linux-kernel - Re: [PATCH v2] ARM: dts: zynq: Add OCM node

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Message-ID: <5c1602f83c594a72aac78c245f1830fa@BL2FFO11FD052.protection.gbl>
Date:	Thu, 12 Feb 2015 06:58:36 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Michal Simek <michal.simek@...inx.com>
CC:	Mark Rutland <mark.rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"monstr@...str.eu" <monstr@...str.eu>,
	Andreas Färber <afaerber@...e.de>,
	Russell King <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Rob Herring <robherring2@...il.com>,
	Josh Cartwright <josh.cartwright@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] ARM: dts: zynq: Add OCM node

On Thu, 2015-02-12 at 12:01PM +0100, Michal Simek wrote:
> On 02/12/2015 11:54 AM, Mark Rutland wrote:
> > On Thu, Feb 12, 2015 at 10:42:47AM +0000, Michal Simek wrote:
> >> Add OCM node for all zynq boards. OCM location
> >> can changed but for all current boards this
> >> is the location where OCM is.`
> >>
> >> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> >> ---
> >>
> >> Changes in v2:
> >> - Move node to board file suggested by Mark
> >>
> >> This patch is done based on discussion here.
> >> https://lkml.org/lkml/2014/12/1/396
> >>
> >> Mark: I expect you won't like amba bus reference or
> >> am I wrong?
> > 
> > I'm fine with dropping things onto a bus in this way. If we're happy to
> > do it for other nodes I don't see why busses should be special.
> 
> Wonderful. I will give people some time to comment this style.

Given that the location is discoverable, wouldn't it make sense to let
'reg' point to the ctrl/cfg registers in the SLCR and let the driver
handle the whereabouts of the OCM location? (but I guess this is going
in circles now, such a proposal was on the table at some point, IIRC).
But I'd prefer:
	memory-controller@...ffc0000 { /* the address here would of course not match all configurations */
		interrupts = ...;
		syscon = &slcr;
	};

	Soren
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