linux-kernel - Re: [PATCH v2 1/4] dwc3: exynos: Add support for SCLK present on Exynos7

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Date:	Tue, 14 Oct 2014 10:23:36 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Anton Tikhomirov <av.tikhomirov@...sung.com>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	"robh+dt" <robh+dt@...nel.org>, kishon <kishon@...com>
Subject: Re: [PATCH v2 1/4] dwc3: exynos: Add support for SCLK present on Exynos7

Hi Tomasz,


On Tue, Oct 14, 2014 at 6:56 AM, Anton Tikhomirov
<av.tikhomirov@...sung.com> wrote:
> Hello,
>
>> Hi Anton,
>>
>> On 13.10.2014 06:54, Anton Tikhomirov wrote:
>> > Hi Vivek,
>> >
>> >> Exynos7 also has a separate special gate clock going to the IP
>> >> apart from the usual AHB clock. So add support for the same.
>> >
>> > As we discussed before, Exynos7 SoCs have 7 clocks to be controlled
>> > by the driver. Adding only sclk is not enough.
>> >
>>
>> I'm quite interested in this discussion. Has it happened on mailing
>> lists?
>
> No, we used company messenger for the discussion.

Yea, we head a round of discussion at our end regarding this, and we are
going to get more clarity on this from our H/W team too, this week.

>
>>
>> In general, previous SoCs also gave the possibility of controlling all
>> the bus clocks separately, in addition to bulk gates, but there was no
>
> correct
>
>> real advantage in using those, while burdening the clock tree with
>> numerous clocks. Isn't Exynos7 similar in this aspect?
>
> Exynos7 doesn't have "Gating all clocks for USBDRD30" bit. The clocks
> should be controlled separately.

true, on Exynos7 we have separate gates for the available clocks going to
USB-DRD block. So we will have to add these basic required number of
clocks.





-- 
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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