[PATCH 5/5] ARM: dts: imx51-babbage: Fix esdhc setup

[s.hauer@pengutronix.de (Sascha Hauer)]

On Sun, Jun 01, 2014 at 11:22:19PM +0800, Shawn Guo wrote:
> On Fri, May 23, 2014 at 02:33:04PM +0200, Sascha Hauer wrote:
> > - Move cd/wp pinctrl from the hog group to the esdhc groups
> > - use gpio for card detection / write protection on esdhc2 since
> >   the controller based detection does not work
> 
> I tracked it a little bit and found that the controller based detection
> works fine with v3.13 and starts being broken from v3.14-rc1.  The
> offending commit seems to be 89d7e5c13122 (mmc: sdhci-esdhc-imx: add
> runtime pm support).

This makes sense. When the controller is disabled it obviously can't
detect card insertion/removal events anymore. So you can only have one:
controller based card detection or runtime pm for the controller.
So it probably makes sense to use gpio card detection whenever possible
to get additional power savings.

Sascha

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