Re: [RESEND PATCH 0/1] add multiple clock handling for dwc2 driver

[Frank Wang]

Hi Heiko,

On 2017/2/5 17:41, Heiko Stuebner wrote:
> Hi Frank,
>
> Am Sonntag, 5. Februar 2017, 10:51:00 CET schrieb Frank Wang:
> > The original posting on Jan 19th have not received any responses, so I
> > resend them.
> >
> > The Current default dwc2 just handle one clock named otg, however, it may
> > have two or more clock need to manage for some new SoCs(such as RK3328), so
> > this adds change clk to clk's array of dwc2_hsotg to handle more clocks
> > operation.
> can you please give a bit more detail on the specific layout.
>
> I guess you're talking about hclk_otg_pmu, right? What component does it
> supply, because I didn't find anything in the partial TRM in the PMU section
> relating to the "otg".

Yes, it is hclk_otg_pmu.

The rock-chip hclk_otg_pmu is an input clock for dwc2 PMU module which 
named pmu_hclk in chapter 2.4 of dwc otg databook v3.10.
Please refer to the following simple clock tree from CRU part of rk3328 
TRM.
                                 _ _ _ ...
                                |
                                |- - -> G19_8 - - - hclk_otg - - - - - - ->
hclk_peri_pre - - ->|
|- - -> G19_9 - - - hclk_otg_pmu - - ->
                                |_ _ _ ...

BR.
Frank

> This meant to make sure, you're actually controlling some part of the dwc2
> with that second/third/... clock and not some separate component.
>
>
> Heiko