linux-kernel - Re: [PATCH 04/18] dmaengine/amba-pl08x: Remove redundant comment and rewrite original

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Message-ID: <20110730225708.GB17570@n2100.arm.linux.org.uk>
Date:	Sat, 30 Jul 2011 23:57:08 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	viresh kumar <viresh.linux@...il.com>,
	"Koul, Vinod" <vinod.koul@...el.com>, pratyush.anand@...com,
	rajeev-dlh.kumar@...com, bhupesh.sharma@...com,
	armando.visconti@...com, linux-kernel@...r.kernel.org,
	vipin.kumar@...com, shiraz.hashim@...com, amit.virdi@...com,
	vipulkumar.samar@...com, deepak.sikri@...com,
	dan.j.williams@...el.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 04/18] dmaengine/amba-pl08x: Remove redundant comment
	and rewrite original

On Sun, Jul 31, 2011 at 12:32:55AM +0200, Linus Walleij wrote:
> 2011/7/29 viresh kumar <viresh.linux@...il.com>:
> > Nor mine either. :)
> >
> > Will give some more explanation.
> >
> > But before that i wanted to know the exact purpose of this
> > master-slave concept here.
> 
> The PL08x has two bus mastering interfaces. They can be
> connected to two separate busses and two adress spaces
> even, usually that is not the case though.

This is not what the function is about... that's done by my
pl08x_select_bus() function.

This function (pl08x_choose_master_bus) does something completely
different, and has to do with how the LLIs are laid out.  I think
it's to do with whether we use the source or destination for
alignment purposes.

It really has nothing to do with choosing busses.
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