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

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Date:	Fri, 22 Aug 2014 09:31:20 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.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, 2014-08-22 at 10:20AM -0600, Jason Gunthorpe wrote:
> On Thu, Aug 21, 2014 at 08:49:19AM -0700, Sören Brinkmann wrote:
> 
> > So my thinkings:
> >  - the compatible string with the -c22 is used and documented in the phy
> >    bindings, it should be there.
> 
> Yes
> 
> >  - the ID based strings seem to be not needed since, IIUC, the core
> >    reads the ID from the PHY and uses it, so I just left it out not
> >    trying to figure out how to obtain the correct ID
> 
> It is certainly optional, I added the property to solve some obscure
> problems with probing, but I've noticed people using it more broadly.
> I suspect it also speeds up booting a tiny bit.
> 
> >  - 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.

	Sören

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