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2021-03-22dt-bindings: pwm: Add binding for RPi firmware PWM busNicolas Saenz Julienne1-0/+13
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>