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

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Message-id: <001801cfe74d$e4cb23d0$ae616b70$%tikhomirov@samsung.com>
Date:	Tue, 14 Oct 2014 10:26:35 +0900
From:	Anton Tikhomirov <av.tikhomirov@...sung.com>
To:	'Tomasz Figa' <tomasz.figa@...il.com>,
	'Vivek Gautam' <gautam.vivek@...sung.com>,
	linux-usb@...r.kernel.org
Cc:	linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, balbi@...com, kgene.kim@...sung.com,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org,
	kishon@...com
Subject: RE: [PATCH v2 1/4] dwc3: exynos: Add support for SCLK present on
 Exynos7

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.

> 
> 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.

> 
> Best regards,
> Tomasz
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