[v4] USB: serial: cp210x: Implement GPIO support for CP2102N

[Johan Hovold <johan@kernel.org>]

On Fri, Jul 20, 2018 at 04:22:17PM +0100, Martyn Welch wrote:
> On Fri, 2018-07-20 at 12:35 +0000, Karoly Pados wrote:
> > This patch adds GPIO support for CP2102N devices.
> > 
> > It introduces new generic code to support emulating separate
> > input and outputs directions even though these devices
> > only know output modes (open-drain and pushpull). Existing
> > GPIO support for CP2105 has been migrated over to the new
> > code structure.
> > 
> > Only limitation is that for the QFN28 variant, only 4 out of
> > 7 GPIOs are supported. This is because the config array
> > locations of the last 3 pins are not documented, and reverse
> > engineering revealed offsets that conflicted with other
> > documented functions. Hence we'll play it safe instead
> > until somebody clears this up further.
> > 
> > Signed-off-by: Karoly Pados <pados@pados.hu>

Thanks for the updated commit message, looks goods now.

> As Johan made some changes, I think his Signed-off-by should be here
> as is in v3.

Right. I actually just replaced the commit message in v3 which had a
note about what I had changed.

> Other than that:
> 
> Acked-by: Martyn Welch <martyn.welch@collabora.co.uk>

Thanks for the ack.

And again, thanks to both of you for getting this useful functionality
in place.

Johan
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