linux-kernel - Re: [PATCH V2 2/2] dmaengine: Add driver for IMG MDC

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Date:	Sun, 7 Dec 2014 22:14:05 -0800
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	James Hartley <james.hartley@...tec.com>,
	James Hogan <james.hogan@...tec.com>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>,
	Damien Horsley <Damien.Horsley@...tec.com>,
	Arnd Bergmann <arnd@...db.de>, dmaengine@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/2] dmaengine: Add driver for IMG MDC

On Sun, Dec 7, 2014 at 3:48 AM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Fri, Dec 05, 2014 at 10:30:53AM -0800, Andrew Bresticker wrote:
>> After adding a macro for setting the WIDTH_{R,W} fields it seems fine
>> to me.  Is there something else you had in mind?
> I think whole of this might be a macro :)
>
>
>> > and this depends on dma_slave_config being set, which shouldn't be the case
>> > for memcpy

> okay looking back yes it depends on bus_width. But how is bus_width set, i
> thought the dma_slave_config will set that?

The MDC's memory bus width is read from a HW register and set in probe().
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