linux-kernel - Re: [RFC v2 2/3] power: power_supply: Add core support for supplied

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Message-ID: <20130304174705.GA31100@lizard.fhda.edu>
Date:	Mon, 4 Mar 2013 09:47:06 -0800
From:	Anton Vorontsov <anton@...msg.org>
To:	Rhyland Klein <rklein@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 2/3] power: power_supply: Add core support for
 supplied_nodes

On Mon, Mar 04, 2013 at 12:32:35PM -0500, Rhyland Klein wrote:
[...]
> >>Anton, David, would you be adverse to the changing of supplied_to
> >>from being a
> >>list of batteries stored in a charger to being a list of chargers
> >>stored in batteries?
> >>
> >I wonder if we can support both ways?..
>
> Well, the interesting factor becomes either we end up with 2 arrays
> (supplied_to, supplied_from) or we make 1 array (horray, save space!)
> but need to then either have a flag or use the power_supply type to
> know how to interpret the single array (as supplied_to or supplied_from).
> 
> Adding in the second array and adds a char ** and an int, which doesn't seem
> like as much overhead as trying to figure out how to interpret the
> single array
> so I am inclined to stick with 2 arrays.

Yup, two arrays seems very reasonable. Plus that way we don't need to
convert existing drivers, so we avoid churn.

Thanks!

Anton
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