[Gta04-owner] I2C3 on the GTA04

[Paul Kocialkowski]

I'm currently working on an OMAP3630 phone (P970, LG Optimus Black),
where I am attempting to port X-Loader to it. To make it easier for me,
I'm using the GTA04 as a reference platforms, since its DM3730 is close
enough to the OMAP3630.

On the P970, X-Loader starts, I have serial, RAM clocks and a few other
things working nicely, but I need to use the I2C3 lines to activate the
MMC1 (sd card) power supply, which is provided by an external PMIC (not
TWL5030) connected to I2C3.

Despite all my attempts, I cannot get I2C3 to work on the P970, so I
figured I would try on the GTA04 and work from there, but it doesn't
seem to work either. From the U-Boot prompt:

GTA04 # i2c probe
Valid chip addresses: 48 49 4A 4B

This is on I2C1 (default) and the chips that show up are the TWL4030
modules.

GTA04 # i2c dev 1
Setting bus to 1
GTA04 # i2c probe
Valid chip addresses: 11 1E 33 41 45 48 50 54 68 77

This is on I2C2 and the chips are the various GTA04 ICs.

When it comes to I2C3:
GTA04 # i2c dev 2
Setting bus to 2
GTA04 # i2c probe
Valid chip addresses:timed out in wait_for_bb: I2C_STAT=1000
timed out in wait_for_bb: I2C_STAT=1000

Do you have any idea of why it doesn't work on either device? That could
really help me sort out the situation for P970, where I2C3 is actually
needed!

I2C3 does require external pullup resistors, which are present on P970
but I'm not sure about GTA04, so that might be causing the issue on the
GTA04, but not on P970.

-- 
Paul Kocialkowski, Replicant developer

Replicant is a fully free Android distribution

Website:        http://www.replicant.us/
Wiki/Tracker:   http://redmine.replicant.us/
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