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

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Message-ID: <1383142680.2460.5.camel@dvhart-mobl4.amr.corp.intel.com>
Date:	Wed, 30 Oct 2013 14:18:00 +0000
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Lee Jones <lee.jones@...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>,
	Grant Likely <grant.likely@...aro.org>,
	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 00:41 +0100, Mark Brown wrote:
> On Sat, Jul 20, 2013 at 07:37:54PM +0200, Linus Walleij wrote:
> > On Thu, Jul 4, 2013 at 6:26 PM, Mark Brown <broonie@...nel.org> wrote:
> 
> > > 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.
> 
> > Would it then be a bus following the pattern we chiseled out for
> > the soc bus? (Greg, Lee & Arnd architectured this.)
> 
> I'd expect it to be a bus, yes.

It seems to me the platform bus already provides everything we need. We
can just make a platform driver, say platform-id-gpio.c which can get
it's platform data from OF or ACPI (_PRP proposal from kernel summit
last week for example). Why would a separate bus type need to be
defined?

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


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