Re: [PATCH v4 6/9] rtc: abx80x: use regmap instead of I2C specific API

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] Pointer target signedness mismatch due to passing `int *` to `regmap_read()`.
--

--- Patch [6]: [PATCH v4 6/9] rtc: abx80x: use regmap instead of I2C specific API ---
commit 2c13ab934066f6ede54c1bee1c9c8966213b138d
Author: Antoni Pokusinski <apokusinski01@gmail.com>
Subject: rtc: abx80x: use regmap instead of I2C specific API

This commit converts the ABX80x RTC driver to use regmap instead of i2c_smbus
functions. This enables future support for ABX81X SPI-based variants.

> diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
> index 12a4dbfec6396..5d41882f3c704 100644
> --- a/drivers/rtc/rtc-abx80x.c
> +++ b/drivers/rtc/rtc-abx80x.c
[ ... ]
> @@ -227,8 +230,7 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
>  
>  static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
>  {
> -	struct i2c_client *client = to_i2c_client(dev);
> -	struct abx80x_priv *priv = i2c_get_clientdata(client);
> +	struct abx80x_priv *priv = dev_get_drvdata(dev);
>  	unsigned char buf[8];
>  	int err, flags;

[ ... ]

> @@ -246,22 +248,22 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
>  
>  	guard(mutex)(&priv->lock);
>  
[ ... ]
>  
>  	/* Clear the OF bit of Oscillator Status Register */
> -	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
> -	if (flags < 0)
> -		return flags;
> +	err = regmap_read(priv->regmap, ABX8XX_REG_OSS, &flags);

[Severity: Low]
This isn't a bug, but could passing a pointer to the signed int flags into
regmap_read() trigger a pointer target signedness mismatch warning? 

Since regmap_read() expects an unsigned int pointer for its value parameter,
would it be better to change the declaration of flags in abx80x_rtc_set_time()
to unsigned int to avoid cluttering the build output?

> +	if (err < 0)
> +		return err;
>  
> -	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
> -					flags & ~ABX8XX_OSS_OF);
> +	err = regmap_write(priv->regmap, ABX8XX_REG_OSS,
> +			   flags & ~ABX8XX_OSS_OF);
>  	if (err < 0) {
> -		dev_err(&client->dev, "Unable to write oscillator status register\n");
> +		dev_err(dev, "Unable to write oscillator status register\n");
>  		return err;
>  	}

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260810193826.210683-1-apokusinski01@gmail.com?part=6