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Date:	Wed, 19 Dec 2012 16:17:03 -0800
From:	Simon Glass <>
To:	Mark Brown <>
Cc:	Grant Likely <>,
	Naveen Krishna Chatradhi <>,
	"" <>,
	lk <>,,
	Wolfram Sang <>,,
	Ben Dooks <>,
	Devicetree Discuss <>,
	Grant Grundler <>,
	Naveen Krishna <>
Subject: Re: [PATCH 1/2] i2c-core: Add gpio based bus arbitration implementation

On Wed, Dec 19, 2012 at 9:14 AM, Mark Brown
<> wrote:
> On Wed, Dec 19, 2012 at 12:32:01PM +0000, Grant Likely wrote:
>> I'm not convinced on the design of this protocol. It won't scale beyond
>> 2 bus masters and it seems very specific to the design of a specific
>> piece of hardware. I don't think it is mature enough to bake into the
> I ought to point out that the original patch would've baked this into
> the Samsung I2C driver but I asked for it to be split out as it's
> nothing to do with the controller really and I'm sure I've seen it
> before.

Grant your idea looks nice to me. I only worry if we should wait until
we have a second user before going so far with it. But it is certainly
a nice general solution.

The scaling beyond two bus masters would require the code to be
changed to check more input lines from other masters. Best avoided for
now I think until we have a use for it.

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