Re: [PATCH v2] arm64: dts: qcom: qcs6490-rb3gen2: Enable uPD720201 and GL3590

[Dmitry Baryshkov]

On Mon, Mar 23, 2026 at 09:32:39PM -0500, Bjorn Andersson wrote:
> The QCS6490 Rb3Gen2 has a Renesas μPD720201 XHCI controller hanging off
> the TC9563 PCIe switch, on this a Genesys Logic GL3590 USB hub provides
> two USB Type-A ports and an ASIX AX88179 USB 3.0 Gigabit Ethernet
> interface.
> 
> The Renesas chip is powered by two regulators controlled through PM7250B
> GPIOs 1 and 4, and the power/reset pin is pulled down by PM8350C GPIO 4.
> The Genesys chip power is always-on, but the reset pin is controlled
> through TLMM GPIO 162.
> 
> Describe the Renesas chip on the PCIe bus, with supplies and reset, to
> allow it to be brought out of reset and discovered. Then describe the
> two peers of the USB hub, with its reset GPIO, to allow this to be
> brought out of reset.
> 
> The USB Type-A connectors are not described, as they are in no regard
> controlled by the operating system.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxxxx>
> ---
> Dependencies has now landed, so this provides USB Type-A and Ethernet
> support (when renesas_usb_fw.mem) is present.

Note, I initially applied the patch to the bit old -next (20260317) and
I ended up with no PCIe host at all (bare -next would still show the
PCIe host and the TC9563 bridge).


ANyway, does this actually work for you? The hub is detected, but the
USB bus is empty. I tried plugging in several devices (includin the
powered USB hub) and they were completely ignored by the hub.

FWIW I tried both the the pcie_aspm=off and w/o it.

> Missing from the RFC/v1 description was the mentioning that unless I
> pass "pcie_aspm=off" to the kernel, the Renesas controller fails with:
> 
>   xhci-pci-renesas 0001:04:00.0: Abort failed to stop command ring: -110

Interesting, it "worked" in my case, having everythign built in into the
kernel.

> ---
> Changes in v2:
> - Waited for dependencies to land.
> - Dropped "RFC".
> - Link to v1: https://lore.kernel.org/r/20260212-rb3gen2-upd-gl3590-v1-1-18fb04bb32b0@xxxxxxxxxxxxxxxx
> ---
>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 93 ++++++++++++++++++++++++++++
>  1 file changed, 93 insertions(+)
> 

-- 
With best wishes
Dmitry