linux-kernel - Re: [PATCH 1/5] staging: drivers: mfd: Add MAX77541/MAX77540 PMIC Support

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Date:   Wed, 7 Dec 2022 13:24:10 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Okan Sahin <okan.sahin@...log.com>
Cc:     outreachy@...ts.linux.dev, Lee Jones <lee@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Marcus Folkesson <marcus.folkesson@...il.com>,
        Manish Narani <manish.narani@...inx.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        William Breathitt Gray <william.gray@...aro.org>,
        Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Ramona Bolboaca <ramona.bolboaca@...log.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        Marcelo Schmitt <marcelo.schmitt1@...il.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH 1/5] staging: drivers: mfd: Add MAX77541/MAX77540 PMIC
 Support

On Wed, Dec 07, 2022 at 12:08:40PM +0300, Okan Sahin wrote:
> This patch adds MFD driver for MAX77541/MAX77540 to enable its sub
> devices.
> 
> The MAX77541 is a multi-function devices. It includes
> buck converter and ADC.
> 
> The MAX77540 is a high-efficiency buck converter
> with two 3A switching phases.
> 
> They have same regmap except for ADC part of MAX77541.

Same comment as per patch 2.

...

> +	help
> +	  Say yes here to add support for Analog Devices
> +	  MAX77541 and MAX77540 Power Management ICs.
> +	  This driver provides common support for accessing the device;
> +	  additional drivers must be enabled in order to use the functionality
> +	  of the device.

Arbitrary line lengths.

...

> +		return devm_mfd_add_devices(dev, -1, max77540_devs, ARRAY_SIZE(max77540_devs),

There is a definition for -1, use it.

> +					    NULL, 0, NULL);

...

> +		return devm_mfd_add_devices(dev, -1, max77541_devs, ARRAY_SIZE(max77541_devs),

Ditto.

> +					    NULL, 0, NULL);

...

> +	chip_id = to_i2c_driver(client->dev.driver)->id_table;

> +	if (!chip_data) {
> +		chip_data = (void *)i2c_match_id(chip_id, client)->driver_data;


> +	}

We have a new helper for this.

...

> +		return dev_err_probe(me->dev,  PTR_ERR(me->regmap),
> +					"Failed to allocate register map\n");

Wrong indentation.

...

> +

Redundant blank line.

> +module_i2c_driver(max77541_i2c_driver);

...

> +MODULE_VERSION("1.0");

Why?

...

Missing inclusions:
 - bits.h
 - types.h

Missing forward declarations for:
	struct device
	struct regmap
	struct regmap_irq_chip_data
	...

> +/*      REGISTERS       */

...

> +#define MAX77541_REGMAP_IRQ_REG(_mask)	\
> +	{ .mask = (_mask),  }

When {} are on one line, the trailing comma inside is not needed.

...

> +enum mx_range {
> +	LOW_RANGE,
> +	MID_RANGE,
> +	HIGH_RANGE,

> +	RESERVED

Is it terminator?

> +};

...

> +struct max77541_dev {

> +	void *pdata;

Why do you need this?

> +	struct device *dev;

Isn't it the same as dev inside regmap?

> +	struct regmap_irq_chip_data *irq_data;
> +	struct regmap_irq_chip_data *irq_buck;
> +	struct regmap_irq_chip_data *irq_topsys;
> +	struct regmap_irq_chip_data *irq_adc;

> +	struct i2c_client *i2c;

Is this is really needed? Perhaps regmap below provides what you need, no?

> +	struct regmap *regmap;
> +
> +	u8 type;
> +};

-- 
With Best Regards,
Andy Shevchenko