From: Baruch Siach <baruch@tkos.co.il>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: Jisheng Zhang <jszhang@marvell.com>,
linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i2c: designware: use {readl|writel}_relaxed instead of readl/writel
Date: Tue, 13 Jan 2015 18:28:12 +0200 [thread overview]
Message-ID: <20150113162812.GA2227@tarshish> (raw)
In-Reply-To: <20150113143654.GG7660@katana>
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
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
- baruch@tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
WARNING: multiple messages have this Message-ID (diff)
From: baruch@tkos.co.il (Baruch Siach)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] i2c: designware: use {readl|writel}_relaxed instead of readl/writel
Date: Tue, 13 Jan 2015 18:28:12 +0200 [thread overview]
Message-ID: <20150113162812.GA2227@tarshish> (raw)
In-Reply-To: <20150113143654.GG7660@katana>
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
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
- baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
next prev parent reply other threads:[~2015-01-13 16:28 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-11 6:26 [PATCH] i2c: designware: use {readl|writel}_relaxed instead of readl/writel Jisheng Zhang
2014-12-11 6:26 ` Jisheng Zhang
2014-12-11 6:26 ` Jisheng Zhang
[not found] ` <1418279201-3886-1-git-send-email-jszhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
2014-12-19 2:43 ` Jisheng Zhang
2014-12-19 2:43 ` Jisheng Zhang
2014-12-19 2:43 ` Jisheng Zhang
2015-01-13 11:52 ` Wolfram Sang
2015-01-13 11:52 ` Wolfram Sang
2015-01-13 11:52 ` Wolfram Sang
2015-01-13 14:29 ` Mika Westerberg
2015-01-13 14:29 ` Mika Westerberg
2015-01-13 14:29 ` Mika Westerberg
2015-01-13 14:36 ` Wolfram Sang
2015-01-13 14:36 ` Wolfram Sang
2015-01-13 14:36 ` Wolfram Sang
2015-01-13 16:28 ` Baruch Siach [this message]
2015-01-13 16:28 ` Baruch Siach
2015-01-14 4:05 ` Jisheng Zhang
2015-01-14 4:05 ` Jisheng Zhang
2015-01-14 4:05 ` Jisheng Zhang
2015-01-23 16:09 ` Wolfram Sang
2015-01-23 16:09 ` Wolfram Sang
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