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Date:	Tue, 14 Oct 2014 10:23:36 +0530
From:	Vivek Gautam <>
To:	Tomasz Figa <>
Cc:	Anton Tikhomirov <>,
	Linux USB Mailing List <>,
	"" <>,
	"" <>,
	"" <>,
	Greg KH <>,
	Felipe Balbi <>,
	Kukjin Kim <>,
	Mark Rutland <>,
	Pawel Moll <>,
	"robh+dt" <>, kishon <>
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
<> 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

Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
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