[U-Boot] [PATCH] cros-ec-keyboard: Synchronize DT binding from linux

[Sjoerd Simons <sjoerd.simons@collabora.co.uk>]

On Mon, 2014-12-15 at 23:34 +0100, Pavel Machek wrote:
> On Thu 2014-11-27 16:34:08, Sjoerd Simons wrote:
> > The ChromeOS EC keyboard is used by various different chromebooks. Peach
> > pi being the third board in the u-boot tree to use it (snow and peach
> > pit the other two). Rather then embedding the same big DT node in the
> > peach-pi DT again, copy the dtsi snippit & bindings documentation from
> > linux and include it in all 3 boards.
> > 
> > This slightly changes the dt bindings in u-boot:
> ...
> >   * google,repeat-delay-ms and google,repeat-rate-ms are no longer used
> >     and replaced by hardcoded values (similar to tegra kbc)
> 
> If more than one board needs this (and it clearly does) it would be
> good to make the binding "official"...? I guess that means talking to
> linux Documentation/devicetree maintainers...

Device tree is for describing hardware, while repeat rate & delay are
user preferences, not something inherent to the hardware. As such, those
properties do not belong in device-tree in the first place.

Fwiw, Linux by default uses a delay of 250ms and a period of 33ms unless
the driver handles auto-repeat (e.g. for PS2 which does repeat in
hardware). If your goal is to fix the hardcoding of these values in
various drivers, it's probably better to make u-boot input core have
sane defaults for repeat rather then pushing it out into device-tree.

-- 
Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Collabora Ltd.
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