From mboxrd@z Thu Jan 1 00:00:00 1970 From: adrian.hunter@intel.com (Adrian Hunter) Date: Wed, 22 Jun 2016 15:35:06 +0300 Subject: [PATCH v3 11/15] mmc: sdhci-of-arasan: Add ability to export card clock In-Reply-To: <1466445414-11974-12-git-send-email-dianders@chromium.org> References: <1466445414-11974-1-git-send-email-dianders@chromium.org> <1466445414-11974-12-git-send-email-dianders@chromium.org> Message-ID: <576A85FA.2000309@intel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > Reviewed-by: Heiko Stuebner > Tested-by: Heiko Stuebner Acked-by: Adrian Hunter