linux-kernel - Re: [RFC 7/7] MFD: TWL6040: Add regulator support for VIO, V2V1 supplies

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Date:	Thu, 2 Feb 2012 12:52:50 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Liam Girdwood <lrg@...com>, Dmitry Torokhov <dtor@...l.ru>,
	Misael Lopez Cruz <misael.lopez@...com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 7/7] MFD: TWL6040: Add regulator support for VIO, V2V1
 supplies

On Thu, Feb 02, 2012 at 02:16:59PM +0200, Peter Ujfalusi wrote:

> +	twl6040->vio = regulator_get(&client->dev, "vio");
> +	if (IS_ERR(twl6040->vio)) {
> +		ret = PTR_ERR(twl6040->vio);
> +		dev_err(&client->dev, "Failed to request VIO supply: %d\n",
> +			ret);
> +		goto regulator_get_err;
> +	}
> +	twl6040->v2v1 = regulator_get(&client->dev, "v2v1");
> +	if (IS_ERR(twl6040->v2v1)) {
> +		ret = PTR_ERR(twl6040->v2v1);
> +		dev_err(&client->dev, "Failed to request V2V1 supply: %d\n",
> +			ret);
> +		regulator_put(twl6040->vio);
> +		goto regulator_get_err;
> +	}

Looks like you want regulator_bulk_get() here.  Or (better yet though
it'd be a potential issue for merge via MFD and the benefits aren't that
exciting since you still need to disable) devm_regulator_bulk_get().

> +	ret = regulator_enable(twl6040->vio);
> +	if (ret != 0) {
> +		dev_err(&client->dev, "Failed to enable VIO: %d\n", ret);
> +		goto power_err;
> +	}
> +	ret = regulator_enable(twl6040->v2v1);
> +	if (ret != 0) {
> +		dev_err(&client->dev, "Failed to enable V2V1: %d\n", ret);
> +		regulator_disable(twl6040->vio);
> +		goto power_err;
> +	}

Similarly regulator_bulk_enable() here, and it'll fix...

>  gpio1_err:
> +	regulator_disable(twl6040->v2v1);
> +	regulator_disable(twl6040->vio);

...the fact that if you fail to enable the v2.1 regulator you don't
disable vio.

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