Am Freitag, den 21.06.2013, 10:24 -0600 schrieb Stephen Warren:
> On 06/20/2013 03:08 PM, Anna-Maria Gleixner wrote:
> > The nvidia,tristate entry for the pinmux of i2c1 an i2c3 was set to
> > tristate. This results in non working i2c, because the i2c pins are
> > not actively driven. Set the entries to "driven".
>
> Lucas, can you please comment on this patch? It sounds correct to me,
> but I would have assumed you'd tested I2C already when you wrote the
> original DT?
>
This is a NACK from me. For robustness reasons all pins/busses not
actually used on the Colibri module itself are tristated in order to
avoid any invalid configurations when placed on a baseboard.
Baseboards using particular busses should untristate those pins in their
respective dts. So if this change is about iris, I would be ok with
enabling i2c1, as this is actually routed on this baseboard, but not
i2c3.
Regards,
Lucas
> Oh actually, now that I look further, I see that tegra20-iris-512.dts
> includes this file, and overrides some of the tristate values there.
> What's the thinking behind that, and does this patch fit into it?
>
> > diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi
>
> > nvidia,pins = "rm";
> > nvidia,function = "i2c1";
> > nvidia,pull = <0>;
> > - nvidia,tristate = <1>;
> > + nvidia,tristate = <0>;
> > };
> > i2c3 {
> > nvidia,pins = "dtf";
> > nvidia,function = "i2c3";
> > nvidia,pull = <0>;
> > - nvidia,tristate = <1>;
> > + nvidia,tristate = <0>;
> > };
> > i2cddc {
> > nvidia,pins = "ddc";
>
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