linux-kernel - Re: [patch 2/7] dt: dtb version: document chosen/dtb-info node binding

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Message-ID: <550B0944.6080203@gmail.com>
Date:	Thu, 19 Mar 2015 10:37:08 -0700
From:	Frank Rowand <frowand.list@...il.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Michal Marek <mmarek@...e.cz>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kbuild@...r.kernel.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2/7] dt: dtb version: document chosen/dtb-info node binding

On 3/18/2015 8:33 PM, Frank Rowand wrote:
> From: Frank Rowand <frank.rowand@...ymobile.com>
> 
> Add /chosen/dtb-node binding.
> 
> Signed-off-by: Frank Rowand <frank.rowand@...ymobile.com>
> ---
>  Documentation/devicetree/bindings/chosen.txt |   37 +++++++++++
> 
> Index: b/Documentation/devicetree/bindings/chosen.txt
> ===================================================================
> --- a/Documentation/devicetree/bindings/chosen.txt
> +++ b/Documentation/devicetree/bindings/chosen.txt
> @@ -46,6 +46,43 @@ on PowerPC "stdout" if "stdout-path" is
>  should only use the "stdout-path" property.
>  
>  
> +dtb-info node
> +----------------
> +
> +Information that describes where the device tree blob (DTB) came from and the
> +environment it was created in.

I left out optional vs required.  The next version will state that the dtb-info
node and each separate property within it are optional.

> +
> +This node is normally created by including arch/arm/boot/dts/skeleton.dtsi,
> +which includes include/dt-bindings/version.dtsi.
> +
> +Properties:
> +
> +version
> +	The version of the DTB.  This is analagous to the linux kernel version.
> +
> +	This is a format free field intended for human consumption.  User space
> +	programs should not have any expections about this property.
> +
> +	The DTB number in this property is incremented each time a make that
> +	creates one or more DTBs is invoked.  If the make creates multiple
> +	DTBs then this number is only incremented once.
> +
> +	The DTB number is stored in file .version_dtb.
> +
> +version-linux
> +	The version of the linux kernel most recently built in the source
> +	control system that contains the source used to build the DTB.
> +
> +	The linux kernel version number is not incremented for a make that
> +	creates a DTB.
> +
> +dtb-path
> +	The build directory relative path of the DTB.
> +
> +dts-path
> +	The absolute path of the .dts file compiled to create the DTB.
> +
> +
>  Properties documented in other bindings
>  ---------------------------------------
>  #address-cells                          video/simple-framebuffer-sunxi.txt
> 

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