Re: [PATCH 1/2] cs5535-gpio: add AMD CS5535/CS5536 GPIO driver support

[Andres Salomon <dilinger@collabora.co.uk>]

On Sat, 15 Aug 2009 12:59:48 +0200
Tobias Müller <Tobias_Mueller@twam.info> wrote:

> 2009/7/2 David Brownell <david-b@pacbell.net>:
> > Correct-but-annoying ... and maybe worth changing.  The
> > direction *displayed* may not reflect the actual hardware
> > until after that GPIO signal is initialized.  Boot firmware
> > may well have set the direction; Linux shouldn't change it
> > without explicit instructions to do so.
> OK. If this is a know problem with all GPIO drivers, we can
> skip these to two lines to set in pin a defined state.
> 
> > So it would be nice to remove the heuristic.  The best
> > way would be to add a new method to query gpio direction.
> > Then that when it's available, instead of the heuristic.
> This can be implemented when the GPIO interface supports it.
> 
> The problem with the mask still occurs. I changed to default
> mask to 0x0F7FFFFF, so that all pins except the reserved
> ones and the power-pin (which needs special handling) are
> enabled. Shall we keep it this way (which I prefer) or delete
> it entirely?
> 

Hi Tobias,

At this point, I've lost track of all the changes that need to be
made.  Would you mind submitting your current patch w/ all of the
updates we talked about, and we can go from there?  If possible, it'd
be nice to get the cs5535-gpio stuff into the next merge window (but
we'd need to get moving on this now in order to do that).