linux-kernel - Re: [PATCH v2 2/5] ARM: zynq: dt: Convert to preprocessor includes

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Date:	Mon, 7 Apr 2014 08:39:34 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Mike Looijmans <mike.looijmans@...ic.nl>
CC:	<monstr@...str.eu>, 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>,
	Michal Simek <michal.simek@...inx.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>
Subject: Re: [PATCH v2 2/5] ARM: zynq: dt: Convert to preprocessor includes

On Mon, 2014-04-07 at 02:17PM +0200, Mike Looijmans wrote:
> On 04/07/2014 07:58 AM, Michal Simek wrote:
> >Hi Soren,
> >
> >On 04/05/2014 01:14 AM, Soren Brinkmann wrote:
> >>Convert all Zynq DT files to the dtc preprocessor include syntax.
> >>This allows to include header files in the devicetrees like other
> >>SoC-types already do.
> >>
> >>Inspired-by: Steffen Trumtrar <s.trumtrar@...gutronix.de>
> >>(http://www.spinics.net/lists/arm-kernel/msg319832.html)
> >>
> >>Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> >
> >These 4 patches needs more wider discussion if this is helpful or
> >not. Currently I can't see any value in it because everything
> >is just generated and fixed. I think I had the same discussion
> >with Laurent some weeks ago regarding this.
> 
> I would be kinda neutral here. I'd consider it helpful, it improves
> readability (regardless of whether they are generated or hand
> crafted). That's convenient for things like interrupt sensitivity, I
> can't remember whether 4 is level or edge type. On the other hand,
> the clock indices are just as much magic numbers as the memory
> addresses. If I suspect an error in that area, I'd start by lokking
> in /sys/kernel/debug/clk but wouldn't start in the DT.

I agree. Readability is better this way. And whether our generator spits
out magic numbers of these symbolic names should not be a big
difference, is it?

	Sören


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