linux-kernel - Re: [PATCH 2/2] ARM: Exynos4: Register clocks via common clock framework

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Date:	Mon, 08 Oct 2012 09:31:16 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Thomas Abraham <thomas.abraham@...aro.org>
Cc:	chander.kashyap@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, kgene.kim@...sung.com,
	mturquette@...aro.org, mturquette@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: Exynos4: Register clocks via common clock
 framework

On Monday 08 of October 2012 12:04:18 Thomas Abraham wrote:
> Hi Tomasz,
> 
> On 3 October 2012 19:40, Tomasz Figa <t.figa@...sung.com> wrote:
> > Hi Chander, Thomas,
> > 
> > I can see one more problem here.
> > 
> > Based on the fact that sdhci-s3c driver receives only the endpoint gate
> > clock (hsmmc), doesn't the following setup make the driver unable to
> > change the frequency of this clock?
> 
> The driver never changes the clock frequency of the core system clocks
> nor of the endpoint. There are internal dividers inside the sdhci
> controller which are divide to acheive required clock speed.

What is the use of sdhci_cmu_set_clock (which calls clk_set_rate) in sdhci-
s3c, then?

I think you are missing CLK_SET_RATE_PARENT flags in clocks of which rate 
can be changed by the driver.

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center

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