linux-kernel - Re: [PATCH 1/5 v2] dmaengine: ste_dma40: Allow memcpy channels to be configured from DT

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Message-ID: <20130503121135.GK24153@gmail.com>
Date:	Fri, 3 May 2013 13:11:35 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Per Forlin <per.forlin@...ricsson.com>,
	Rabin Vincent <rabin@....in>
Subject: Re: [PATCH 1/5 v2] dmaengine: ste_dma40: Allow memcpy channels to be
 configured from DT

On Fri, 03 May 2013, Linus Walleij wrote:

> On Fri, May 3, 2013 at 1:57 PM, Lee Jones <lee.jones@...aro.org> wrote:
> > On Fri, 03 May 2013, Linus Walleij wrote:
> >
> >> On Wed, May 1, 2013 at 11:52 AM, Lee Jones <lee.jones@...aro.org> wrote:
> >>
> >> > At this moment in time the memcpy channels which can be used by the D40
> >> > are fixed, as each supported platform in Mainline uses the same ones.
> >> > However, platforms do exist which don't follow this convention, so
> >> > these will need to be tailored. Fortunately, these platforms will be DT
> >> > only, so this change has very little impact on platform data.
> >> >
> >> > Cc: Vinod Koul <vinod.koul@...el.com>
> >> > Cc: Dan Williams <djbw@...com>
> >> > Cc: Per Forlin <per.forlin@...ricsson.com>
> >> > Cc: Rabin Vincent <rabin@....in>
> >> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> >>
> >> Real nice!
> >>
> >> But can you split this in two patches: one that changes
> >> drivers/dma/ste_dma40* and one sequel patch that changes
> >> Documentation/* and arch/arm/boot/dts/* so I can merge them
> >> out-of-order?
> >>
> >> I am trying this development cycle to split changes to the
> >> device trees and bindings off from the rest of the patches
> >> becaused it caused me a mess last cycle.
> >
> > I was under the impression that the documentation went with the
> > bindings, rather than the Device Tree. Am I wrong?
> 
> No you're right. The documentation with the bindings and the
> patch to the driver...
> 
> Then just arch/arm/boot/dts/* separately.

I'm confused, that's how it is already:

  Documentation/devicetree/bindings/dma/ste-dma40.txt |    2 ++
  drivers/dma/ste_dma40.c                             |   42 +++++++++++++++++++++++++++++++++---------
  include/linux/platform_data/dma-ste-dma40.h         |    2 ++
  3 files changed, 37 insertions(+), 9 deletions(-)

Are you getting enough sleep? ;)

> The latter is where I have all my trouble and screwup...
> 
> (However when we break the devicetree data out of the kernel
> and into its own git we will have to follow the pattern above with
> a patch of bindings+DT changes and another one in parallell
> changing the kernel, but that is for a more advanced age.)
> 
> Yours,
> Linus Walleij

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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