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

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Message-ID: <20120314054116.GD21337@S2101-09.ap.freescale.net>
Date:	Wed, 14 Mar 2012 13:41:20 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Dong Aisheng <b29396@...escale.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	s.hauer@...gutronix.de, shawn.guo@...escale.com,
	kernel@...gutronix.de, rob.herring@...xeda.com, cjb@...top.org,
	rdunlap@...otime.net, vinod.koul@...ux.intel.com
Subject: Re: [PATCH v1 1/5] ARM: imx28: add basic dt support

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.

-- 
Regards,
Shawn
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