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Date: Thu, 03 Mar 2016 10:12:55 +0000
From: "Jon Medhurst (Tixy)" <tixy@...aro.org>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
linux-samsung-soc@...r.kernel.org,
Russell King <linux@....linux.org.uk>,
Heiko Stuebner <heiko@...ech.de>,
Pawel Moll <pawel.moll@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Wei Xu <xuwei5@...ilicon.com>,
David Brown <david.brown@...aro.org>, arm@...nel.org,
Kukjin Kim <kgene@...nel.org>,
Kumar Gala <galak@...eaurora.org>,
Andy Gross <andy.gross@...aro.org>,
"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
Dinh Nguyen <dinguyen@...nsource.altera.com>,
linux-soc@...r.kernel.org,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: dts: add "simple-bus" to "arm, amba-bus"
compatible nodes
On Thu, 2016-03-03 at 12:07 +0900, Masahiro Yamada wrote:
[...]
> This patch is derived from Rob Herring' comment
> "BTW, we should also kill off "amba-bus" which is an ambiguous term"
> in the following thread:
> http://lkml.iu.edu/hypermail/linux/kernel/1601.0/01822.html
>
>
> So, the plan would be like this:
>
> [1] Make device trees not depend on "arm,amba-bus" (this commit)
> [2] New device trees should no longer use "arm,amba-bus" alone.
> [3] Go though some releases until we do not care about the backward
> compatibility
Why would we stop caring about backwards compatibility? If I was a user
of any of the platforms in question and updated my kernel, I wouldn't
expect to have to debug why it was broken, then install a new dtb to fix
it - which may be a tricky thing to do, depending on the firmware used
to boot Linux.
> [4] Drop "arm,amba-bus" from of_default_bus_match_table
--
Tixy
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