[U-Boot] [PATCH] ARM: tegra: make all I2C ports open-drain

[Stephen Warren]

On 03/21/2014 03:27 PM, Tom Warren wrote:
> I've updated u-boot-tegra/next with this patch, rebased it against ARM master, and pushed it to Denx. All tegra boards build OK.
> 
> Albert - if you want, you can use u-boot-tegra/next to bring in this patch, or apply it to ARM master yourself, or I can do a formal PR. Let me know. Or TomR can just apply it to Denx master.

I haven't seen any response to this, so I assume simply sending a pull
request is the best way forward.

> Tom
> 
>> -----Original Message-----
>> From: Stephen Warren [mailto:swarren at wwwdotorg.org]
>> Sent: Friday, March 21, 2014 11:31 AM
>> To: u-boot at lists.denx.de; Simon Glass; Tom Warren; Stephen Warren
>> Cc: Tom Rini
>> Subject: Re: [U-Boot] [PATCH] ARM: tegra: make all I2C ports open-drain
>>
>> On 03/12/2014 01:10 PM, Stephen Warren wrote:
>>> From: Stephen Warren <swarren at nvidia.com>
>>>
>>> I2C protocol requires open-drain IOs. Fix the Dalmore and Venice2
>>> pinmux tables to configure the IOs correctly. Without this, Tegra may
>>> actively drive the lines high while an external device is actively
>>> driving the lines low, which can only lead to bad things.
>>
>> Tom (or Tom or Albert),
>>
>> This one patch should really be applied as a bug-fix for v2014.04. It'd be good
>> to get it applied soon.
>>
>> The other large pinmux series I sent can obviously wait until the next release.