linux-kernel - Re: [PATCH 1/3] i2c: append hardware lock with bus lock

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Message-ID: <20110502114616.7813da79@endymion.delvare>
Date:	Mon, 2 May 2011 11:46:16 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Ben Dooks <ben-i2c@...ff.org>
Cc:	Haojian Zhuang <haojian.zhuang@...il.com>, eric.y.miao@...il.com,
	ben-linux@...ff.org, linux-i2c@...r.kernel.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Haojian Zhuang <haojian.zhuang@...vell.com>
Subject: Re: [PATCH 1/3] i2c: append hardware lock with bus lock

On Mon, 2 May 2011 10:27:34 +0100, Ben Dooks wrote:
> On Thu, Apr 28, 2011 at 11:15:44PM +0800, Haojian Zhuang wrote:
> > Both AP and CP are contained in Marvell PXA910 silicon. These two ARM
> > cores are sharing one pair of I2C pins.
> > 
> > In order to keep I2C transaction operated with atomic, hardware lock
> > (RIPC) is required. Because of this, bus lock in AP side can't afford
> > this requirement. Now hardware lock is appended.
> > 
> > Signed-off-by: Haojian Zhuang <haojian.zhuang@...vell.com>
> > Cc: Ben Dooks <ben-linux@...ff.org>
> > Cc: Jean Delvare <khali@...ux-fr.org>
> 
> Right, this looks like a reasonable explanation of what is going on here
> and if Jean is happy with the core changes I'll look at where the driver
> change can go.

Yes I am!

Let me know if you want me to take the core change in my tree or if you
prefer to have it in yours to avoid a dependency.

-- 
Jean Delvare
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