From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH] of/platform: export of_default_bus_match_table
Date: Tue, 05 Jan 2016 12:48:29 +0100
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To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: devicetree@vger.kernel.org, Paul Gortmaker <paul.gortmaker@windriver.com>, Olof Johansson <olof@lixom.net>, Frank Rowand <frowand.list@gmail.com>, Rob Herring <robh+dt@kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Grant Likely <grant.likely@linaro.org>
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On Tuesday 05 January 2016 19:50:31 Masahiro Yamada wrote:
> 2016-01-05 19:13 GMT+09:00 Arnd Bergmann <arnd@arndb.de>:
> > On Tuesday 05 January 2016 11:17:53 Masahiro Yamada wrote:
> 
> This bus is used to connect external (on-board) devices with the SoC.
> 
> So, no possibility for AMBA, but
> I want "simple-bus" for grouping some device nodes.
> Also, "simple-mfd" would be useful because an external device could be an MFD.
> 
> 
> Please see arch/arm/boot/dts/uniphier-support-card.dtsi
> 
> It describes an add-on card (expansion board)
> which has ETHER, UART, etc. on it.
> 
> I implemented it as "simple-bus".
> 
> This card is connected to the chip select 1
> of the UniPhier System Bus.
> 

Ok, got it. So you could alternatively define your own match table
in the driver with just "simple-bus" and  "simple-mfd". I think either
way is fine, let's see what the DT maintainers prefer.

	Arnd