linux-kernel - Re: [PATCH v7 1/4] drivers: hwmon: Add max31760 fan speed controller driver

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Date:   Fri, 9 Sep 2022 10:47:56 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ibrahim Tilki <Ibrahim.Tilki@...log.com>, jdelvare@...e.com,
        linux@...ck-us.net
Cc:     linux-hwmon@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nurettin Bolucu <Nurettin.Bolucu@...log.com>
Subject: Re: [PATCH v7 1/4] drivers: hwmon: Add max31760 fan speed controller
 driver

On 09/09/2022 09:16, Ibrahim Tilki wrote:
> MAX31760 is a precision fan speed controller with nonvolatile lookup table.
> Device has one internal and one external temperature sensor support.
> Controls two fans and measures their speeds. Generates hardware alerts when
> programmable max and critical temperatures are exceeded.
> 
> Signed-off-by: Ibrahim Tilki <Ibrahim.Tilki@...log.com>
> Reviewed-by: Nurettin Bolucu <Nurettin.Bolucu@...log.com>


> +
> +static int max31760_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct max31760_state *state;
> +	struct device *hwmon_dev;
> +	int ret;
> +
> +	state = devm_kzalloc(dev, sizeof(struct max31760_state), GFP_KERNEL);

sizeof(*)

run checkpatch on your code

> +	if (!state)
> +		return -ENOMEM;
> +
> +	state->regmap = devm_regmap_init_i2c(client, &regmap_config);
> +	if (IS_ERR(state->regmap))
> +		return dev_err_probe(dev,
> +				     PTR_ERR(state->regmap),
> +				     "regmap initialization failed\n");
> +
> +	dev_set_drvdata(dev, state);
> +
> +	/* Set alert output to comparator mode */
> +	ret = regmap_set_bits(state->regmap, REG_CR2, CR2_ALERTS);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "cannot write register\n");
> +
> +	max31760_create_lut_nodes(state);
> +
> +	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
> +							 state,
> +							 &max31760_chip_info,
> +							 state->groups);
> +
> +	return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct of_device_id max31760_of_match[] = {
> +	{.compatible = "adi,max31760"},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, max31760_of_match);
> +
> +static const struct i2c_device_id max31760_id[] = {
> +	{"max31760"},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, max31760_id);
> +
> +static int __maybe_unused max31760_suspend(struct device *dev)
> +{
> +	struct max31760_state *state = dev_get_drvdata(dev);
> +
> +	return regmap_set_bits(state->regmap, REG_CR2, CR2_STBY);
> +}
> +
> +static int __maybe_unused max31760_resume(struct device *dev)
> +{
> +	struct max31760_state *state = dev_get_drvdata(dev);
> +
> +	return regmap_clear_bits(state->regmap, REG_CR2, CR2_STBY);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(max31760_pm_ops, max31760_suspend, max31760_resume);

DEFINE_SIMPLE_DEV_PM_OPS and drop maybe_unused.


> +
> +static struct i2c_driver max31760_driver = {
> +	.class		= I2C_CLASS_HWMON,
> +	.driver = {
> +		.name	= "max31760",
> +		.of_match_table = of_match_ptr(max31760_of_match),

of_match_ptr goes with maybe_unuses. You should see compile test warnings...


Best regards,
Krzysztof