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

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Date:	Thu, 17 Jul 2008 14:49:51 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Trent Piepho <tpiepho@...escale.com>
Cc:	avorontsov@...mvista.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 01:18:18PM -0700, Trent Piepho wrote:
> On Thu, 17 Jul 2008, Grant Likely wrote:
> > 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.
> 
> Basically what I did then in my patch then, refactor leds-gpio so most of
> it is shared and there is a block of code that does platform binding and
> another block that does of_platform binding.

Yes

> I didn't change the OF platform binding syntax so as not to complicate the
> example, but that's easy to do.  Something like:
> 
> leds {
>  	compatible = "gpio-led";
>  	gpios = <&mpc8572 6 0
>  	         &mpc8572 7 0>;
>  	labels = "red", "green";
> };
> 
> Or like this, which needs a little more code to parse:
> 
> leds {
>  	compatible = "gpio-led";
>  	led@6 {
>  		gpios = <&mpc8572 6 0>;
>  		label = "red";
>  	};
>  	led@7 {
>  		gpios = <&mpc8572 7 0>;
>  		label = "green";
>  	};
> };

I kind of like the second option better, because there is less chance
of doing bad stuff if the gpio specifier was buggered up; but I'm cool
with either.

However, if the second option is chosen then something like the following
might be better as it eliminates the meaningless @<number> specifier.

leds {
	compatible = "gpio-led";
	red {
		gpios = <&mpc8572 6 0>;
	};
	green {
		gpios = <&mpc8572 7 0>;
	};
};

Cheers,
g.
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