lkml.org 
[lkml]   [2016]   [Jun]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH v3 11/15] mmc: sdhci-of-arasan: Add ability to export card clock
    From
    Date
    On 20/06/16 20:56, Douglas Anderson 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>
    > Reviewed-by: Heiko Stuebner <heiko@sntech.de>
    > Tested-by: Heiko Stuebner <heiko@sntech.de>

    Acked-by: Adrian Hunter <adrian.hunter@intel.com>


    \
     
     \ /
      Last update: 2016-06-22 15:21    [W:2.412 / U:0.012 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site