linux-kernel - Re: [REPOST PATCH v3 1/4] mmc: dw_mmc: Add "disable-wp" device tree property

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Message-ID: <20130110230121.GA20584@quad.lixom.net>
Date:	Thu, 10 Jan 2013 15:01:21 -0800
From:	Olof Johansson <olof@...om.net>
To:	Doug Anderson <dianders@...omium.org>
Cc:	linux-mmc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Will Newton <will.newton@...tec.com>,
	Chris Ball <cjb@...top.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org
Subject: Re: [REPOST PATCH v3 1/4] mmc: dw_mmc: Add "disable-wp" device tree
 property

On Thu, Jan 10, 2013 at 10:24:26AM -0800, Doug Anderson wrote:
> The "disable-wp" property is used to specify that a given SD card slot
> doesn't have a concept of write protect.  This eliminates the need for
> special case code for SD slots that should never be write protected
> (like a micro SD slot or a dev board).
> 
> The dw_mmc driver is special in needing to specify "disable-wp"
> because the lack of a "wp-gpios" property means to use the special
> purpose write protect line.  On some other mmc devices the lack of
> "wp-gpios" means that write protect should be disabled.

Hi,

The previous code used the controller-common quirk field to set a
per-controller DW_MCI_QUIRK_NO_WRITE_PROTECT. Is there really need to
do this per-slot? And if so, please explain in the commit message why
there is need for a brand new quirk for the same functionality.

It's even uncertain if there are any systems out there that uses the
multi-slot functionality of this driver to date, most seem to map one
slot per controller in the first place...


-Olof
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