On Thu, 31 Jul 2008, Grant Likely wrote:

quoted

quoted

 I'm a bit confused. The frequency of the I2C source clock and the real I2C
clock frequency are two different things. The first one is common for all
I2C devices, the second can be different. What properties would you like to
use for defining both?

How is the divider controlled?  Is it a fixed property of the SoC?

Usually.

a shared register setting?

Sometimes.

or a register setting within the i2c device?

Never.


Thinking of it as the CCB divided by 1, 2, 3 isn't really right.  It's just
some internal clock that I2C was connected to.  Sometimes it's the clock
for the ethernet block of the SoC.  Sometimes it comes from some other
block.