linux-kernel - Re: [PATCH 4/8] minnowboard: Add base platform driver for the MinnowBoard

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Message-ID: <1374463673.3436.68.camel@dvhart-mobl1.amr.corp.intel.com>
Date:	Sun, 21 Jul 2013 20:27:53 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"peter.p.waskiewicz.jr" <peter.p.waskiewicz.jr@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	danders <danders@...cuitco.com>,
	"vishal.l.verma" <vishal.l.verma@...el.com>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Richard Purdie <richard.purdie@...uxfoundation.org>,
	platform-driver-x86 <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH 4/8] minnowboard: Add base platform driver for the
 MinnowBoard

On Mon, 2013-07-22 at 01:09 +0100, Grant Likely wrote:
> On Thu, Jul 4, 2013 at 5:26 PM, Mark Brown <broonie@...nel.org> wrote:
> > On Thu, Jun 27, 2013 at 10:43:38PM -0700, Darren Hart wrote:
> >
> >> minnow_hwid() just returns an int that the minnowboard platform driver
> >> read from the GPIO. This seems like a proper abstraction to me. Do you
> >> object to this one as well?
> >
> > We should really have a subsystem for this too - the general idea idea
> > of identifying boards, fit options and so on by looking at things like
> > GPIOs or numbers in flash is really common.
> 
> And yet this is a platform with ACPI. I would expect the ACPI to
> identify the board, not a custom driver. The newest ACPI spec adds a
> lot of nice useful things like GPIO and SPI bindings. Talk to Al Stone
> about the progress his team has made on adding GPIO support to ACPICA.
> 
> This driver shouldn't be merged into mainline. Keep it as an
> out-of-tree patch until the proper solution is implemented. That
> shouldn't be too onerous since we now have available not one, but two
> mechanisms for describing exactly what you want to do; ACPI or FDT.

Yes, that is the current plan. I have isolated the necessary patches for
bug fixes (merged, serial support (merged) and networking support (under
review). I am exploring different options with ACPI for how to best
handle the GPIO (LEDs and Keys) and the Lure device descriptions.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel


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