[RFC usb-next v5 1/3] dt-bindings: usb: add the documentation for USB root-hub

Neil Armstrong narmstrong at baylibre.com
Thu Oct 19 02:54:29 PDT 2017

On 18/10/2017 11:05, Arnd Bergmann wrote:
> On Tue, Oct 17, 2017 at 11:19 PM, Martin Blumenstingl
> <martin.blumenstingl at googlemail.com> wrote:
>>> Ok, very good!
>>>> is there anything else you want me to test?
>>> What about the same dtb when run on a kernel without your
>>> patch series? Does that work as well, or are your patches
>>> required to make it work?
>> this is the only device I have which uses devicetree and a xHCI
>> controller. I can test it with a dwc2 based device though if you want
> Does dwc2 also use separate nodes for the roothub? From your
> description it sounds like it would not be affected by your patch.
> To rephrase what I'm interested in, can you check that with your
> patch series, we correctly associate a device node in DT with the
> struct device in the kernel both with and without the optional
> roothub node in the dtb?
> Since you used a dtb that already listed an endpoint device below
> an xhci, that would answer my earlier question of whether it worked
> before your patch series, and you tested that it still works with your
> patches applied and the roothub node added in the dtb.  Now we
> just need to make sure we don't break existing dtb files that don't
> have the roothub node but do have endpoint device nodes.
>        Arnd
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Hi Arnd,

I tested in the same conditions :
- On Odroid-C2 using DWC2, but not using the roothub functionnality
- patch v6 applied
- node for on-board hub
- printk in usb core

And it works :
[    8.767964] usb 1-1: of_node /soc/usb at c9100000/hub at 1 parent /soc/usb at c9100000
[    8.955901] usb 1-1: new high-speed USB device number 2 using dwc2
[    9.165641] hub 1-1:1.0: USB hub found
[    9.165939] hub 1-1:1.0: 4 ports detected


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