> On Thu, 23 Sep 2021 11:08:24 +0200
> Lorenzo Bianconi <lorenzo@kernel.org> wrote:
> 
> > This patch does not introduce any logic change, just small code
> > rearrangement.
> Hi Lorenzo, 
> 
> Why?  I can make an educated guess that it is to put all the fifo related stuff
> in one place, but you probably need to state that in the patch description.

yes, it seems to me it is logically correct to have fifo configuration in
fifo_ops. I will post v2 adding this in the commit log.

Regards,
Lorenzo

> 
> Thanks,
> 
> Jonathan
> 
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > ---
> >  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h      |  4 ++--
> >  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 16 +++++++++-------
> >  2 files changed, 11 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > index 5ef55763a6cc..6ac4eac36458 100644
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > @@ -143,6 +143,7 @@ struct st_lsm6dsx_fs_table_entry {
> >   * @read_fifo: Read FIFO callback.
> >   * @fifo_th: FIFO threshold register info (addr + mask).
> >   * @fifo_diff: FIFO diff status register info (addr + mask).
> > + * @max_size: Sensor max fifo length in FIFO words.
> >   * @th_wl: FIFO threshold word length.
> >   */
> >  struct st_lsm6dsx_fifo_ops {
> > @@ -156,6 +157,7 @@ struct st_lsm6dsx_fifo_ops {
> >  		u8 addr;
> >  		u16 mask;
> >  	} fifo_diff;
> > +	u16 max_size;
> >  	u8 th_wl;
> >  };
> >  
> > @@ -271,7 +273,6 @@ struct st_lsm6dsx_ext_dev_settings {
> >   * @reset: register address for reset.
> >   * @boot: register address for boot.
> >   * @bdu: register address for Block Data Update.
> > - * @max_fifo_size: Sensor max fifo length in FIFO words.
> >   * @id: List of hw id/device name supported by the driver configuration.
> >   * @channels: IIO channels supported by the device.
> >   * @irq_config: interrupts related registers.
> > @@ -288,7 +289,6 @@ struct st_lsm6dsx_settings {
> >  	struct st_lsm6dsx_reg reset;
> >  	struct st_lsm6dsx_reg boot;
> >  	struct st_lsm6dsx_reg bdu;
> > -	u16 max_fifo_size;
> >  	struct {
> >  		enum st_lsm6dsx_hw_id hw_id;
> >  		const char *name;
> > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> > index db45f1fc0b81..0f54df85134a 100644
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> > @@ -102,7 +102,6 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  			.addr = 0x22,
> >  			.mask = BIT(6),
> >  		},
> > -		.max_fifo_size = 32,
> >  		.id = {
> >  			{
> >  				.hw_id = ST_LSM9DS1_ID,
> > @@ -194,6 +193,9 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  				.mask = BIT(4),
> >  			},
> >  		},
> > +		.fifo_ops = {
> > +			.max_size = 32,
> > +		},
> >  	},
> >  	{
> >  		.reset = {
> > @@ -208,7 +210,6 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  			.addr = 0x12,
> >  			.mask = BIT(6),
> >  		},
> > -		.max_fifo_size = 1365,
> >  		.id = {
> >  			{
> >  				.hw_id = ST_LSM6DS3_ID,
> > @@ -329,6 +330,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  				.addr = 0x3a,
> >  				.mask = GENMASK(11, 0),
> >  			},
> > +			.max_size = 1365,
> >  			.th_wl = 3, /* 1LSB = 2B */
> >  		},
> >  		.ts_settings = {
> > @@ -374,7 +376,6 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  			.addr = 0x12,
> >  			.mask = BIT(6),
> >  		},
> > -		.max_fifo_size = 682,
> >  		.id = {
> >  			{
> >  				.hw_id = ST_LSM6DS3H_ID,
> > @@ -495,6 +496,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  				.addr = 0x3a,
> >  				.mask = GENMASK(11, 0),
> >  			},
> > +			.max_size = 682,
> >  			.th_wl = 3, /* 1LSB = 2B */
> >  		},
> >  		.ts_settings = {
> > @@ -540,7 +542,6 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  			.addr = 0x12,
> >  			.mask = BIT(6),
> >  		},
> > -		.max_fifo_size = 682,
> >  		.id = {
> >  			{
> >  				.hw_id = ST_LSM6DSL_ID,
> > @@ -677,6 +678,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  				.addr = 0x3a,
> >  				.mask = GENMASK(10, 0),
> >  			},
> > +			.max_size = 682,
> >  			.th_wl = 3, /* 1LSB = 2B */
> >  		},
> >  		.ts_settings = {
> > @@ -759,7 +761,6 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  			.addr = 0x12,
> >  			.mask = BIT(6),
> >  		},
> > -		.max_fifo_size = 512,
> >  		.id = {
> >  			{
> >  				.hw_id = ST_LSM6DSR_ID,
> > @@ -910,6 +911,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  				.addr = 0x3a,
> >  				.mask = GENMASK(9, 0),
> >  			},
> > +			.max_size = 512,
> >  			.th_wl = 1,
> >  		},
> >  		.ts_settings = {
> > @@ -984,7 +986,6 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  			.addr = 0x12,
> >  			.mask = BIT(6),
> >  		},
> > -		.max_fifo_size = 512,
> >  		.id = {
> >  			{
> >  				.hw_id = ST_ASM330LHH_ID,
> > @@ -1119,6 +1120,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >  				.addr = 0x3a,
> >  				.mask = GENMASK(9, 0),
> >  			},
> > +			.max_size = 512,
> >  			.th_wl = 1,
> >  		},
> >  		.ts_settings = {
> > @@ -1603,7 +1605,7 @@ int st_lsm6dsx_set_watermark(struct iio_dev *iio_dev, unsigned int val)
> >  	struct st_lsm6dsx_hw *hw = sensor->hw;
> >  	int err;
> >  
> > -	if (val < 1 || val > hw->settings->max_fifo_size)
> > +	if (val < 1 || val > hw->settings->fifo_ops.max_size)
> >  		return -EINVAL;
> >  
> >  	mutex_lock(&hw->conf_lock);
>