linux-kernel - Re: [PATCH v4 3/4] pmbus: add regulator support

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Date:	Thu, 2 Oct 2014 12:20:11 +0100
From:	Mark Brown <broonie@...nel.org>
To:	atull@...nsource.altera.com
Cc:	linux@...ck-us.net, jdelvare@...e.de, lm-sensors@...sensors.org,
	lgirdwood@...il.com, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, delicious.quinoa@...il.com,
	dinguyen@...nsource.altera.com, yvanderv@...nsource.altera.com
Subject: Re: [PATCH v4 3/4] pmbus: add regulator support

On Wed, Oct 01, 2014 at 02:05:49PM -0500, atull@...nsource.altera.com wrote:
> From: Alan Tull <atull@...nsource.altera.com>
> 
> Add support for simple on/off control of each channel.

This is basically fine but the regulator API has moved on a bit with the
DT handling over the time you've been working on this.

> Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> 
> v2: Remove '#include <linux/regulator/machine.h>'
>     Only one regulator per pmbus device

Put this after the --- as covered in SubmittingPatches.

> +static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
> +{
> +	struct device *dev = rdev_get_dev(rdev);
> +	struct i2c_client *client = to_i2c_client(dev->parent);
> +	u8 page = rdev_get_id(rdev);
> +
> +	return pmbus_update_byte_data(client, page, PMBUS_OPERATION,
> +				      PB_OPERATION_CONTROL_ON,
> +				      enable ? PB_OPERATION_CONTROL_ON : 0);
> +}
> +
> +static int pmbus_regulator_enable(struct regulator_dev *rdev)
> +{
> +	return _pmbus_regulator_on_off(rdev, 1);
> +}

I'm not sure factoring out the code actually won much here.

> +	np_regulators = of_get_child_by_name(dev->of_node, "regulators");
> +	if (!np_regulators)
> +		return 0;
> +
> +	ret = of_regulator_match(dev, np_regulators, info->reg_matches,
> +				 info->num_regulators);
> +	of_node_put(np_regulators);

We now have helpers in the regulator core for this - set of_match and
regulators_node in the regulator descriptor and the core will resolve
this stuff for you and...

> +		if (pdata && pdata->reg_init_data) {
> +			config.init_data = &pdata->reg_init_data[i];
> +		} else {
> +			config.init_data = info->reg_matches[i].init_data;
> +			config.of_node = info->reg_matches[i].of_node;
> +		}

...you can just drop the else case (and check for reg_init_data) here.

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