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

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Date:	Thu, 17 Jul 2008 13:18:18 -0700 (PDT)
From:	Trent Piepho <tpiepho@...escale.com>
To:	Grant Likely <grant.likely@...retlab.ca>
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, 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.

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 like the first better.  It follows the example from the docs about how
devices with multiple gpios should work too.
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