linux-kernel - Re: [PATCH v3 3/3] hwmon: emc2305: Use devm_thermal_of_cooling_device

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Message-ID: <23608097-f226-471b-b070-d3834e5c129b@roeck-us.net>
Date: Wed, 5 Mar 2025 08:54:27 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: florin.leotescu@....nxp.com, Jean Delvare <jdelvare@...e.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Michael Shych <michaelsh@...dia.com>,
 linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: viorel.suman@....com, carlos.song@....com,
 linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
 festevam@...il.com, Florin Leotescu <florin.leotescu@....com>
Subject: Re: [PATCH v3 3/3] hwmon: emc2305: Use
 devm_thermal_of_cooling_device_register

On 3/4/25 08:21, florin.leotescu@....nxp.com wrote:
> From: Florin Leotescu <florin.leotescu@....com>
> 
> This prepares emc2305 driver to use configuration from Device Tree nodes.
> Using devm_thermal_of_cooling_device_register also simplifies cleanup
> procedure, so we are able to remove the emc2305_unset_tz and emc2305_remove
> functions which are no longer used.
> 
> Signed-off-by: Florin Leotescu <florin.leotescu@....com>
> ---
>   drivers/hwmon/emc2305.c | 28 +++-------------------------
>   1 file changed, 3 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/hwmon/emc2305.c b/drivers/hwmon/emc2305.c
> index a236f27c75bc..5f3f06308826 100644
> --- a/drivers/hwmon/emc2305.c
> +++ b/drivers/hwmon/emc2305.c
> @@ -112,8 +112,6 @@ static char *emc2305_fan_name[] = {
>   	"emc2305_fan5",
>   };
>   
> -static void emc2305_unset_tz(struct device *dev);
> -
>   static int emc2305_get_max_channel(const struct emc2305_data *data)
>   {
>   	return data->pwm_num;
> @@ -293,8 +291,9 @@ static int emc2305_set_single_tz(struct device *dev, int idx)
>   	pwm = data->pwm_min[cdev_idx];
>   
>   	data->cdev_data[cdev_idx].cdev =
> -		thermal_cooling_device_register(emc2305_fan_name[idx], data,
> -						&emc2305_cooling_ops);
> +		devm_thermal_of_cooling_device_register(dev, dev->of_node,
> +							emc2305_fan_name[idx], data,
> +							&emc2305_cooling_ops);
>   
>   	if (IS_ERR(data->cdev_data[cdev_idx].cdev)) {
>   		dev_err(dev, "Failed to register cooling device %s\n", emc2305_fan_name[idx]);
> @@ -337,21 +336,9 @@ static int emc2305_set_tz(struct device *dev)
>   	return 0;
>   
>   thermal_cooling_device_register_fail:

This label is no longer necessary. Instead, any goto can be replaced with
an immediate return statement.

> -	emc2305_unset_tz(dev);
>   	return ret;
>   }
>   
> -static void emc2305_unset_tz(struct device *dev)
> -{
> -	struct emc2305_data *data = dev_get_drvdata(dev);
> -	int i;
> -
> -	/* Unregister cooling device. */
> -	for (i = 0; i < EMC2305_PWM_MAX; i++)
> -		if (data->cdev_data[i].cdev)
> -			thermal_cooling_device_unregister(data->cdev_data[i].cdev);
> -}
> -
>   static umode_t
>   emc2305_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel)
>   {
> @@ -599,14 +586,6 @@ static int emc2305_probe(struct i2c_client *client)
>   	return 0;
>   }
>   
> -static void emc2305_remove(struct i2c_client *client)
> -{
> -	struct device *dev = &client->dev;
> -
> -	if (IS_REACHABLE(CONFIG_THERMAL))
> -		emc2305_unset_tz(dev);
> -}
> -
>   static const struct of_device_id of_emc2305_match_table[] = {
>   	{ .compatible = "microchip,emc2301", },
>   	{ .compatible = "microchip,emc2302", },
> @@ -622,7 +601,6 @@ static struct i2c_driver emc2305_driver = {
>   		.of_match_table = of_emc2305_match_table,
>   	},
>   	.probe = emc2305_probe,
> -	.remove	  = emc2305_remove,
>   	.id_table = emc2305_ids,
>   };
>