On 2015-05-28 22:03, Vaibhav Hiremath wrote:

From: "Jett.Zhou" <redacted>

TWSI_ILCR & TWSI_IWCR registers are used to adjust clock rate
of standard & fast mode in pxa910/988; so this patch adds these two 
new
entries to "struct pxa_reg_layout" and "struct pxa_i2c" and also adds 
two
new DT properties to take configuration value for the same.

Mapping registers 1:1 to DT is nearly always wrong. We have some 
generic bindings for SCL/SDA tweaking. Check 
Documentation/devicetree/bindings/i2c/i2c-designware.txt for them and if 
they match your needs. (Yes, they should be in a more generic place).