Re: [PATCH v4 2/7] iio: pressure: bmp280: Add support for bmp280 soft reset

[Vasileios Amoiridis <vassilisamir@gmail.com>]

On Thu, Aug 29, 2024 at 03:10:22PM +0300, Andy Shevchenko wrote:
> On Wed, Aug 28, 2024 at 10:51:22PM +0200, Vasileios Amoiridis wrote:
> > The BM(P/E)28x devices have an option for soft reset which is also
> > recommended by the Bosch Sensortech BME2 Sensor API to be used before the
> > initial configuration of the device.
> 
> ...
> 
> > +static int bmp280_preinit(struct bmp280_data *data)
> > +{
> 
> With
> 
> 	struct device *dev = data->dev;
> 
> it will look better?
> 

Yes, that could be used.

> > +	unsigned int reg;
> > +	int ret;
> 
> > +	ret = regmap_write(data->regmap, BMP280_REG_RESET, BMP280_RST_SOFT_CMD);
> > +	if (ret)
> 
> > +		return dev_err_probe(data->dev, ret,
> > +				     "Failed to reset device.\n");
> 
> 		return dev_err_probe(dev, ret, "Failed to reset device.\n");
> 

ACK.

> > +	/*
> > +	 * According to the datasheet in Chapter 1: Specification, Table 2,
> > +	 * after resetting, the device uses the complete power-on sequence so
> > +	 * it needs to wait for the defined start-up time.
> > +	 */
> > +	fsleep(data->start_up_time);
> > +
> > +	ret = regmap_read(data->regmap, BMP280_REG_STATUS, &reg);
> > +	if (ret)
> 
> > +		return dev_err_probe(data->dev, ret,
> > +				     "Failed to read status register.\n");
> 
> 		return dev_err_probe(dev, ret, "Failed to read status register.\n");
> 

ACK.

> > +	if (reg & BMP280_REG_STATUS_IM_UPDATE)
> 
> > +		return dev_err_probe(data->dev, -EIO,
> > +				     "Failed to copy NVM contents.\n");
> 
> 		return dev_err_probe(dev, -EIO, "Failed to copy NVM contents.\n");
> 

ACK.

> > +	return 0;
> > +}
> 
> Yes, it's up to 84 characters long, but I think it improves readability.
> 

In all the previous cases though, shouldn't checkpatch.pl generate errors?
I didn't notice that they were below 80 chars and I never checked more
because checkpatch.pl didn't say anything...

> -- 
> With Best Regards,
> Andy Shevchenko
> 
>