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

Hi,

On Mon, Jun 13, 2016 at 4:04 PM, Douglas Anderson [off-list ref] 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@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.

-Doug