linux-kernel - Re: [PATCH] i2c: designware: use {readl|writel}

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Date:	Tue, 13 Jan 2015 18:28:12 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Jisheng Zhang <jszhang@...vell.com>, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: designware: use {readl|writel}_relaxed instead of
 readl/writel

Hi Wolfram,

On Tue, Jan 13, 2015 at 03:36:54PM +0100, Wolfram Sang wrote:
> > The driver does not perform DMA, so it's safe to use the relaxed version.
> > From another side, the relaxed io accessor macros are available on all
> > architectures now, so we can use the relaxed versions instead.
> 
> Can the designware core make use of DMA in theory?

According to the "DesignWare DW_apb_i2c Databook" version I have it can 
(optionally).

baruch

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