linux-kernel - Re: [PATCH v4 3/3] Documentation: dt: hwmon: add OF document for LM90

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Message-ID: <20130916102337.GZ29403@sirena.org.uk>
Date:	Mon, 16 Sep 2013 11:23:37 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Wei Ni <wni@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] Documentation: dt: hwmon: add OF document for LM90

On Mon, Sep 16, 2013 at 12:28:43PM +0800, Wei Ni wrote:
> On 09/12/2013 11:00 PM, Stephen Warren wrote:

> >> +- vcc-supply: vcc regulator for the supply voltage.
> >> +              If this is not set, assuming vcc is always powered.

> > I thought that was going to be a "Required Property".

> There may have many platforms without regulator, they always power on
> this device, so how can they set this "vcc-supply "property if we set it
> as "Required Property".
> Set to dummy-regulator? but it seems the regulator framework can't
> handle it yet.

To repeat once more: these platforms will physically have a regulator,
the device won't function without power and unfortunately the device
tree bindings only have optional and required properties.

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