linux-kernel - Re: [PATCH] dw_dmac: adjust slave_id accordingly to request line base

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Date:	Wed, 30 Jan 2013 10:07:54 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH] dw_dmac: adjust slave_id accordingly to request line
 base

On Wed, 2013-01-30 at 13:31 +0530, Viresh Kumar wrote: 
> On Wed, Jan 30, 2013 at 1:02 PM, Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > We get a device from the ACPI CSRT table. During enumeration we don't
> > know what kind of the device it is. From the enumeration point of view
> > each device enumerated from CSRT is a platform device (see
> > drivers/acpi/csrt.c for the details).
> >
> > That's why we have to pass this info somehow to the DMAC driver. And
> > like Mika already mentioned we have no other generic way except
> > IORESOURCE_DMA. If you have something better in mind, please share. We
> > could adopt our code then.
> 
> You don't need this in DT case too? 

I think no. It seems the DT has a proper backlink from the slave device
to the dmac ("dma-names" property if I understood it correctly).

> Or only for ACPI case?

ACPI 5 case only until now.
We would like to initiate the proposal to the ACPI specification
team/whoever to have this part designed better in next versions.

> I think "Yes" is the answer of both the questions. If so, then you
> can keep it this way or add another variable in platform data.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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