[MinnowBoard] i2c support

[Tony]

Hi John 'Warthog9' Hawley,
	Thank you very much. It is bus 7. I can see the clock when I run i2cget.

I guess something might be wrong with my led controller, which cause the 
read to fail. But thanks to you I know Minnowboard is working :)

Many Thanks,
Tony

On 04/03/16 16:38, John 'Warthog9' Hawley wrote:
> The LSE and HSE's I2C is on physical interface #5 (which is the
> DesignWare IP), but that doesn't mean it enumerates in the OS to #5.  In
> your i2cdetect you'll note that the first DesignWare adapter is on bus
> #7.  Re-running your tests on that bus should get you what you are
> expecting.  I *HAVE* seen in a couple of cases where i2cdetect on the
> bus won't report some devices, but if you attempt to read/write directly
> to the address (I.E. just assume it's there) things work.  The issue
> there is that some devices don't quite implement smbus / i2c quite right
> and get confused on how to respond to the detection.
>
> Let me know if that works, and if it doesn't we'll try some additional
> things.
>
> - John 'Warthog9' Hawley
>
> On 03/04/2016 07:58 AM, Tony wrote:
>> Hi,
>>      I am trying to talk to TI led controller using i2c#5, pin 13 and 15.
>> But for some reason I cant get the i2c pins working. I tried connecting
>> i2c probe on the pins. But don't see any clock when I do i2cdetect.
>>
>> sudo i2cdetect -y 5
>>
>> I am using xubuntu kernel 4.4. The related kernel modules I could find are
>>
>> i2c_designware_platform and i2c_designware_core
>>
>> For some reason i2c-5 is getting used by display driver.
>>
>> i2cdetect -l
>> i2c-0    unknown       i915 gmbus ssc                      N/A
>> i2c-1    unknown       i915 gmbus vga                      N/A
>> i2c-2    unknown       i915 gmbus panel                    N/A
>> i2c-3    unknown       i915 gmbus dpc                      N/A
>> i2c-4    unknown       i915 gmbus dpb                      N/A
>> i2c-5    unknown       i915 gmbus dpd                      N/A
>> i2c-6    unknown       DPDDC-B                             N/A
>> i2c-7    unknown       Synopsys DesignWare I2C adapter     N/A
>> i2c-8    unknown       Synopsys DesignWare I2C adapter     N/A
>>
>>
>> Any suggestions on what I might be doing wrong?
>>
>> Many Thanks,
>> Tony
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>>
>
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