linux-kernel - Re: [PATCH 02/13] dmaengine: Introduce dma_request_slave_channel_compat

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Date:	Fri, 20 Nov 2015 16:08:47 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Arnd Bergmann <arnd@...db.de>, Vinod Koul <vinod.koul@...el.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Tony Lindgren <tony@...mide.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine <dmaengine@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	linux-crypto <linux-crypto@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	ALSA Development Mailing List <alsa-devel@...a-project.org>
Subject: Re: [PATCH 02/13] dmaengine: Introduce dma_request_slave_channel_compat_reason()

On Fri, Nov 20, 2015 at 2:30 PM, Peter Ujfalusi <peter.ujfalusi@...com> wrote:
> On 11/20/2015 02:24 PM, Andy Shevchenko wrote:
>> On Fri, Nov 20, 2015 at 12:58 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>> On Friday 20 November 2015 12:25:06 Peter Ujfalusi wrote:
>>>> On 11/19/2015 01:25 PM, Arnd Bergmann wrote:
>>
>>> Another idea would be to remove the filter function from struct dma_chan_map
>>> and pass the map through platform data
>>
>> Why not unified device properties?
>
> Is this some Windows/ACPI feature?

Nope.

Check drivers/base/property.c

> Quick search gives mostly MSDN and
> Windows10 related links.
>
> We only need dma_chan_map for platforms which has not been converted to DT and
> still using legacy boot. Or platforms which can still boot in legacy mode. In
> DT/ACPI mode we do not need this map at all.


-- 
With Best Regards,
Andy Shevchenko
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