linux-kernel - Re: [PATCH RFC] ARM: dts: mxs: leave card detect out of common mmc pins config

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Date:	Mon, 8 Apr 2013 22:50:21 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Hector Palacios <hector.palacios@...i.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"maxime.ripard@...e-electrons.com" <maxime.ripard@...e-electrons.com>,
	"marex@...x.de" <marex@...x.de>,
	"fabio.estevam@...escale.com" <fabio.estevam@...escale.com>
Subject: Re: [PATCH RFC] ARM: dts: mxs: leave card detect out of common mmc
 pins config

On Mon, Apr 08, 2013 at 03:58:05PM +0200, Hector Palacios wrote:
> On 04/08/2013 02:48 PM, Shawn Guo wrote:
> >On Mon, Apr 08, 2013 at 12:12:20PM +0200, Hector Palacios wrote:
> >>MicroSD card sockets don't usually have card detect line. This pin
> >>is actually not needed for the MMC to work and it is more of a
> >>platform design decission to have it.
> >>The card detect pin already has a configuration entry of its own:
> >>'mmc0_cd_cfg' so we complete the iomux configuration here and let
> >>platforms to include it or not depending on whether the card detect
> >>line is routed to the SD socket.
> >>
> >Sounds sensible.
> >
> >>Signed-off-by: Hector Palacios <hector.palacios@...i.com>
> >>---
> >>
> >>Hello,
> >>
> >>All imx28 based platforms except 'bluegiga,apx4devkit' and
> >>'schulercontrol,imx28-sps1', use 'mmc0_cd_cfg' in their mmc configuration
> >>so please check whether this patch would break these platforms.
> >>
> >I just tested the patch on imx28-evk and card-detection still works.  So
> >patches applied, thanks.
> 
> The EVK and most platforms will work because they are using
> 'mmc0_cd_cfg' so actually this patch does not change anything on
> them.
> Platforms 'bluegiga,apx4devkit' and 'schulercontrol,imx28-sps1'
> however are not referencing 'mmc0_cd_cfg' so after applying this
> patch they will have unconfigured CD line and they may break.

Ah, yes.  I thought that any board that has CD support has to reference
'mmc0_cd_cfg'.  That's not necessarily true.

> The driver will call get_cd() upon probing, which returns the status of the CD line.
> Please check these two platforms before applying.

Ok, let's wait for people owning the boards to confirm.

Shawn

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