linux-kernel - Re: [RFC PATCH] ARM: at91: remove no-MMU at91x40 support

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Date:	Wed, 24 Sep 2014 17:03:11 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<u.kleine-koenig@...gutronix.de>, <gerg@...inux.org>,
	Olof Johansson <olof@...om.net>,
	ARM Maintainers <arm@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Patrice Vilchez <patrice.vilchez@...el.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Subject: Re: [RFC PATCH] ARM: at91: remove no-MMU at91x40 support

On 24/09/2014 16:47, Arnd Bergmann :
> On Wednesday 24 September 2014 16:18:01 Nicolas Ferre wrote:
>> As there is currently no-one to take care of this old !MMU target and as its
>> support in recent kernels is a bit rotten, remove this at91x40 support and the
>> board file associated with it (at91eb01).
>> There are modern ARM !MMU in Mainline now so this target is not interesting for
>> building tests anymore. It would be better to start from these modern ARM !MMU
>> platforms to reintroduce at91x40 support if needed.
>>
>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> 
> Acked-by: Arnd Bergmann <arnd@...db.de>
> 
>> diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
>> index 807b22dadcb6..f3bd8abd25c0 100644
>> --- a/arch/arm/mach-at91/Kconfig
>> +++ b/arch/arm/mach-at91/Kconfig
>> @@ -18,26 +18,22 @@ config HAVE_AT91_DBGU2
>>  config AT91_USE_OLD_CLK
>>  	bool
>>  
>> -config AT91_PMC_UNIT
>> -	bool
>> -	default !ARCH_AT91X40
>> -
>>  config COMMON_CLK_AT91
>>  	bool
>> -	default AT91_PMC_UNIT && USE_OF && !AT91_USE_OLD_CLK
>> +	default USE_OF && !AT91_USE_OLD_CLK
>>  	select COMMON_CLK
>>  
>>  config OLD_CLK_AT91
>>  	bool
>> -	default AT91_PMC_UNIT && AT91_USE_OLD_CLK
>> +	default AT91_USE_OLD_CLK
>>  
>>  config AT91_SAM9_ALT_RESET
>>  	bool
>> -	default !ARCH_AT91X40
>> +	default y
>>  
>>  config AT91_SAM9G45_RESET
>>  	bool
>> -	default !ARCH_AT91X40
>> +	default y
>>  
>>  config AT91_SAM9_TIME
>>  	bool
> 
> I think these can be simplified further: AT91_SAM9G45_RESET and
> AT91_SAM9_ALT_RESET can just go away and the files put into
> obj-y.

Yes, I had the same idea before realizing that these two directives will
move away in a patch already sent for 3.18. So, as this material is
probably 3.19-ish, I kept them as they are and keep in mind to remove
them when I merge them with 3.18-rc1...

> OLD_CLK_AT91 is the same as AT91_USE_OLD_CLK, so you could
> just use that instead. I suspect the 'USE_OF' dependency for
> COMMON_CLK_AT91 can also go away, since all platforms are
> either board file based and select AT91_USE_OLD_CLK, or they
> are DT based and don't.

Here also, I didn't want to touch more because we need to remove the
arch/arm/mach-at91/Kconfig.non_dt file very soon (3.19) and I don't want
to change this file (or all the SoC files) before the chunks related to
these directives simply go away.

Tell me if it makes sense.

Bye,
-- 
Nicolas Ferre
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