Re: Moving ARM dts files

From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Andrew Lunn" <andrew@lunn.ch>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"ext Tony Lindgren" <tony@atomide.com>,
	"Liviu Dudau" <liviu.dudau@arm.com>,
	"Masahiro Yamada" <yamada.masahiro@socionext.com>,
	"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
	"Rob Herring" <robh@kernel.org>,
	"Florian Fainelli" <f.fainelli@gmail.com>,
	"Kevin Hilman" <khilman@kernel.org>,
	"Gregory Clement" <gregory.clement@bootlin.com>,
	"Michal Simek" <michal.simek@xilinx.com>,
	"Krzysztof Kozlowski" <krzk@kernel.org>, arm-soc <arm@kernel.org>,
	"Joel Stanley" <joel@jms.id.au>,
	"Andy Gross" <andy.gross@linaro.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	"Jason Cooper" <jason@lakedaemon.net>,
	"Simon Horman" <horms@verge.net.au>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"Maxime Coquelin" <mcoquelin.stm32@gmail.com>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Andreas Färber" <afaerber@suse.de>,
	"Daniel Mack" <daniel@zonque.org>
Subject: Re: Moving ARM dts files
Date: Wed, 5 Dec 2018 08:34:47 +0000	[thread overview]
Message-ID: <20181205162941.2d8bbfaf@xhacker.debian> (raw)
In-Reply-To: <CACRpkdYs_s9m=fUuOcfqcvP5BMXity5GH17RSMyvHzdZ9aFNzA@mail.gmail.com>

On Wed, 5 Dec 2018 09:19:49 +0100 Linus Walleij wrote:

> On Wed, Dec 5, 2018 at 7:02 AM Jisheng Zhang wrote:
> > Rob Herring wrote:  
> 
> > >     'armada' : 'marvell',
> > >     'berlin' : 'marvell',  
> >
> > Now, berlin SoC is synaptics' SoC ;)  
> 
> This illustrates perfectly the artificial nature of using vendor names
> as prefixes with DT properties, prefix names, directories etc.
> 
> Companies start out purporting to be some eternal entity and the
> next day they buy each other left and right and license their
> hardware IP to whoever wants it.
> 
> It actually makes much more sense to organize these files by
> the SoC family name, because that doesn't change when the
> SoC is sold to another company.

If the SoC is sold to another company, then

case1: The original SoC family is renamed to another family.

case2: Based on the original SoC, a newer SoC family comes out.

I'm not sure it's still fine to put the new or renamed SoCs' files into the
original SoC directory.

Another issue is: who will be the maintainer of new or renamed SoC family?

Thanks,
Jisheng

> 
> omap/* containing all OMAP platforms, msm/* for all Qualcomm
> SoCs etc. SoC names/codenames are at least eternal once they
> have been manufactured and we can keep them together
> no matter what vendor currently controls it.
> 
> However I think there was a fork in the road ages ago when
> someone or something decided to use vendor prefixes for
> DT properties leading to this situation that we can no longer
> back out of.
> 
> It has the side effect of splitting DTS files with the same SoC
> in two different folders marvell/* and synaptics/*
> it's a bit meh.
> 
> Yours,
> Linus Walleij

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