Layerscape中的主题 Re: USB 3.0 ref clk errors when nxp-ls1028 boot with LSDK20.04

USB 3.0 ref clk errors when nxp-ls1028 boot with LSDK20.04

hittzt — Thu, 20 Aug 2020 02:47:38 GMT

Hi experts,

As the subject says, the nxp-ls1028ardb board shows:

dwc3 3100000.usb: Failed to get clk 'ref': -2

dwc3 3110000.usb: Failed to get clk 'ref': -2

when it boots, and on other LS boards, like nxp-lx2160ardb, ls1043ardb etc.

I find that this issue is caused by the lack of clock-names and clocks in related dts file, which are

required by the dwc3(refer to Documentation/devicetree/bindings/usb/dwc3.txt in kernel codes).

So this may be a generic issue, I want to query will this be fixed in future?

Thanks,

Zhantao

yipingwang — Thu, 20 Aug 2020 08:56:54 GMT

Please refer to the following comment from LSDK development team.

For ' Failed to get clk 'ref': -2', this is a known issue introduced by upstream patch: https://www.spinics.net/lists/linux-usb/msg169893.html

However, I think this error will not damage USB function. For Layerscape platforms, we don't need to handle clock in dwc3 core driver, actually.

hittzt — Fri, 21 Aug 2020 01:54:22 GMT

Hi Yiping,

Thanks for your kindly reply.

Got it.

Regards,

Zhantao