Re: [PATCH 2/9] usb: dwc3: core: Allow glue layer to pass reference clock

[George Moussalem]

On 8/30/26 13:42, Krzysztof Kozlowski wrote:
> On Tue, Aug 25, 2026 at 02:42:27PM +0400, George Moussalem wrote:
>> Add ability to pass a reference clock from the glue layer to the DWC3
>> core driver. The core calculates the reference clock period and frame
>> length adjustment based on the reference clock rate.
>>
>> In the flattened snsp-dwc3 model, it is currently not possible to pass a
>> reference clock that differs from the default since:
>> commit 613a2e655d4d ("usb: dwc3: core: Expose core driver as library")
>>
>> The new glue layers (incl. Qualcomm's) set the ignore_clocks_and_resets
>> flag in dwc3_probe_data to true, which disables the core driver's clock
>> management, thus it also doesn't acquire the reference clock from the
>> devicetree needed in dwc3_ref_clk_period.
>>
>> There's an existing DT property 'snps,quirk-ref-clk-period-ns', but
> 
> Where? git grep gave me zero results.

Yeah, fixed in next version, should be: snps,ref-clock-period-ns

> 
> Best regards,
> Krzysztof
>