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

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Date:   Mon, 6 Feb 2017 10:20:55 +0800
From:   Frank Wang <frank.wang@...k-chips.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     johnyoun@...opsys.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, huangtao@...k-chips.com,
        kever.yang@...k-chips.com, william.wu@...k-chips.com,
        elaine.zhang@...k-chips.com, frank.wang@...k-chips.com
Subject: Re: [RESEND PATCH 0/1] add multiple clock handling for dwc2 driver

Sorry to reformat the graph.

On 2017/2/6 9:40, Frank Wang wrote:
> 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
>>
>>
>>
>