[U-Boot] [PATCH] ARMV7: OMAP: I2C driver: Fix bug found in 37XX testing

[Heiko Schocher]

Hello Steve,

Steve Sakoman wrote:
> On OMAP36/37XX the standard on chip pullups are not sufficient to
> ensure proper i2c operation without external pullups or switching
> to high speed mode and enabling special on chip pullups.
> 
> This is an issue for Beagle xM, which does not have external pullups
> on the expansion board i2c lines.
> 
> The issue manifests itself as an AL (arbitration lost) error when
> probing for a non-existent device (i.e. on a Beagle xM with no expansion
> boards attached).  This issue does not occur on expansion boards that
> include pullups or on Overo 37XX COM's since they include pull-ups.
> 
> This patch fixes the issue by checking for the AL bit in the i2c_probe
> function.
> 
> Signed-off-by: Steve Sakoman <steve.sakoman at linaro.org>
> ---

Tested it here on my beagle board too, thanks!

Texas Instruments X-Loader 1.4.2 (Feb 19 2009 - 12:01:24)


U-Boot 2010.09-04580-g4df6689 (Oct 25 2010 - 07:57:35)

OMAP3530-GP ES3.0, CPU-OPP2, L3-165MHz, Max CPU Clock 600 mHz
OMAP3 Beagle board + LPDDR/NAND
I2C:   ready
[...]

Applied to u-boot-i2c master

bye,
Heiko
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