[PATCH v5 1/3] ARM: mxs: add GPMI-NFC support for imx23/imx28

[u.kleine-koenig@pengutronix.de (Uwe Kleine-König)]

Hello Huang,

On Fri, Jul 08, 2011 at 05:27:11PM +0800, Huang Shijie wrote:
> >>>>The init function is used only to set up iomux, so the logical replacement is
> >>>>a pointer to the iomux data, and calling mxs_iomux_setup_multiple_pads
> >>>>directly from the driver.
> >>>Why not put the iomux stuff into the per-machine table and get rid of
> >>>the init callback, too?
> >>The mmc (ssp) has pin conflict with gpmi on both mx23evk and mx28evk.
> >>So, it's better to initialize the pin when the driver(GPMI or MMC)
> >>is enabled.
> >What do you do to prevent userspace from trying to use both devices?
> The board can not support the two devices at the same time.
> So the user can only use one device with the board.
> 
> >I guess you need to configure the hardware somehow to switch between the
> >two using a jumper? Isn't it possible to detect the hardware setting and
> >setup the muxer accordingly?
> >
> >IMHO an per-device init-callback is the wrong approach to solve a pin
> >conflict.
> Do you have any good solution about this?
Put the pinmux corresponding to the one device that currently works in
the pinmux list!?

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |