linux-kernel - Re: [PATCH 1/2] drivers: iio: pressure: Fixes BMP38x and BMP390 SPI support

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Date: Sat, 24 Feb 2024 17:58:51 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Vasileios Amoiridis <vassilisamir@...il.com>, lars@...afoo.de,
 ang.iglesiasg@...il.com, linus.walleij@...aro.org,
 semen.protsenko@...aro.org, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drivers: iio: pressure: Fixes BMP38x and BMP390 SPI
 support

On Tue, 20 Feb 2024 21:57:35 +0200
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> On Tue, Feb 20, 2024 at 07:41:24PM +0100, Vasileios Amoiridis wrote:
> > According to the datasheet of BMP38x and BMP390 devices, for an SPI
> > read operation the first byte that is returned needs to be dropped,
> > and the rest of the bytes are the actual data returned from the
> > sensor.  
> 
> ...
> 
> > +static int bmp380_regmap_spi_read(void *context, const void *reg,
> > +				  size_t reg_size, void *val, size_t val_size)
> > +{
> > +	struct spi_device *spi = to_spi_device(context);
> > +	u8 rx_buf[4];
> > +	ssize_t status;
> > +
> > +	/*
> > +	 * Maximum number of consecutive bytes read for a temperature or
> > +	 * pressure measurement is 3.
> > +	 */
> > +	if (val_size > 3)
> > +		return -EINVAL;  
> 
> I would add a blank line here.
> 
> > +	/*
> > +	 * According to the BMP3xx datasheets, for a basic SPI read opertion,
> > +	 * the first byte needs to be dropped and the rest are the requested
> > +	 * data.
> > +	 */
> > +	status = spi_write_then_read(spi, reg, 1, rx_buf, val_size + 1);
> > +	if (status)
> > +		return status;
> > +
> > +	memcpy(val, rx_buf + 1, val_size);
> > +
> > +	return 0;
> > +}  
> 
> With above and bits.h location being addressed
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
I'd picked up previous version and tweaked it for the header being first.
Now updated the spacing above and added your tag.

Only did this rebase because it was the top of my fixes tree.