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

[Heiko Stuebner]

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 at chromium.org>
> Acked-by: Rob Herring <robh at kernel.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 at sntech.de>