linux-kernel - Re: [PATCH v2] ARM: dts: add "simple-bus" where "arm,amba-bus" is used alone

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Date:	Tue, 8 Mar 2016 02:49:27 -0600
From:	Rob Herring <robh+dt@...nel.org>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	"arm@...nel.org" <arm@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Andy Gross <andy.gross@...aro.org>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	David Brown <david.brown@...aro.org>,
	Pawel Moll <pawel.moll@....com>, Wei Xu <xuwei5@...ilicon.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>, linux-soc@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] ARM: dts: add "simple-bus" where "arm,amba-bus" is
 used alone

On Mon, Mar 7, 2016 at 11:46 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> The compatible string "simple-bus" is well defined in ePAPR, while
> I see no documentation for the "arm,amba-bus" in ePAPR or under
> Documentation/devicetree/.
>
> DT is also used by other projects than Linux kernel.  It is not a
> good idea to rely on such an unofficial binding.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
> Changes in v2:
>   - Rephrase the git-log

[...]

> diff --git a/arch/arm/boot/dts/axm55xx.dtsi b/arch/arm/boot/dts/axm55xx.dtsi
> index ea288f0..8da4582 100644
> --- a/arch/arm/boot/dts/axm55xx.dtsi
> +++ b/arch/arm/boot/dts/axm55xx.dtsi
> @@ -107,7 +107,7 @@
>                 };
>
>                 amba {
> -                       compatible = "arm,amba-bus";
> +                       compatible = "arm,amba-bus", "simple-bus";

As I mentioned in the last version, I think you should remove
arm,amba-bus and just have simple-bus. I don't believe anything relies
on having arm,amba-bus.

Rob