[PATCH v7 0/3] Add RP1 PWM controller support

Florian Fainelli florian.fainelli at broadcom.com
Thu Sep 3 13:11:41 PDT 2026


On 7/20/26 02:44, Andrea della Porta wrote:
> This patchset adds support for the PWM controller found on the
> Raspberry Pi RP1 southbridge. This is necessary to operate the
> cooling fan connected to one of the PWM channels.
> 
> The tachometer pin for the fan speed is managed by the firmware
> running on the RP1's M-core. It uses the PHASE2 register
> to report the RPM, which is then exported by this driver via
> syscon registers. A subsequent patch will add a new device
> and driver to read the RPM and export this value via hwmon.
>   
> Subsequent patches will also add the CPU thermal zone, which
> acts as a consumer of the PWM device.
> 
> Best regards,
> Andrea

Uwe, how do we go about applying these patches? Do you want to take 
patch #2 and I take patches #1 and #3 through the Broadcom ARM SoC tree(s)?
-- 
Florian



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