linux-kernel - Re: [PATCH 2/2] hwmon: (ina2xx) Add device tree support to pass alert polarity

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Date: Wed, 29 May 2024 09:09:17 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Amna Waseem <Amna.Waseem@...s.com>, Jean Delvare <jdelvare@...e.com>,
 Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel@...s.com
Subject: Re: [PATCH 2/2] hwmon: (ina2xx) Add device tree support to pass alert
 polarity

On 29/05/2024 08:07, Amna Waseem wrote:
>  
> +static int ina2xx_set_alert_polarity(struct ina2xx_data *data,
> +				     unsigned long val)
> +{
> +	int ret;
> +
> +	if (val > INT_MAX || !(val == 0 || val == 1))
> +		return -EINVAL;
> +
> +	mutex_lock(&data->config_lock);

Aren't you calling it before registering sysfs interface? Why do you
need mutex?

> +	ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
> +				 INA226_ALERT_POLARITY_MASK,
> +				 INA226_SHIFT_ALERT_POLARITY(val));
> +
> +	mutex_unlock(&data->config_lock);
> +	return ret;
> +}
> +
>  /*
>   * Calibration register is set to the best value, which eliminates
>   * truncation errors on calculating current register in hardware.
> @@ -659,6 +679,14 @@ static int ina2xx_probe(struct i2c_client *client)
>  	if (ret)
>  		return dev_err_probe(dev, ret, "failed to enable vs regulator\n");
>  
> +	if (!of_property_read_u32(dev->of_node, "alert-polarity", &val)) {
> +		ret = ina2xx_set_alert_polarity(data, val);
> +		if (ret < 0)
> +			return dev_err_probe(
> +				dev, ret,
> +				"failed to set APOL bit of Enable/Mask register\n");

That's odd wrapping. Please follow Linux coding style and align these.

Best regards,
Krzysztof