linux-kernel - Re: [RFC PATCH v2 1/4] regulator: Add helper function to get "poweroff-source" property

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Date:	Fri, 10 Oct 2014 14:29:00 +0200
From:	PERIER Romain <romain.perier@...il.com>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	devicetree <devicetree@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Heiko Stübner <heiko@...ech.de>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, robh <robh@...nel.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Anton Vorontsov <anton@...msg.org>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [RFC PATCH v2 1/4] regulator: Add helper function to get
 "poweroff-source" property

>
> What I'm more concerned about is the semantics of the property. What
> do the generic code paths gain by standardizing this property? Is it
> expected that

We really need to come up with a standard property for this and document
it rather than continuing to add individual device specific properties
each time a driver adds poweroff capability,
all doing the same thing (a lot of regulators driver, mfd drivers, soc
specific drivers, power drivers already do that, that's very redudant)
. This is a simple unification logic.
About its name, I found my inspiration with "wakeup-source" which
marks an device as able to wakeup the system, poweroff capability is
exactly the same
except that the device will control the power of the system, so I
choose "poweroff-source". However, suggestions are welcome ;)

About of_regulator.c, I agree with Mark. poweroff capability is not
really specific to regulators, so it does not make sense to put the
helper there, imho.

Romain
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