi,firmware-poe-pwm.h
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include/dt-bindings/pwm/raspberrypi,firmware-poe-pwm.h
···
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2020 Nicolas Saenz Julienne
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* Author: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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*/
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#ifndef _DT_BINDINGS_RASPBERRYPI_FIRMWARE_PWM_H
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#define _DT_BINDINGS_RASPBERRYPI_FIRMWARE_PWM_H
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#define RASPBERRYPI_FIRMWARE_PWM_POE 0
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#define RASPBERRYPI_FIRMWARE_PWM_NUM 1
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#endif