linux-kernel - Re: [PATCHv2] DMAEngine: Let dmac drivers to set chan

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Message-ID: <CAJe_ZhdYg4EpaNbBW+dayjSORqM=E6myT3oOG5VTsiQnh3erTA@mail.gmail.com>
Date:	Sat, 23 Jul 2011 09:26:25 +0530
From:	Jaswinder Singh <jaswinder.singh@...aro.org>
To:	"Williams, Dan J" <dan.j.williams@...el.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, vinod.koul@...el.com,
	rmk+kernel@....linux.org.uk, linus.walleij@...ricsson.com,
	per.friden@...ricsson.com, wei.zhang@...escale.com,
	ebony.zhu@...escale.com, iws@...o.caltech.edu,
	s.hauer@...gutronix.de, maciej.sosnowski@...el.com,
	saeed@...vell.com, shawn.guo@...escale.com, yur@...raft.com,
	agust@...x.de, iwamatsu.nobuhiro@...esas.com,
	per.forlin@...ricsson.com, jonas.aberg@...ricsson.com,
	anemo@....ocn.ne.jp
Subject: Re: [PATCHv2] DMAEngine: Let dmac drivers to set chan_id

On 23 July 2011 03:53, Williams, Dan J <dan.j.williams@...el.com> wrote:

>
> Unless you guaranteed that every id is globally unique I don't see how
> they are generically usable by common clients?
>
Yes. And the first step is to allow DMAC drivers to freely set chan_id value.
Platform could pass the list and mapping of supported 'global channels'
via platform_data(?) which the DMAC drivers could set in chan_id
And I am not sure of defining a new variable for that, because chan_id
is actually used only by some dmac drivers for internal purpose only -
which they could do by private variables.

Proposal to have global cross-platform enum of channel-IDs defined by
client drivers, was to be my next patch.
Though I think, this patch is valid in it's own light.

-j

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