[RFC 4/4] ARM: shmobile: r8a7790: adapt DTS for I2C slave support

[Wolfram Sang]

> > DT pseudocode:
> >
> >         i2c {
> >                 compatible = "nvidia, tegra-i2c";
> >
> >                 ec-slave at 42 {
> >                         compatible = "nvidia, ax100-ec-slave";
> >                         reg = <0x42>;
> >                 };
> >         };
> 
> So distinguishing between drivers providing slave services (using slave
> mode) and drivers driving actual slave hardware (using master mode) is
> done based on the compatible-property.

We describe users of one specific I2C bus. And the drivers that go along
with them. No?

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