Re: [PATCH v2 1/5] devicetree: bindings: Document qcom board compatible format

From: Stephen Boyd
Date: Mon Nov 23 2015 - 19:47:30 EST

On 11/22, Rob Herring wrote:
> On Fri, Nov 20, 2015 at 03:31:16PM -0800, 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@xxxxxxxxxxxxxx>
> Much more reasonable now. I do find the '/' in it a bit strange though.

I can remove the backslash if you like. Is a dash more preferred?

> Acked-by: Rob Herring <robh@xxxxxxxxxx>

and if so can I keep the ack? I'll resend with that change and
add the ack.

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