linux-kernel - Re: [PATCH] AT91: add AT91SAM9X5 dummy configuration variable

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Message-Id: <201107051325.47417.arnd@arndb.de>
Date:	Tue, 5 Jul 2011 13:25:47 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Jean-Christophe PLAGNIOL-VILLARD" <plagnioj@...osoft.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>, balbi@...com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	avictor.za@...il.com
Subject: Re: [PATCH] AT91: add AT91SAM9X5 dummy configuration variable

On Tuesday 05 July 2011, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > You have convinced me.
> > But I will have to remove the other dependencies that I mentioned before
> > in the thread.
> > 
> > We can drop this patch.
> I prefer to hide the platform specific driver other wise we will have a huge
> menu entry in Kconfig with unrelated drivers that can not be used at all on
> the selected mach

I fear it's too late for that. You already have to decide on many thousands
of configuration options, most of which are totally irrelevant for a
particular system.

IMHO, the two much better ways to deal with SOC-specific device drivers
are defconfig files and/or specific defaults, like

config ABX500_CORE
        bool "ST-Ericsson ABX500 Mixed Signal Circuit register functions"
        default ARCH_U300 || ARCH_U8500

This lets everybody choose whether they would like to build the driver
or not, which is very useful for allyesconfig/allnoconfig/randconfig
builds. At the same time, the default gets it right in almost all
other cases.

	Arnd
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