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

[Dmitry Baryshkov]

On Wed, Mar 25, 2026 at 09:40:58PM -0500, Bjorn Andersson wrote:
> On Wed, Mar 25, 2026 at 01:35:46AM +0200, Dmitry Baryshkov wrote:
> > 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).
> > 
> 
> Applied the patch to next-20260323 and tested again.
> 
> > 
> > ANyway, does this actually work for you?
> 
> Yes, I booted with pcie_aspm=off I have functional ethernet and I can
> plug/unplug a USB storage device and access the content on this.
> 
> > The hub is detected, but the USB bus is empty.
> 
> I've disconnected the USB stick again, so here's the output when only
> ethernet is present.
> 
> /:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci-pci-renesas/4p, 480M
>     |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 480M
> /:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci-pci-renesas/4p, 5000M
>     |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 5000M
>         |__ Port 001: Dev 003, If 0, Class=Vendor Specific Class, Driver=ax88179_178a, 5000M
> 
> > I tried plugging in several devices (includin the
> > powered USB hub) and they were completely ignored by the hub.
> > 
> 
> The USB stick above was powered by the device, so that part is tested as
> well. (And schematics shows VBUS is always present on the Type-A ports).
> 

This makes me wander, what is wrong with the device of mine. I will run
more checks later. Let's not stall the patch though. In the end, I also
can see the hub registered and working with the driver.


-- 
With best wishes
Dmitry