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Date: Mon, 2 Feb 2015 14:15:44 -0800
Message-ID: <CAL85gmD+0cJfZoWo8ujmjwy9yaKjNPjJaUm00Vrv5o9kcg-ozA@mail.gmail.com>
Subject: Re: [PATCH 4/6] i2c: busses: add SLIMpro I2C device driver on APM
 X-Gene platform
From: Feng Kan <fkan@apm.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: Arnd Bergmann <arnd@arndb.de>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        patches <patches@apm.com>, linux-i2c@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Hieu Le <hnle@apm.com>
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On Thu, Jan 29, 2015 at 10:11 PM, Wolfram Sang <wsa@the-dreams.de> wrote:
>
>> > ctx->dev is probably the wrong device here. The i2c controller is not
>> > DMA capable itself, you need to have a pointer to the device that actually
>> > performs the DMA here.
>>
>> Arnd, I do agree this may not be the best identification. There is no
>> representation for this on the Linux side. I could put it as NULL. However,
>> there are other i2c bus drivers that seem to do the same thing. Please
>> let me know what you think.
>
> For completeness: Those drivers need fixing!
I have some doubts. I could hack up a dts node for the helper
processor that is doing the dma. However, the dma master could be
anything for that matter. I am not sure how I can write this in a
generic manner.
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