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

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Message-ID: <CAD=FV=UH+5bs8TUe+nOKnmEsYL+7iF2JkKri2kzRgHYpyDLK1Q@mail.gmail.com>
Date:	Wed, 15 Jun 2016 09:40:41 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Heiko Stuebner <heiko@...ech.de>,
	Rob Herring <robh+dt@...nel.org>
Cc:	Shawn Lin <shawn.lin@...k-chips.com>,
	Ziyuan Xu <xzy.xu@...k-chips.com>,
	Brian Norris <briannorris@...omium.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Douglas Anderson <dianders@...omium.org>,
	Michal Simek <michal.simek@...inx.com>,
	soren.brinkmann@...inx.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Guenter Roeck <groeck@...omium.org>
Subject: Re: [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 <dianders@...omium.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@...omium.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