[U-Boot] [PATCH] i.MX6: mx6qsabrelite: Add keypress support

[Wolfgang Denk]

Dear Eric Nelson,

In message <1330732824-15345-1-git-send-email-eric.nelson at boundarydevices.com> you wrote:
> This patch adds support for the GPIO keyboard used on MX6Q SabreLite.
> 
> This is generally used for invoking Android "recovery mode" in
> response to a long press of volume key down during boot.
> 
> This can be tested by a boot script like so:
>     if keypress voldown && sleep 1 && keypress voldown ; then
>           echo "do recovery thing" ;
>     fi
> 
> Key values can be seen by issuing keypress with no arguments:

I don't like introducing yet another way to handle key presses and
create menu like interfaces from this.

We already have two of these:

- We have the powerful and flexible method to map key preesses to
  envrionment variables which can in turn hold commands (variables
  "magic_keys" and "key_magic*") as used for example on the enbw_cmc,
  lwmon5, hmi1001, mucmc52, pcs440ep, r360mpi and mucmc52 boards.

- We have the menu system as implemented by common/menu.c etc.


Please use either of these, but don't invent a new one.  Thanks.

Best regards,

Wolfgang Denk

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