linux-kernel - Re: [PATCH] of/platform: export of_default_bus_match

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Message-ID: <4336094.nx25lSVlfU@wuerfel>
Date:	Tue, 05 Jan 2016 12:48:29 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	devicetree@...r.kernel.org,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Olof Johansson <olof@...om.net>,
	Frank Rowand <frowand.list@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH] of/platform: export of_default_bus_match_table

On Tuesday 05 January 2016 19:50:31 Masahiro Yamada wrote:
> 2016-01-05 19:13 GMT+09:00 Arnd Bergmann <arnd@...db.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
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