linux-kernel - Re: [PATCH 08/22] regulator: Change ab8500 match names to reflect Device Tree

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Date:	Fri, 01 Jun 2012 12:36:28 +0800
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Chris Ball <cjb@...top.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Bengt Jonsson <bengt.g.jonsson@...ricsson.com>,
	Mattias WALLIN <mattias.wallin@...ricsson.com>,
	linux-arm-kernel@...ts.infradead.org, sameo@...ux.intel.com,
	grant.likely@...retlab.ca, linux-kernel@...r.kernel.org,
	arnd@...db.de, Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 08/22] regulator: Change ab8500 match names to reflect
 Device Tree

On 31/05/12 00:41, Mark Brown wrote:
> On Wed, May 30, 2012 at 11:22:33PM +0800, Lee Jones wrote:
>> On 30/05/12 23:11, Mark Brown wrote:
>
>>>> 	vin-supply =<&db8500_vape_reg>;
>>>> 	vmmc-supply =<&ab8500_ldo_aux2_reg>;
>
>>> Oh, oops.  This is going to be fun when someone puts down two of the
>>> same PMIC on a system...
>
>> What does that mean sorry?
>
> Lots of regulators are using this mechanism for identifying child nodes.
> If the node name is also used as a handle by other things to reference
> the regulator then if you have two PMICs of the same type DTC isn't
> going to be able to figure out which node you mean.

Yes, so it doesn't look like this is an issue.

This:

> sdi@...26000 {
>          vmmc-supply = <&ab8500_ldo_aux3_reg>;
> };

Is the same as, and will cause no more issues than:

> static struct regulator_consumer_supply ab8500_vaux3_consumers[] = {
>         REGULATOR_SUPPLY("vmmc", "sdi0"),
> };

... because only nodes which we care about (dictated by compatible 
declaration protections) will be parsed. So different platforms will not 
affect each other.

Kind regards,
Lee

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
M: +44 77 88 633 515
Linaro.org │ Open source software for ARM SoCs
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