linux-kernel - Re: [PATCH V2] gpio: palmas: add dt support

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Date:	Tue, 16 Apr 2013 12:44:59 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	linus.walleij@...aro.org, grant.likely@...retlab.ca,
	rob.herring@...xeda.com, gg@...mlogic.co.uk, ian@...mlogic.co.uk,
	j-keerthy@...com, t-kristo@...com, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, swarren@...dia.com
Subject: Re: [PATCH V2] gpio: palmas: add dt support

On 04/16/2013 08:31 AM, Laxman Dewangan wrote:
> Add of_device_id table for Palma GPIO to be enable the
> driver from DT file.
> 
> The driver can be registered from DT file as:
> 	palmas: tps65913@58 {
> 		:::::::::::
> 		palmas_gpio: palmas_gpio {
> 			compatible = "ti,palmas-gpio";
> 			gpio-controller;
> 			#gpio-cells = <2>;
> 		};
> 	};

So I think this patch looks fine if everyone is agreed that all the
Palmas sub-modules are represented as explicit child nodes in DT, and
the probing of the child nodes is based on the top-level Palmas device
being a bus, and enumerating its children in standard DT style, using
compatible values. (I'm not sure how the child probing/instantiation
will work for non-DT systems though).

I'm not 100% sure if an agreement on the top-level structure of the
Palmas DT bindings was reached though? Can the SlimLogic people confirm
this? I assume Laxman must be OK with it since he's sending this patch?

It might be a good idea to get the final Palmas binding documentation
reviewed and checked in before changing the drivers/.dts files to match
what the final bindings might be.
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