linux-kernel - Re: [PATCH] ARM: at91: force CPU selection

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Date:	Fri, 13 Mar 2015 20:50:59 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org,
	Brian Norris <computersforpeace@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Andrew Victor <linux@...im.org.za>
Subject: Re: [PATCH] ARM: at91: force CPU selection

On Friday 13 March 2015 19:32:00 Alexandre Belloni wrote:
> On 10/03/2015 at 14:42:24 +0100, Arnd Bergmann wrote :
> > On Tuesday 10 March 2015 10:42:09 Alexandre Belloni wrote:
> > > > 
> > > > I actually added a bunch of these in other places, but have stopped
> > > > doing so because Russell didn't like them, and I tend to follow
> > > > his argument now that it's actually pretty confusing.
> > > > 
> > > > In case of at91, we can do better now, once we have multiplatform
> > > > enabled, and we can simply remove the SOC_SAM_V7 and SOC_SAM_V4_V5
> > > > symbols entirely (if Alexandre's patch doesn't already do that).
> > > > 
> > > 
> > > I didn't remove it to keep the sub menus SOC_SAM_V7 -> SOC_SAMA5D4 and
> > > SOC_SAMA5D3, SOC_SAM_V4_V5 -> SOC_AT91SAM9 and SOC_AT91RM9200. But I can
> > > also expose SOC_AT91RM9200, SOC_AT91SAM9, SOC_SAMA5D3 and SOC_SAMA5D4
> > > instead of SOC_SAM_V7 and SOC_SAM_V4_V5 and remove them.
> > 
> > Exposing multiple levels won't help here since you can never enable
> > both v4/v5 and v7 at the same time in multiplatform.
> > 
> > Just use one level for a 'menuconfig ARCH_AT91' entry and put the
> > four options below that.
> > 
> 
> Actually, I had a closer look today and there is already just one level
> in my current version of patches.
> 
> I can put everything under menuconfig ARCH_AT91 but I can't remove
> SOC_SAM_V7 and SOC_SAM_V4_V5 because that is what is used to select
> which dtb should be compiled.
> 
> This would also break sama5_defconfig. This is a simple fix but that
> means that it makes it difficult to migrate an existing .config.
> 
> I'd say let's keep it that way as this is not broken, unless you really
> want to see SOC_SAM_V7 and SOC_SAM_V4_V5 being removed.
> 

I'm not sure what the latest version looks like, but I think it's fine
to have SOC_SAM_V4_V5 automatically selected when CONFIG_AT91 and
CONFIG_MULTI_V4 || CONFIG_MULTI_V5 are turned on, or selected by
AT91SAM9 and AT91RM9200.

	Arnd
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