linux-kernel - Re: [PATCH] ARM: dts: add "simple-bus" to "arm, amba-bus" compatible nodes

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Date:	Thu, 3 Mar 2016 14:23:29 -0600
From:	Rob Herring <robh+dt@...nel.org>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
Cc:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	"linux-samsung-soc@...r.kernel.org" 
	<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>,
	"arm@...nel.org" <arm@...nel.org>,
	David Brown <david.brown@...aro.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, Mar 3, 2016 at 4:12 AM, Jon Medhurst (Tixy) <tixy@...aro.org> wrote:
> 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.

If no one notices, then there is no ABI. Things break all the time
when nobody cares. It will be more than a few releases for sure. We
may never get to step 3, but we should do step 1 so people stop
copy-n-pasting this in step 2.

Rob