[PATCH v2 07/11] mmc: sdhci-of-arasan: Add ability to export card clock

Doug Anderson dianders at chromium.org
Wed Jun 15 09:40:41 PDT 2016


On Mon, Jun 13, 2016 at 4:04 PM, Douglas Anderson <dianders at chromium.org> wrote:
> 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 in order to function
> properly.  Let's add the ability to expose this clock.  Any PHY that
> needs to know the clock rate can add a reference and query the clock
> rate.
> At the moment we register a CLK_GET_RATE_NOCACHE clock that simply
> allows querying the clock.  This allows us to be less intrusive with
> regards to the main SDHCI driver, which has complex logic for adjusting
> the SD clock.  Right now we always fully power cycle the PHY when the
> clock changes and that gives the PHY a good chance to query our clock.
> Signed-off-by: Douglas Anderson <dianders at chromium.org>
> ---
> Changes in v2: None
>  drivers/mmc/host/sdhci-of-arasan.c | 125 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 122 insertions(+), 3 deletions(-)

I've sent out a new version of just this patch as "version 2.1" to
address a problem found by Guenter Roeck.  Please see
<https://patchwork.kernel.org/patch/9178951/>.  If it's handy for me
to send out a whole new v3 series, please let me know.


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