linux-kernel - Re: [PATCH v4 1/8] arm64: dts: rockchip: Clean up /memory nodes

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Date:	Thu, 31 Mar 2016 22:45:52 +0200
From:	Heiko Stuebner <heiko@...ech.de>
To:	Andreas Färber <afaerber@...e.de>
Cc:	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	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>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 1/8] arm64: dts: rockchip: Clean up /memory nodes

Am Donnerstag, 31. März 2016, 19:15:43 schrieb Heiko Stuebner:
> Am Samstag, 19. März 2016, 09:04:08 schrieb Heiko Stuebner:
> > Am Mittwoch, 16. März 2016, 14:58:39 schrieb Andreas Färber:
> > > A dtc update results in warnings for nodes with reg property but
> > > without
> > > unit address in the node name, so rename /memory to /memory@0.
> > > 
> > > Signed-off-by: Andreas Färber <afaerber@...e.de>
> > 
> > applied to a dts64-fixes branch for 4.6, after changing the commit
> > message to ----
> > A dtc update results in warnings for nodes with reg property but without
> > unit address in the node name, so rename /memory to /memory@...rtaddress
> > (memory starts at 0 in the case of the rk3368).
> > ----
> > 
> > To clarify that the @0 is not arbitary chosen.
> 
> This dtc update in question hasn't landed in v4.6-rc1 and from what I
> gathered will need some changes. The patch is obviously still correct, but
> I have now moved it from v4.6-fixes to the regular v4.7 64bit dts
> changes.

also it seems "memory" is special and memory without unitname will stay 
allowed [0], especially as uboot or other bootloaders may expect such a node 
to insert the actual amount of memory into it.

Looking at uboot, fdt_fixup_memory_banks seems to look explicitly for a 
"memory" node, so I'm actually not sure, if this is safe to keep at all.


[0] http://www.spinics.net/lists/arm-kernel/msg494038.html