[U-Boot] [PATCH] RFC: tegra: Avoid using I2C prior to relocation

[Stephen Warren]

On 08/06/2013 11:52 PM, Simon Glass wrote:
> Tegra recently moved to the new I2C framework, which sets up I2C prior to
> relocation, and prior to calling i2c_init_board(). This causes a crash on
> Tegra boards.
> 
> note:
> 
> There are many ways to fix this. I believe this is one. It disables i2c_init()
> until relocation is complete. I have been unable to test it so far due to
> problems getting my Seaboard to work. I will try another Tegra board, but
> send this for comment in the meantime.

Tested-by: Stephen Warren <swarren at nvidia.com>

(On Beaver and Dalmore, tested booting to U-Boot command prompt followed
by "i2c dev 0; i2c probe")

Note: I believe this is an enormous hack that hacks around the problem
of dynamic device initialization just not being well thought out
relative to the restrictions of U-Boot's various boot stages. I'd still
prefer an outright revert of the broken code.

In other words, tegra_i2c_init() simply shouldn't be called at the wrong
time; it shouldn't have to handle being called at the wrong time and
null itself out when that happens.

However, if this is what it takes to get U-Boot working again, then
let's apply it ASAP.