Re: [PATCH v2 0/2] i2c:dw: Add APM X-Gene ACPI I2C device support

Jarkko Nikula
2015-12-16T12:53:02Z

On 12/16/2015 11:04 AM, Mika Westerberg wrote:
> On Tue, Dec 15, 2015 at 11:20:03AM -0800, Loc Ho wrote:
>> Can we not just add an AML method that will return the operation clock
>> frequency that the I2C driver can use? If the method doesn't existed,
>> we will just bail and do nothing or assume what ever default behavior?
>
> Why would you add yet another method? There already are existing ACPI
> *CNT methods that you can use, and are used in systems out there.

One thing to remember that *CNT methods allow more precise machine and
per bus specific tunings against different HW characteristics like
pull-up resistance, line load, propagation delay, etc.

--
Jarkko