linux-kernel - Re: [PATCH v5 2/2] arm: pxa27x: support for ICP DAS LP-8x4x w/ DT

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Date:	Tue, 15 Dec 2015 20:24:41 +0300
From:	Sergei Ianovich <ynvich@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, Daniel Mack <zonque@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Thierry Reding <treding@...dia.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Arnaud Ebalard <arno@...isbad.org>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 2/2] arm: pxa27x: support for ICP DAS LP-8x4x w/ DT

On Tue, 2015-12-15 at 18:02 +0100, Arnd Bergmann wrote:
> On Tuesday 15 December 2015 19:42:07 Sergei Ianovich wrote:
> > There are several board-specific devices on LP8x4x: custom FPGA,
> > custom
> > UART, custom IRQ on FPGA, custom parallel bus for industrial IO. The
> > defconfig file could alert potential users to this fact. If this is
> > not
> > a sufficient reason to have a defconfig file, it can be dropped.
> > 
> > I use the full .config anyway 
> 
> I would like those drivers to be enabled in some defconfig, so we get
> compile-time coverage, but we generally stopped having one-config-per-
> board
> files.
> 
> Maybe we can have a pxa_defconfig file that enables lots of boards
> and then we remove the individual configs? We don't have to remove
> them all at once, but it would make me very happy if we could at
> least kill off some of the ones that are not used regularly.

lp8x4x seems to be the first pxa board which requires DT.

We can create pxa27x-dt_defconfig which selects:
1. PXA27X_DT
2. PXA_FB and 8250_PXA to enable console
3. MMC, MMC_PXA and EXT4_FS to enable boot from MMC
4. all optional pxa stuff as modules
5. all stuff on supported pxa boards as modules

If #5 is extended when support for new boards is added, it should be
possible to run any supported pxa27x board with pxa27x_defconfig.
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