linux-kernel - Re: [PATCH v3 1/2] hwmon: (lm90) Add power control

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Date:	Wed, 11 Sep 2013 19:35:35 +0800
From:	Wei Ni <wni@...dia.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Stephen Warren <swarren@...dotorg.org>,
	Guenter Roeck <linux@...ck-us.net>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"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 v3 1/2] hwmon: (lm90) Add power control

On 09/11/2013 02:52 AM, Mark Brown wrote:
> * PGP Signed by an unknown key
> 
> On Tue, Sep 10, 2013 at 12:37:47PM -0600, Stephen Warren wrote:
> 
>> OK, so for the DT binding we should make vcc-supply a required
>> property, yet the driver will still work OK if that property just
>> happens to be missing (or e.g. when instantiated from a board file,
>> and there's no regulator).
> 
> Yup.  That way we've got both the binding and code trying to make things
> work, hopefully that'll maximise robustness.

Ok, it looks like regulator_get will handle all things, looking forward
to your patches :)
Then I think my changes will be simple, just something like:
+	reg = devm_regulator_get(dev, "vcc");
+	if (!IS_ERR(reg)) {
+		err = regulator_enable(reg);
+		if (err < 0)
+			return err;
+	} else {
+		return PTR_ERR(reg);
+	}

Wei.

> 
> * Unknown Key
> * 0x7EA229BD
> 

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