linux-kernel - Re: [PATCH v4 6/6] ARM: zynq: DT: Add OCM controller node

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Date:	Mon, 17 Nov 2014 09:00:02 +1000
From:	Peter Crosthwaite <peter.crosthwaite@...inx.com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Andreas Färber <afaerber@...e.de>,
	Michal Simek <michal.simek@...inx.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Josh Cartwright <josh.cartwright@...com>,
	Michal Simek <monstr@...str.eu>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>
Subject: Re: [PATCH v4 6/6] ARM: zynq: DT: Add OCM controller node

On Mon, Nov 17, 2014 at 5:32 AM, Sören Brinkmann
<soren.brinkmann@...inx.com> wrote:
> On Sun, 2014-11-16 at 11:51AM +0100, Andreas Färber wrote:
>> Hi Michal,
>>
>> Am 14.11.2014 um 11:52 schrieb Michal Simek:
>> > diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
>> > index ce2ef5bec4f2..e217fb1c1169 100644
>> > --- a/arch/arm/boot/dts/zynq-7000.dtsi
>> > +++ b/arch/arm/boot/dts/zynq-7000.dtsi
>> > @@ -150,6 +150,13 @@
>> >                     reg = <0xf8006000 0x1000>;
>> >             };
>> >
>> > +           ocmc: memory-controller@...0c000 {
>> > +                   compatible = "xlnx,zynq-ocmc-1.0";
>> > +                   interrupt-parent = <&intc>;
>> > +                   interrupts = <0 3 4>;
>> > +                   reg = <0xf800c000 0x1000>;
>> > +           };
>> > +
>> >             uart0: serial@...00000 {
>> >                     compatible = "xlnx,xuartps", "cdns,uart-r1p8";
>> >                     status = "disabled";
>>
>> Not directly related to this patch: As one can see here, the node order
>> is quite a mess... According to Olof, nodes should be ordered by unit
>> address, whereas here some but not all seem ordered by node name. Would
>> you welcome a cleanup patch, or can you fix that yourself?
>
> I wouldn't say it's a mess, just a different property to sort the nodes
> by. For humans reading the DT, searching for nodes, alphabetical order
> helps finding the right node, IMHO.

I do generally find myself asking "whats that thing at that address"
more than I find myself asking the "wheres that piece of hardware" so
Andreas' sorting scheme makes more sense to me. Vertically scanning a
DT to give yourself an overview of the system level address map is
good too. Wheras alphabetic sorting doesn't mean to much.

Regards,
Peter

What advantage would sorting by
> address have?
>
>         Thanks,
>         Sören
> --
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