linux-kernel - Re: [PATCH V2 1/3] i2c: busses: add SLIMpro I2C device driver on APM X-Gene platform

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Message-ID: <20150403182138.GB1298@katana>
Date:	Fri, 3 Apr 2015 20:21:38 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Feng Kan <fkan@....com>
Cc:	patches <patches@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-i2c@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, Hieu Le <hnle@....com>
Subject: Re: [PATCH V2 1/3] i2c: busses: add SLIMpro I2C device driver on APM
 X-Gene platform

> >> +     paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen,
> >> +                            DMA_FROM_DEVICE);
> >
> > The device should be the device of the dma channel.
> 
> The device is not visible on linux, DMA is done by the helper processor.
> Perhaps you cah give me some idea how to do this. Thanks

Well, that is a question for the DMA maintainers. But we can fix this
later, I guess.


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