Stefan Wahren <wahrenst@xxxxxxx> (2023-12-05): > In contrast to the Raspberry Pi 4, the Compute Module 4 or the IO board > does not have a VL805 USB 3.0 host controller, which is connected via > PCIe. Instead, the Compute Module provides the built-in > xHCI of the BCM2711 SoC. > > Changes in V4: > - use "brcm,xhci-brcm-v2" as fallback compatible as suggested by > Conor & Florian > > Changes in V3: > - introduce a new compatible for BCM2711 in order to make the > power domain dependency SoC specific, which also results in > a driver change This is still: Tested-by: Cyril Brulebois <cyril@xxxxxxxxxxx> Again, I'm also applying Jim Quinlan's PCIe patch series v8, to be able to fully test what happens with USB devices, onboard and behind PCIe: https://lore.kernel.org/all/20231126201946.ffm3bhg5du2xgztv@xxxxxxxx/ With the following on a CM4 IO Board, with a Samsung flash drive and a USB keyboard connected to onboard USB ports: - CM4 Lite Rev 1.0 - CM4 8/32 Rev 1.0 - CM4 4/32 Rev 1.1 and using one of the three PCIe-to-USB boards referenced previously, connecting another Samsung flash drive on one of its USB ports. Conclusion: I can see and use onboard USB devices alongside behind-PCIe USB devices, either with or without adding otg_mode=1 to config.txt. On a CM4-based product that uses both onboard USB ports and PCIe-to-USB ports, all USB components still work fine (3 RF adapters, 1 modem), with or without otg_mode=1. (All of this is still with a Debian 12 arm64 user space.) Cheers, -- Cyril Brulebois (kibi@xxxxxxxxxx) <https://debamax.com/> D-I release manager -- Release team member -- Freelance Consultant
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