[PATCH 0/3] ARM: dts: bcm2711-rpi-cm4-io: Enable xHCI host

[Stefan Wahren]

Hi Justin,

[add Phil]

Am 27.11.23 um 07:02 schrieb Justin Chen:
>
>
> On 11/25/23 6:56 PM, Stefan Wahren wrote:
>> 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 BCM2711 on the Compute Module provides the built-in
>> xHCI.
>>
>
> Does this work? I maintain this built-in xHCI controller internally. I
> wasn't aware the Compute Module uses this block.
i successful tested this with a CM4 (arm 32 bit,
multi_v7_lpae_defconfig) with eMMC. Before this series the USB devices
(mouse, keyboard) connected to the host interface didn't work. After
comparing vendor DTS with mainline i noticed the missing xHCI block [1].
Unfortunately i wasn't able to get further information from the public
datasheets. I don't know if the VideoCore does some magic tricks on the
xHCI or i missed some downstream xHCI changes.

> This block is held in reset and needs a bit toggled to get things
> going. Florian, just to confirm, this is our "brcm,xhci-brcm-v2" block
> correct?
>
> Justin

[1]  -
https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/bcm2711-rpi-ds.dtsi#L119