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

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