[PATCH 2/4] OMAP3 I2C document why cpu type and not peripheral unit ID used to probe

On 03/03/2011 09:12 PM, Somebody in the thread at some point said:

Hi -

Thanks for your comments.

The issue is that this revision field is not really documented in OMAP4
TRM, so you should not rely on it. Moreover, as you already noticed, the
revision number is not even accurate. OMAP3 and 4 are using a different
programming model but this is not reflected in this field.

OK.

Since that issue is quite common in many OMAP IPs, we introduced a SW
field in hwmod_class that should reflect the change in IP programming
model. For the moment it is a simple integer that we increment each time
there is change in a programming model that will impact the driver.

You can check how it was done for the timer for example:

Alright.  In I2C case the path is hwmod class -> platform data though 
since hwmod content directly is not used in the driver, but platform 
data is.

quoted

+
if (cpu_is_omap44xx())
dev->regs = (u8 *) omap4_reg_map;

OK, this is not part of your patch, but any call to cpu_is are forbidden
from the driver. As soon as you have the revision field from hwmod you
can get rid of all that code.

Well, as you point out they are not forbidden enough since I was just 
working with what was already there.

However this hwmod scheme will cover it all AFAICS, so I will extend the 
patches to nuke all cpu_is... from the driver.

-Andy