linux-kernel - Re: [PATCH 14/18] ARM: mvebu: add support for the Armada 395 SoC family

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Message-ID: <20160725155050.3aee974e@free-electrons.com>
Date:	Mon, 25 Jul 2016 15:50:50 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Rob Herring <robh@...nel.org>
Cc:	Grzegorz Jaszczyk <jaz@...ihalf.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Russell King - ARM Linux <linux@...linux.org.uk>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Marcin Wojtas <mw@...ihalf.com>,
	Lior Amsalem <alior@...vell.com>
Subject: Re: [PATCH 14/18] ARM: mvebu: add support for the Armada 395 SoC
 family

Hello,

On Mon, 25 Jul 2016 08:47:23 -0500, Rob Herring wrote:

> > I am not sure if I get your point. The Armada-398 extends the
> > Armada-395 about 2 additional SATA ports (as you can see in commit
> > "[PATCH 15/18] ARM: mvebu: a398: update the dtsi about missing
> > interfaces"). In this example the a398-db board contains the Armada398
> > SoC, so it is a better match and goes first.  
> 
> But your patch title is adding 395 support, but you are adding the
> string to a 398 based board. It would make sense to have 395 here if
> the OS already had support for 395 and you want to support the 398
> without updating the OS. That doesn't seem to apply here.

I think the argument of Grzegorz is that the 398 is functionally a
strict superset of the 395, so that anything that applies to the 395
will also apply to 398.

Now, whether it is a good idea to consider them "compatible" in the DT
sense, I'm not sure.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com