linux-kernel - Re: [PATCH 3/3] ARM: zynq: DT: Add Ethernet phys

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Date:	Fri, 22 Aug 2014 10:48:25 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Andreas Färber <afaerber@...e.de>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3] ARM: zynq: DT: Add Ethernet phys

On Fri, Aug 22, 2014 at 09:31:20AM -0700, Sören Brinkmann wrote:

> > >  - the marvell compatible strings are used in our vendor tree. They
> > >    aren't used anywhere but in our vendor tree. I though keeping them is
> > >    nice since it identifies the PHY fully. And in case that level of
> > >    detail is needed at some point it is already there.
> > 
> > DT is complex enough already, don't include useless compatible strings
> > in mainline - people will see and tend to blindly copy. Ideally your
> > vendor tree would use the standard property :|
> 
> There are different opinions on this. I also heard to just add such
> strings, so in case this level of differentiation becomes necessary at
> some later point, it is already existing.

In some cases, yes, and they should be docuemented in the binding, of
course.

But there is already a standard compatible string format to uniquely
identify a phy, so in this case another string is not justified, and
just creates confusion about what is correct.

Jason
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