feat: enable PWM_RP1 drivers for Raspberry Pi 5 fan control#1500
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blacksd wants to merge 1 commit intosiderolabs:mainfrom
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feat: enable PWM_RP1 drivers for Raspberry Pi 5 fan control#1500blacksd wants to merge 1 commit intosiderolabs:mainfrom
blacksd wants to merge 1 commit intosiderolabs:mainfrom
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Enable CONFIG_PWM_RP1 and CONFIG_PWM_PIO_RP1 in the arm64 kernel config. These in-tree drivers are required for the Raspberry Pi 5 dedicated 4-pin PWM fan header to function. Without them, the cooling_fan device tree node cannot acquire a PWM channel and the fan probe is permanently deferred: platform cooling_fan: deferred probe pending: pwm-fan: Could not get PWM Fixes: siderolabs#1499 Signed-off-by: Marco Bulgarini <marco.bulgarini@gmail.com>
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These config options don't seem to exist in the upstream Linux kernel |
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Summary
CONFIG_PWM_RP1andCONFIG_PWM_PIO_RP1in the arm64 kernel configContext
With the
rpi_5overlay now available in the Image Factory (sbc-raspberrypi v0.2.0), Pi 5 boards can boot Talos natively. However, the dedicated fan header does not work because the RP1 PWM drivers are not enabled in the kernel config.The kernel logs show:
The
cooling_fandevice is defined in the Pi 5 device tree and requires the RP1 PWM driver to acquire a PWM channel. Without it, the fan never spins, leading to thermal throttling under load.PR #1375 previously enabled
CONFIG_SENSORS_GPIO_FANandCONFIG_PWM_GPIOfor GPIO-connected fans (RPi 4), but did not cover the Pi 5's native fan header.Fixes #1499