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

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Message-ID: <5127EA13.9010403@nvidia.com>
Date:	Fri, 22 Feb 2013 16:58:43 -0500
From:	Rhyland Klein <rklein@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Anton Vorontsov <cbou@...l.ru>,
	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 2/22/2013 3:09 PM, Stephen Warren wrote:
> On 02/21/2013 04:11 PM, Rhyland Klein wrote:
>> With the growing support for dt, it make sense to try to make use of
>> dt features to make the general code cleaner. This patch is an
>> attempt to commonize how chargers and their supplies are linked.
>>
>> Following common dt convention, the "supplied-to" char** list is
>> replaced with phandle lists defined in the supplies which contain
>> phandles of their suppliers.
>>
>> This has the effect however of introducing an inversion in the internal
>> mechanics of how this information is stored. In the case of non-dt,
>> the char** list of supplies is stored in the charger. In the dt case,
>> a device_node * list is stored in the supplies of their chargers,
>> however this seems to be the only way to support this.
> grep over the whole kernel tree for supplied_to doesn't yield /too/ many
> hits, although I didn't look at the complexity of most of them. Would it
> be possible to invert all the current in-kernel uses to represent a
> supplied_from/by model instead? That would mean the proposed DT binding
> would then represent the same relationship ordering as the kernel code,
> which would be easier to handle.
I think it is surely possible to change all the existing drivers to the 
inverse logic as
you suggested. That might make a good follow patchset.

-rhyland

-- 
nvpublic

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