linux-kernel - Re: [PATCH 26/30] ARM: omap: add board autoselection

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Date:	Mon, 3 Oct 2011 11:27:44 +0200
From:	"Cousson, Benoit" <b-cousson@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	Tony Lindgren <tony@...mide.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 26/30] ARM: omap: add board autoselection

On 10/3/2011 11:11 AM, Arnd Bergmann wrote:
> On Monday 03 October 2011 10:58:23 Santosh Shilimkar wrote:
>>> +config MACH_OMAP_AUTO_BOARD
>>> +     def_bool y
>>> +     depends on !MACH_OMAP2_TUSB6010
>>> +     depends on !MACH_OMAP_H4
>>> +     depends on !MACH_OMAP_APOLLON
>>> +     depends on !MACH_OMAP_APOLLON
>>> +     depends on !MACH_OMAP_2430SDP
>>> +     depends on !MACH_OMAP3_BEAGLE
>>> +     depends on !MACH_DEVKIT8000
>>> +     depends on !MACH_OMAP_LDP
>>> +     depends on !MACH_OMAP3530_LV_SOM
>>> +     depends on !MACH_OMAP3_TORPEDO
>>> +     depends on !MACH_OVERO
>>> +     depends on !MACH_OMAP3EVM
>>> +     depends on !MACH_OMAP3517EVM
>>> +     depends on !MACH_CRANEBOARD
>>> +     depends on !MACH_OMAP3_PANDORA
>>> +     depends on !MACH_OMAP3_TOUCHBOOK
>>> +     depends on !MACH_NOKIA_N8X0
>>> +     depends on !MACH_NOKIA_RM680
>>> +     depends on !MACH_NOKIA_RX51
>>> +     depends on !MACH_OMAP_ZOOM2
>>> +     depends on !MACH_OMAP_ZOOM3
>>> +     depends on !MACH_CM_T35
>>> +     depends on !MACH_CM_T3517
>>> +     depends on !MACH_IGEP0020
>>> +     depends on !MACH_IGEP0030
>>> +     depends on !MACH_SBC3530
>>> +     depends on !MACH_OMAP_3630SDP
>>> +     depends on !MACH_TI8168EVM
>>> +     depends on !MACH_OMAP4_PANDA
>> Do we need all above 'depends on *' ?
>> Even if they get selected for one of the below
>> ARCH along with default machine, build should be happy.
>> Right ?
>
> I'm not too happy with having to maintain a list for each subarchitecture,
> when each one has the same problem. In general, I would really like to have
> the flexibility to disable all but any one board, which requires either
> maintaining a list like the above, or expressing the same like
>
> config MACH_OMAP_AUTO_BOARD
> 	 def_bool y
>         depends on !MACH_OMAP_BOARD_SELECTED
>         select MACH_OMAP_GENERIC if ARCH_OMAP2
>         select MACH_OMAP_3430SDP if ARCH_OMAP3&&  !ARCH_OMAP2
>         select MACH_OMAP_4430SDP if ARCH_OMAP4&&  !ARCH_OMAP3&&  !ARCH_OMAP2
>
> and adding a 'select MACH_OMAP_BOARD_SELECTED' for each one. Slightly more
> to write but perhaps a little less error-prone.
>
> In the long run, I'd hope we can just get rid of these for subarchitectures
> that support device tree probing and make the device tree based machine
> description unconditional.

This is really our goal, we will have soon the board-generic.c for that, 
someone will *just* have to migrate these ~30 board files to device tree 
DTS files :-)

Regards,
Benoit
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