linux-kernel - Re: [PATCH v3 11/15] mmc: sdhci-of-arasan: Add ability to export card clock

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Date:	Wed, 22 Jun 2016 15:35:06 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Douglas Anderson <dianders@...omium.org>, ulf.hansson@...aro.org,
	Heiko Stuebner <heiko@...ech.de>
Cc:	kishon@...com, robh+dt@...nel.org, shawn.lin@...k-chips.com,
	xzy.xu@...k-chips.com, briannorris@...omium.org,
	linux-rockchip@...ts.infradead.org, linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org, groeck@...omium.org,
	michal.simek@...inx.com, soren.brinkmann@...inx.com,
	geert@...ux-m68k.org, wsa+renesas@...g-engineering.com,
	linus.walleij@...aro.org, horms+renesas@...ge.net.au,
	andrei.pistirica@...rochip.com, ludovic.desroches@...el.com,
	stefan.wahren@...e.com, yangbo.lu@...escale.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 11/15] mmc: sdhci-of-arasan: Add ability to export card
 clock

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@...omium.org>
> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> Tested-by: Heiko Stuebner <heiko@...ech.de>

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