linux-kernel - Re: [RFC] (early draft) dt: Linux dt usage model documentation

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Date:	Fri, 17 Jun 2011 00:26:01 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	<devicetree-discuss@...ts.ozlabs.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	<linaro-dev@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>
Subject: Re: [RFC] (early draft) dt: Linux dt usage model documentation

On Mon, Jun 13, 2011 at 07:32:15AM -0600, Grant Likely wrote:
[...]
> +About now is a good time to lay out an example.  Here is part of the
> +device tree for the NVIDIA Tegra board.
> +
> +/{
> +	compatible = "nvidia,harmony", "nvidia,tegra250";
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +	interrupt-parent = <&intc>;
> +
> +	chosen { };
> +	aliases { };
> +
> +	memory {
> +		device_type = "memory";
> +		reg = <0x00000000 0x40000000>;
> +	};
> +
> +	soc {
> +		compatible = "nvidia,tegra250-soc", "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		intc: interrupt-controller@...41000 {
> +			compatible = "nvidia,tegra250-gic";
> +			interrupt-controller;
> +			#interrupt-cells = <1>;
> +			reg = <0x50041000 0x1000>, < 0x50040100 0x0100 >;
> +		};
> +
> +		serial@...06300 {
> +			compatible = "nvidia,tegra250-uart";
> +			reg = <0x70006300 0x100>;
> +			interrupts = <122>;
> +		};
> +
> +		i2s-1: i2s@...02800 {

It seem dtc does not compile the label name "i2s-1".  Instead,
"i2s_1" seems good.

> +			compatible = "nvidia,tegra250-i2s";
> +			reg = <0x70002800 0x100>;
> +			interrupts = <77>;
> +			codec = <&wm8903>;
> +		};
> +
> +		i2c@...0c000 {
> +			compatible = "nvidia,tegra250-i2c";
> +			#address-cells = <1>;
> +			#size-cells = <1>;

#size-cells should be 0 ...

> +			reg = <0x7000c000 0x100>;
> +			interrupts = <70>;
> +
> +			wm8903: codec@1a {
> +				compatible = "wlf,wm8903";
> +				reg = <0x1a>;

... Otherwise, reg needs a size here.

> +				interrupts = <347>;
> +			};
> +		};
> +	};
> +
> +	sound {
> +		compatible = "nvidia,harmony-sound";
> +		i2s-controller = <&i2s-1>;
> +		i2s-codec = <&wm8903>;
> +	};
> +};
> +

-- 
Regards,
Shawn

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