linux-kernel - Re: [PATCH 3/7] regulator: MT6397: Add support for MT6397 regulator

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Date:	Mon, 17 Nov 2014 23:40:12 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Flora Fu <flora.fu@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Vladimir Murzin <vladimir.murzin@....com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, srv_heupstream@...iatek.com,
	Sascha Hauer <kernel@...gutronix.de>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Dongdong Cheng <dongdong.cheng@...iatek.com>
Subject: Re: [PATCH 3/7] regulator: MT6397: Add support for MT6397 regulator

On Mon, Nov 17, 2014 at 03:40:23PM +0800, Flora Fu wrote:

This looks mostly good but there are a few fairly straightfoward things:

> @@ -725,5 +725,11 @@ config REGULATOR_WM8994
>  	  This driver provides support for the voltage regulators on the
>  	  WM8994 CODEC.
>  
> +config REGULATOR_MT6397
> +	tristate "MediaTek MT6397 PMIC"
> +	depends on MFD_MT6397
> +	help
> +	   This driver provides support for the voltage regulators on the MediaTek MT6397 PMIC.
> +
>  endif

Keep this and the Makefile sorted.

> +static int mt6397_buck_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
> +{


> +	vosel = info->buck_conf.vosel_reg;
> +	voselon = info->buck_conf.voselon_reg;
> +	vosel_mask = info->buck_conf.vosel_mask;

Please use the standard way of specifying data even if you can't use the
standard function.

> +
> +	ret = regmap_update_bits(rdev->regmap, vosel, vosel_mask, sel);
> +	if (ret != 0) {
> +		dev_err(&rdev->dev, "Failed to update vosel: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = regmap_update_bits(rdev->regmap, voselon, vosel_mask, sel);
> +	if (ret != 0) {
> +		dev_err(&rdev->dev, "Failed to update vosel_on: %d\n", ret);
> +		return ret;
> +	}
> +	return 0;

You should add comments here explaining what's going on - it's very
strange to have to write the same value to two different registers and
the names of the registers look suspicously like this is something to do
with a suspend mode...

Missing blank line before the return too.

> +static int mt6397_buck_get_voltage_sel(struct regulator_dev *rdev)
> +{

You could use the regmap based helper for this.

> +static int mt6397_ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
> +{

The LDO operations appear to be identical to the standard regmap
helpers, please use them.

> +	if (is_fixed)
> +		return 0;

You should use the standard fixed voltage regulator support rather than 

> +static int mt6397_regulator_is_enabled(struct regulator_dev *rdev)
> +{

Again this looks like it should be using helpers.

> +#define MT6397_REGULATOR_OF_MATCH(_name, _id)			\
> +[MT6397_ID_##_id] = {						\
> +	.name = #_name,						\
> +	.driver_data = &mt6397_regulators[MT6397_ID_##_id],	\
> +}

Define regulators_node and of_match in the regulator desc and you can
remove both this table and all your DT matching code in the driver, the
core will handle it for you.

> +	if ((reg_value & 0xFF) == MT6397_REGULATOR_ID91) {
> +		j = MT6397_ID_VCAMIO;
> +		mt6397_regulator_matches[j].init_data->constraints.min_uV =
> +		1000000;
> +		mt6397_regulators[j].desc.volt_table = ldo_volt_table5_v2;
> +	}

Use a switch statement, that way other variants can be added more
easily.

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