Re: [PATCH v2 1/2] iio: accel: kionix-kx022a: use scan struct for one-shot and trigger reads

[Andy Shevchenko <andriy.shevchenko@intel.com>]

On Tue, Aug 18, 2026 at 10:51:21PM +0100, Gabriel Rondon wrote:
> The driver kept two separate staging areas that hold the same thing:
> buffer[8], a DMA-aligned area used by the one-shot read in
> kx022a_get_axis() and by the triggered handler, and the scan struct,
> used by the FIFO flush path. Both are three __le16 channels plus room
> for the timestamp.
> 
> Drop buffer and route the one-shot read and the triggered handler
> through scan.channels, so the driver has a single staging area. Move the
> IIO_DMA_MINALIGN alignment onto scan, since it now backs the regmap bulk
> reads that buffer used to.
> 
> No functional change. get_axis() only runs via read_raw() under
> iio_device_claim_direct(), so it cannot run while the triggered buffer is
> active, and the triggered handler only runs while it is; the two never
> touch scan concurrently, exactly as they previously shared buffer.

...

> static int kx022a_get_axis(struct kx022a_data *data,

>  {

I would rather do this

	__le16 *buf = &data->scan.channels[0];

>  	int ret;
>  
> -	ret = regmap_bulk_read(data->regmap, chan->address, &data->buffer[0],
> -			       sizeof(__le16));
> +	ret = regmap_bulk_read(data->regmap, chan->address,
> +			       &data->scan.channels[0], sizeof(__le16));

	ret = regmap_bulk_read(data->regmap, chan->address, buf, sizeof(*buf));

>  	if (ret)
>  		return ret;
>  
> -	*val = (s16)le16_to_cpu(data->buffer[0]);
> +	*val = (s16)le16_to_cpu(data->scan.channels[0]);

	*val = (s16)le16_to_cpup(buf);

-- 
With Best Regards,
Andy Shevchenko