linux-kernel - Re: [PATCH v1 1/5] ARM: imx28: add basic dt support

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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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