[RESEND PATCH 0/1] add multiple clock handling for dwc2 driver
frank.wang at rock-chips.com
Sun Feb 5 17:40:35 PST 2017
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
> 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
_ _ _ ...
|- - -> G19_8 - - - hclk_otg - - - - - - ->
hclk_peri_pre - - ->|
|- - -> G19_9 - - - hclk_otg_pmu - - ->
|_ _ _ ...
> This meant to make sure, you're actually controlling some part of the dwc2
> with that second/third/... clock and not some separate component.
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