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

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Date:	Tue, 5 Jan 2016 19:50:31 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Arnd Bergmann <arnd@...db.de>
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

Hi Arnd,

2016-01-05 19:13 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
> On Tuesday 05 January 2016 11:17:53 Masahiro Yamada wrote:
>> Currently, drivers/bus/uniphier-system-bus.c is kept from being a
>> module due to the unresolved reference to of_default_bus_match_table.
>>
>> Refer to commit 326ea45aa827 ("bus: uniphier: allow only built-in
>> driver").
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>> ---
>>
>>  drivers/of/platform.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
>> index af98343..8d103e4 100644
>> --- a/drivers/of/platform.c
>> +++ b/drivers/of/platform.c
>> @@ -31,6 +31,7 @@ const struct of_device_id of_default_bus_match_table[] = {
>>  #endif /* CONFIG_ARM_AMBA */
>>         {} /* Empty terminated list */
>>  };
>> +EXPORT_SYMBOL(of_default_bus_match_table);
>
> I wonder if the uniphier bus should actually use the default
> match table at all. Sorry for not having thought of that when
> I did my patch.
>
> What kinds of devices do you see below this bus? Do you have multiple
> levels of devices? Are they all platform devices or could they
> be AMBA?


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.


-- 
Best Regards
Masahiro Yamada
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