linux-kernel - Re: [PATCH v2 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock

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Message-ID: <5140493.iC6MOixRVW@phil>
Date:	Sat, 18 Jun 2016 20:02:44 +0200
From:	Heiko Stuebner <heiko@...ech.de>
To:	Douglas Anderson <dianders@...omium.org>
Cc:	ulf.hansson@...aro.org, kishon@...com, robh+dt@...nel.org,
	shawn.lin@...k-chips.com, xzy.xu@...k-chips.com,
	briannorris@...omium.org, adrian.hunter@...el.com,
	linux-rockchip@...ts.infradead.org, linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock

Am Montag, 13. Juni 2016, 16:04:30 schrieb Douglas Anderson:
> Some SD/eMMC PHYs (like the PHY from Arasan that is designed to work
> with arasan,sdhci-5.1) need to know the card clock frequency in order to
> function properly.  Physically in a SoC this clock is exported from the
> SDHCI IP block to the PHY IP block and the PHY needs to know the speed.
> Let's export the SDHCI card clock using a standard device tree mechanism
> so that the PHY can get access to it and query the card clock frequency.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> Acked-by: Rob Herring <robh@...nel.org>

Doug and me talked about how to solve this beforehand, so obviously I'm in 
favour of doing it like this :-)

Reviewed-by: Heiko Stuebner <heiko@...ech.de>