linux-kernel - Re: [PATCH v3 08/15] dmaengine: dw: revisit data

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Message-ID: <1460724334.6620.189.camel@linux.intel.com>
Date:	Fri, 15 Apr 2016 15:45:34 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Viresh Kumar <vireshk@...nel.org>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Tejun Heo <tj@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Rutland <mark.rutland@....com>,
	Vineet Gupta <vgupta@...opsys.com>
Subject: Re: [PATCH v3 08/15] dmaengine: dw: revisit data_width property

On Wed, 2016-04-13 at 17:40 +0100, Mark Brown wrote:
> On Wed, Apr 13, 2016 at 07:21:53PM +0300, Andy Shevchenko wrote:
> > 
> > On Wed, 2016-04-13 at 21:47 +0530, Vinod Koul wrote:
> > > 
> > > On Wed, Apr 13, 2016 at 07:05:48PM +0300, Andy Shevchenko wrote:
> > 
> > > 
> > > > 
> > > > The old is still supported and benefit is apparently in unifying
> > > > standard properties across the drivers.
> > 
> > > 
> > > Hrmmm how is that?
> > 
> > The common usage for data-width property is "in bytes". And I like
> > the
> > idea. I don't know why at all I chose to keep encoded value there in
> > the
> > first place and no one commented at that time. I suppose because of
> > screwed device tree process. I think now it's better to follow some
> > standard / registered properties in new drivers.
> You're unfortunately still breaking compatibility with existing DTs
> using this property.  Now, it does appear that there is very little
> use
> of this DMA controller on DT systems and judging by the somewhat odd
> compatible string and in tree DTs most of those are legacy so perhaps
> this isn't the end of the world but this isn't something that should
> be
> dismissed as a simple cleanup.

Well, does everyone agree that keeping data-width a) with dash in the
name and b) in bytes is good approach?

I will keep an array and support for old encoded property though.

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