linux-kernel - Re: [PATCH 1/3] devicetree: bindings: Document qcom board compatible format

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Date:	Fri, 6 Nov 2015 14:15:04 -0600
From:	Andy Gross <agross@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Olof Johansson <olof@...om.net>,
	Kevin Hilman <khilman@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] devicetree: bindings: Document qcom board compatible
 format

On Mon, Oct 26, 2015 at 02:25:10PM -0700, Stephen Boyd wrote:
> Some qcom based bootloaders identify the dtb blob based on a set
> of device properties like SoC, platform, PMIC, and revisions of
> those components. In downstream kernels, these values are added
> to the different component dtsi files (i.e. pmic dtsi file, SoC
> dtsi file, board dtsi file, etc.) via qcom specific DT
> properties. The dtb files are parsed by a program called dtbTool
> that picks out these properties and creates a table of contents
> binary blob with the property information and some offsets into
> the concatenation of all the dtbs (termed a QCDT image).
> 
> The suggestion is to do this via the board compatible string
> instead, because these qcom specific properties are never used by
> the kernel. Add a document describing the format of the
> compatible string that encodes all this information that's
> currently encoded in the qcom,{msm-id,board-id,pmic-id}
> properties in downstream devicetrees. Future bootloaders may be
> updated to look at the compatible field instead of looking for
> the table of contents image. For non-updateable bootloaders, a
> new dtbTool program will parse the compatible string and generate
> a QCDT image from it.
> 
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---

Looks workable.

Reviewed-by: Andy Gross <agross@...eaurora.org>

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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