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Message-Id: <201203140656.24301.marek.vasut@gmail.com>
Date: Wed, 14 Mar 2012 06:56:23 +0100
From: Marek Vasut <marek.vasut@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Shawn Guo <shawn.guo@...aro.org>,
Grant Likely <grant.likely@...retlab.ca>,
vinod.koul@...ux.intel.com, devicetree-discuss@...ts.ozlabs.org,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
rob.herring@...xeda.com, rdunlap@...otime.net,
shawn.guo@...escale.com, kernel@...gutronix.de, cjb@...top.org,
Dong Aisheng <b29396@...escale.com>, s.hauer@...gutronix.de
Subject: Re: [PATCH v1 1/5] ARM: imx28: add basic dt support
Dear Shawn Guo,
> On Tue, Mar 13, 2012 at 11:23:51AM -0600, Grant Likely wrote:
> ...
>
> > > + apb@...00000 {
> > > + compatible = "simple-bus";
> > > + #address-cells = <1>;
> > > + #size-cells = <1>;
> > > + reg = <0x80000000 0x80000>;
> > > + ranges;
> > > +
> > > + apbh@...00000 {
> > > + compatible = "simple-bus";
> > > + #address-cells = <1>;
> > > + #size-cells = <1>;
> > > + reg = <0x80000000 0x3c900>;
> > > + ranges;
> > > +
> > > + icoll: interrupt-controller@...00000 {
> > > + compatible = "fsl,imx28-icoll";
> > > + interrupt-controller;
> > > + #interrupt-cells = <1>;
> > > + reg = <0x80000000 0x2000>;
> > > + };
> > > + };
> > > +
> > > + apbx@...40000 {
> > > + compatible = "simple-bus";
> > > + #address-cells = <1>;
> > > + #size-cells = <1>;
> > > + reg = <0x80040000 0x40000>;
> > > + ranges;
> > > +
> > > + uart1: uart@...74000 {
> > > + compatible = "arm,pl011", "arm,primecell";
> > > + reg = <0x80074000 0x2000>;
> > > + interrupts = <47>;
> > > + };
> > > + };
> >
> > What is the purpose of the apbh and apbx busses? Will more device nodes
> > get added to them later, or does each only contain a single device?
>
> Since our ultimate goal is to convert mach-mxs over to device tree,
> I would also suggest we have all the hardware blocks defined in dts
> from the beginning.
Agreed.
Best regards,
Marek Vasut
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