Mainline support for RP1_PWM / Pi 5 Cooling Fan
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 42/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- c, linux
- Domain
- embedded-iot, operating-systems
Research direction
Start by inspecting the mainline kernel for the missing pwm-rp1.c source and the Raspberry Pi 5 device-tree entries mentioned in the issue. Compare those areas with existing RP1 support, then verify that the cooling fan operates on a 6.18 or later mainline kernel.
Written by the indexing model from the issue text.
Description
Describe the bug
A few weeks ago, it came to my attention (here) that, although there is now mainline support for parts of the RP1 chip; some of the functionality is missing.
Specifically, the support for the PWM functions, which drive the cooling fan.
Steps to reproduce the behaviour
Either inspect the mainline kernel for the missing "pwm-rp1.c" source, and missing entries in the device trees.
Or, try the mainline kernel (6.18 or later), and observe no cooling fan operation.
Device (s)
Raspberry Pi 5
System
OS Version: Debian Forky / Testing / 14
Kernel Version: Linux rpi5-20260109 6.18.3+deb14-arm64 #1 SMP PREEMPT Debian 6.18.3-1 (2026-01-02) aarch64 GNU/Linux
Logs
No response
Additional context
No response
- Dominant language
- C
- Stars
- 13.2k
- Forks
- 5.5k
- Avg merge
- 2d 21h
- Merged PRs (30d)
- 21
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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