linux-kernel - Re: [PATCH 2/2] hwmon: pmbus: adp1050 : Add driver support

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Date: Mon, 18 Mar 2024 17:12:37 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Radu Sabau <radu.sabau@...log.com>, Jean Delvare <jdelvare@...e.com>,
 Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
 Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>, linux-hwmon@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 2/2] hwmon: pmbus: adp1050 : Add driver support

On 18/03/2024 12:21, Radu Sabau wrote:
> Add support for ADP1050 Digital Controller for Isolated Power Supplies
> with PMBus interface Voltage, Current and Temperature Monitor.
> 

..

> +static int adp1050_probe(struct i2c_client *client)
> +{
> +	u32 vin_scale_monitor, iin_scale_monitor;
> +	int ret;
> +
> +	if (!i2c_check_functionality(client->adapter,
> +				     I2C_FUNC_SMBUS_WRITE_WORD_DATA))
> +		return -ENODEV;
> +
> +	/* Unlock CHIP's password in order to be able to read/write to it's
> +	 * VIN_SCALE and IIN_SCALE registers.
> +	*/
> +	ret = i2c_smbus_write_word_data(client, ADP1050_CHIP_PASSWORD, 0xFFFF);
> +	if (ret < 0) {
> +		dev_err_probe(&client->dev, "Device can't be unlocked.\n");

Syntax is: return dev_err_probe(). Same in other places.

> +		return ret;
> +	}
> +
> +	ret = i2c_smbus_write_word_data(client, ADP1050_CHIP_PASSWORD, 0xFFFF);
> +	if (ret < 0) {
> +		dev_err_probe(&client->dev, "Device couldn't be unlocked.\n");
> +		return ret;
> +	}
> +
> +	/* If adi,vin-scale-monitor isn't set or is set to 0 means that the
> +	 * VIN monitor isn't used, therefore 0 is used as scale in order
> +	 * for the readings to return 0.
> +	*/

Please use Linux coding style comments. /* and aligned */.


> +	if (device_property_read_u32(&client->dev, "adi,vin-scale-monitor",
> +				     &vin_scale_monitor))
> +		vin_scale_monitor = 0;
> +
> +	/* If adi,iin-scale-monitor isn't set or is set to 0 means that the
> +	 * IIN monitor isn't used, therefore 0 is used as scale in order
> +	 * for the readings to return 0.
> +	*/
> +	if (device_property_read_u32(&client->dev, "adi,iin-scale-monitor",
> +				     &iin_scale_monitor))
> +		iin_scale_monitor = 0;
> +
> +	ret = i2c_smbus_write_word_data(client, ADP1050_VIN_SCALE_MONITOR,
> +					vin_scale_monitor);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_word_data(client, ADP1050_IIN_SCALE_MONITOR,
> +					iin_scale_monitor);
> +	if (ret < 0)
> +		return ret;
> +
> +	return pmbus_do_probe(client, &adp1050_info);
> +}
> +
> +static const struct i2c_device_id adp1050_id[] = {
> +	{"adp1050", 0},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(i2c, adp1050_id);
> +
> +static const struct of_device_id adp1050_of_match[] = {
> +	{ .compatible = "adi,adp1050"},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, adp1050_of_match);
> +
> +static struct i2c_driver adp1050_driver = {
> +	.driver = {
> +		.name = "adp1050",
> +		.of_match_table = of_match_ptr(adp1050_of_match),

Drop of_match_ptr, you will have here warnings.

> +	},
> +	.probe = adp1050_probe,
> +	.id_table = adp1050_id,
> +};
> +module_i2c_driver(adp1050_driver);
> +
> +MODULE_AUTHOR("Radu Sabau <radu.sabau@...log.com>");
> +MODULE_DESCRIPTION("Analog Devices ADP1050 HWMON PMBus Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(PMBUS);

Best regards,
Krzysztof