linux-kernel - Re: [PATCH v3] leds: implement OpenFirmare GPIO LED driver

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Message-ID: <fa686aa40807171105m22dda41dqb334dd5f7b2634d8@mail.gmail.com>
Date:	Thu, 17 Jul 2008 12:05:28 -0600
From:	"Grant Likely" <grant.likely@...retlab.ca>
To:	avorontsov@...mvista.com
Cc:	"Trent Piepho" <tpiepho@...escale.com>,
	"Richard Purdie" <rpurdie@...ys.net>,
	"Stephen Rothwell" <sfr@...b.auug.org.au>,
	"Kumar Gala" <galak@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH v3] leds: implement OpenFirmare GPIO LED driver

On Thu, Jul 17, 2008 at 9:20 AM, Anton Vorontsov
<avorontsov@...mvista.com> wrote:
> On Thu, Jul 17, 2008 at 09:04:22AM -0600, Grant Likely wrote:
>> On Thu, Jul 17, 2008 at 06:13:35PM +0400, Anton Vorontsov wrote:
>> > On Thu, Jul 17, 2008 at 06:05:19PM +0400, Anton Vorontsov wrote:
>> > [...]
>> > > > I think it would be better to have a module that scans the device tree
>> > > > for LED nodes and registers a single leds-gpio platform device for the
>> > > > whole lot.
>> > > >
>> > > > Thoughts?
>> > >
>> > > I like the idea, thanks.
>> >
>> > Ugh, no. The idea sounds good, but in practice it isn't, since we'll
>> > have to handle suspend/resume ops ourselves. When we stick with the
>> > device/driver model we're getting all this for free.
>>
>> Won't the leds-gpio driver give you suspend/resume support?
>
> Ah. I just wrongly read your message. You're purposing to use gpio
> leds platform driver... I think this is doable, yes.

Alternately, I would also be okay with a scheme where all LED nodes
have a common parent and an of_platform driver would bind against the
parent node; not the individual children.  Then the leds-gpio driver
could be refactored to have both platform and of_platform bus
bindings.

Cheers,
g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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