linux-kernel - Re: [PATCH v4 6/6] ARM: dts: STiH407: Add B2120 board support

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Date:	Tue, 20 May 2014 08:43:53 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Olof Johansson <olof@...om.net>
Cc:	Maxime COQUELIN <maxime.coquelin@...com>,
	Rob Landley <rob@...dley.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Srinivas Kandagatla <srinivas.kandagatla@...com>,
	Stuart Menefy <stuart.menefy@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...inux.com" <kernel@...inux.com>
Subject: Re: [PATCH v4 6/6] ARM: dts: STiH407: Add B2120 board support

> >> > +       soc {
> >> > +               sbc_serial0: serial@...0000 {
> >> > +                       status = "okay";
> >> > +               };
> >>
> >> You might want to consider reference-based syntax here instead, so you
> >> don't have to mimic the hierarchy. That'd be (at the root level of the
> >> file, below this secion:
> >>
> >> &sbc_serial0: {
> >>         status = "okay";
> >> };
> >
> > I'm personally not keen on this scheme.  It's sometimes helpful to know
> > the hierarchy and I don't think it's a large overhead to format the
> > subordinate DTS files in this way.
> >
> > Please consider not enforcing this.
> 
> Definitely not enforcing it, and I didn't use to like it either but it
> has some real upsides.
> 
> In particular, it saves a lot of grief when you're changing something
> like the unit-id of a node in .dtsi and forget to do the same update
> in the dts.

I'm not entirely sure what a unit-id is, but I can see that there
would be benefits to using the referenced-based syntax as you call
it.  If any of those benefits hold true here I won't push back, but I
would personally like to see us default to the hierarchical scheme.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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