linux-kernel - Re: [PATCH v2 1/3] devicetree: bindings: Document qcom,msm-id and qcom,board-id

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Message-ID: <7229476.C4So9noUlf@wuerfel>
Date:	Wed, 11 Mar 2015 22:48:13 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	Bjorn Andersson <bjorn@...o.se>, Olof Johansson <olof@...om.net>,
	Kevin Hilman <khilman@...nel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Heiko Stübner <heiko@...ech.de>
Subject: Re: [PATCH v2 1/3] devicetree: bindings: Document qcom,msm-id and qcom,board-id

On Wednesday 11 March 2015 15:35:22 Kumar Gala wrote:
> On Mar 11, 2015, at 3:20 PM, Arnd Bergmann <arnd@...db.de> wrote:
> 
> > On Wednesday 11 March 2015 08:33:04 Bjorn Andersson wrote:
> >> 
> >> But are these values actually used by the boot loader?
> >> 
> >> As far as I could see in 8974 the dtbTool provided by Qualcomm
> >> extracts the values from the list of dtbs and use them to create the
> >> table-of-content in the QCDT blob. The boot loader then looks in this
> >> TOC to pick the right dtb to use.
> >> 
> > 
> > I guess if I understand this right, we just need to fix that dtbTool
> > then to look at the top-level compatible property and/or machine
> > name instead?
> > 
> >       Arnd
> 
> Correct, and it means updating the tool for every board/dts that gets created in the future.
> 
> Thus, the feeling was that having the ids kept with the dtb made maintenance far easier.
> 

Part of my objection was to having nonstandard properties that are
not even used anywhere in the kernel. If you could just encode
them in the root compatible property as a string, that would be
a lot nicer.

	Arnd
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