[U-Boot] BayTrail I2C support

[Bin Meng]

Hi Stefan,

On Sun, Mar 13, 2016 at 10:52 AM, Simon Glass <sjg at chromium.org> wrote:
> Hi Stefan,
>
> On 11 March 2016 at 10:33, Stefan Roese <sr at denx.de> wrote:
>> Hi Simon, Hi Bin,
>>
>> could you please let me know, what the status of I2C support for
>> BayTrail in U-Boot is? Is this driver generic enough to handle
>> BayTrail / Minnowboard MAX as well (I haven't looked in depth yet)?
>> Or what needs to be done to get BayTrail supported here?
>
> There is a dummy driver but it does not work. It needs to be filled
> out with an implementation using the datasheet or perhaps looking at
> coreboot smbus code.
>

I guess Stefan is not looking for legacy SMBUS support, instead the
SIO I2C device on device 24 on BayTrail. It is currently not
supported. The IP used on BayTrail is from Synopsis Designware, and
this I2C IP is also seen on Intel Quark. It is possible we can reuse
U-Boot Synopsis I2C driver on Intel platform, with adaptations to PCI.

Regards,
Bin