Re: [PATCH v5 5/5] mfd: max77541: Add ADI MAX77541/MAX77540 PMIC Support

[Andy Shevchenko]

On Tue, Feb 21, 2023 at 01:39:13PM +0300, Okan Sahin wrote:
> 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.

Extra space in the Subject.

...

> +#include <linux/of_device.h>

Why?

...

> +static const struct regmap_config max77541_regmap_config = {
> +	.reg_bits   = 8,
> +	.val_bits   = 8,

Do you need lock of regmap?

> +};

...

> +static const struct mfd_cell max77540_devs[] = {

> +	MFD_CELL_OF("max77540-regulator", NULL, NULL, 0, 0,
> +		    NULL),

Perfectly one line.

> +};

> +static const struct mfd_cell max77541_devs[] = {
> +	MFD_CELL_OF("max77541-regulator", NULL, NULL, 0, 0,
> +		    NULL),
> +	MFD_CELL_OF("max77541-adc", NULL, NULL, 0, 0,
> +		    NULL),

Ditto.

> +};

...

> +	if (max77541->chip->id == MAX77541) {
> +		ret = devm_regmap_add_irq_chip(dev, max77541->regmap, irq,
> +					       IRQF_ONESHOT | IRQF_SHARED, 0,
> +					       &max77541_adc_irq_chip,
> +					       &max77541->irq_adc);
> +		if (ret)
> +			return ret;
> +	}

> +	return ret;

return 0;

...

> +static const struct i2c_device_id max77541_i2c_id[];

What for?

...

> +	if (dev->of_node)
> +		max77541->chip  = of_device_get_match_data(dev);
> +	else
> +		max77541->chip  = (struct chip_info *)
> +					i2c_match_id(max77541_i2c_id,
> +						     client)->driver_data;

Oh. Please use

	const struct i2c_device_id *id = i2c_client_get_device_id(client);
	...
	max77541->chip  = device_get_match_data(dev); // needs property.h
	if (!max77541->chip)
		max77541->chip  = (struct chip_info *)id->driver_data;

> +	if (!max77541->chip)
> +		return -EINVAL;

...

> +#ifndef __MAX77541_MFD_H__
> +#define __MAX77541_MFD_H__

Can we go towards consistency in this?
Seems to me the most used patter so far is

#ifndef __LINUX_MFD_MAX77541_H

-- 
With Best Regards,
Andy Shevchenko