[PATCH v3 1/4] i2c: tegra: implement slave mode

[wsa@the-dreams.de (Wolfram Sang)]

> Sorry for the long delay. I tried to analyze the issue. Attached patch works
> on AC100 (Misha Komarovsky helped me with testing).
> 
> Wolfram could you please try the patch with your environment?

No change, sadly. I don't get slave interrupts.

> Init function is called multuple times. If I2C controller works
> in slave mode, then driver must keep slave registers otherwise
> slave configuration will be reseted.

This patch does not tackle the main issue, though. There should not be a
"slave mode" for the controller. It can be a master and slave
simultaneously and should do the right thing depending on what's
happening on the bus. The Tegra2 manual I have says "The Master can
address the internal slave (for basic testing) or an external 7-bit or
10-bit addressed Slave device." So even a loopback should be possible
(if we trust the manual ;)).

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