[PATCH] i.MX51: Full iomux support

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

On Wed, Dec 15, 2010 at 04:10:16PM +0100, Lothar Wa?mann wrote:
> Hi,
> 
> Arnaud Patard (Rtp) writes:
> > Sascha Hauer <s.hauer@pengutronix.de> writes:
> [...]
> > > The following series picks up the patch from Lothar Wa?mann replacing
> > > the struct pad_desc with a 64bit variable and adds full i.MX51 iomux
> > > support based on this patch.
> > > The iomux configurations are taken from the Freescale pinmux tool, so the
> > > definitions should be rather complete. Anyway, there are some modes
> > > not present in the tool.
> > > I took the padmux settings from the old iomux support where present.
> > 
> > I'm seeing a lot of changes in the iomux file and I have a patch [1]
> > setting the SION bit for all gpios configuration so that reading the PSR
> > value is giving usefull results when the gpio is configured as output. I
> > wanted to send it this week but it will obviously conflict with
> > this. Should I test your patchset first and if it's working, wait
> > for its merge or should I send it anyway ? How do you want to deal with
> > this (as long as you're fine with setting the SION bit for all gpios) ?
> > 
> I had done the same, but had some trouble with this.
> E.g. on our board GPIO1_7 is used as a generic GPIO to enable an
> external clock oscillator for the USBH1 ULPI PHY. When the SION bit
> for this pad was set, I got strange errors on the USBH1 port
> (disconnecting low speed devices behind a hub would stall the
> bus). When I removed the SION bit for that pin everything worked
> well.
> 
> It looks like the SION setting may adversly affect the GPIO functions
> on the i.MX51.

This seems to suggest that we should leave the SION settings for the
gpios up to the board. With a simple bitmask it's easy enough for the
boards to customize the pinmux settings.

Sascha


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