linux-kernel - Re: [PATCH v3 10/15] leds: leds-gpio: Add ACPI probing support

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Message-ID: <20141001115901.GD1786@lahna.fi.intel.com>
Date:	Wed, 1 Oct 2014 14:59:01 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	devicetree@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Aaron Lu <aaron.lu@...el.com>,
	Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [PATCH v3 10/15] leds: leds-gpio: Add ACPI probing support

On Wed, Oct 01, 2014 at 12:01:34PM +0200, Arnd Bergmann wrote:
> On Wednesday 01 October 2014 12:13:09 Mika Westerberg wrote:
> > 
> > > Regarding the MODULE_DEVICE_TABLE, I suspect the above won't work the
> > > way you are hoping for, because once you get to dozens or hundreds of
> > > drivers doing this, each device will show up with the same string,
> > > so udev will try to load all the modules that list "PRP0001". That
> > > doesn't look right. With the code from patch 3, you can probably drop
> > > the acpi MODULE_DEVICE_TABLE() entirely and get the correct behavior.
> > 
> > It actually works like this now:
> > 
> >  # cd /sys/bus/platform/devices/PRP0001\:00/
> >  DRIVER=leds-gpio
> >  MODALIAS=of:Nprp0001TacpiCgpio-leds
> > 
> >  # cat modalias 
> >  of:Nprp0001TacpiCgpio-leds
> > 
> > In other words the modalias changes to be of:Nprp0001Tacpi, e.g
> > name=prp0001, type=acpi and then list of compatible values.
> > 
> > Udev then loads only module that matches the modalias so it should not
> > load everything listing PRP0001 in their MODULE_DEVICE_TABLE().
> 
> I'm not completely following yet. I can see how this works now, but
> how is this better than just using the existing modalias for OF?

You mean using just what of_device_get_modalias() would create? In that
case, what do we put to name and type fields?
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