Re: [PATCH] iio: imu: st_lsm6dsx: enable 833Hz sample frequency for tagged sensors

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 24 Apr 2020 12:44:38 +0200
Lorenzo Bianconi <lorenzo@kernel.org> wrote:

> Enable 833Hz ODR for sensors that supports tagged hw FIFO:
> - LSM6DSO/LSM6DSOX
> - LSM6DSR/LSM6DSRX
> - ASM330LHH
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Would ideally have liked a little more info on the 'why'.  Was this previously
capped by practicality - i.e. not possible to read faster or is there
something else going on here?

Don't really need to know for the applied patch though so
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 21 +++++++++++++-------
>  1 file changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 84d219ae6aee..e6339bbb4469 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -27,7 +27,8 @@
>   *   - FIFO size: 4KB
>   *
>   * - LSM6DSO/LSM6DSOX/ASM330LHH/LSM6DSR/ISM330DHCX:
> - *   - Accelerometer/Gyroscope supported ODR [Hz]: 13, 26, 52, 104, 208, 416
> + *   - Accelerometer/Gyroscope supported ODR [Hz]: 13, 26, 52, 104, 208, 416,
> + *     833
>   *   - Accelerometer supported full-scale [g]: +-2/+-4/+-8/+-16
>   *   - Gyroscope supported full-scale [dps]: +-125/+-245/+-500/+-1000/+-2000
>   *   - FIFO size: 3KB
> @@ -791,7 +792,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.odr_avl[3] = { 104000, 0x04 },
>  				.odr_avl[4] = { 208000, 0x05 },
>  				.odr_avl[5] = { 416000, 0x06 },
> -				.odr_len = 6,
> +				.odr_avl[6] = { 833000, 0x07 },
> +				.odr_len = 7,
>  			},
>  			[ST_LSM6DSX_ID_GYRO] = {
>  				.reg = {
> @@ -804,7 +806,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.odr_avl[3] = { 104000, 0x04 },
>  				.odr_avl[4] = { 208000, 0x05 },
>  				.odr_avl[5] = { 416000, 0x06 },
> -				.odr_len = 6,
> +				.odr_avl[6] = { 833000, 0x07 },
> +				.odr_len = 7,
>  			},
>  		},
>  		.fs_table = {
> @@ -994,7 +997,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.odr_avl[3] = { 104000, 0x04 },
>  				.odr_avl[4] = { 208000, 0x05 },
>  				.odr_avl[5] = { 416000, 0x06 },
> -				.odr_len = 6,
> +				.odr_avl[6] = { 833000, 0x07 },
> +				.odr_len = 7,
>  			},
>  			[ST_LSM6DSX_ID_GYRO] = {
>  				.reg = {
> @@ -1007,7 +1011,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.odr_avl[3] = { 104000, 0x04 },
>  				.odr_avl[4] = { 208000, 0x05 },
>  				.odr_avl[5] = { 416000, 0x06 },
> -				.odr_len = 6,
> +				.odr_avl[6] = { 833000, 0x07 },
> +				.odr_len = 7,
>  			},
>  		},
>  		.fs_table = {
> @@ -1171,7 +1176,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.odr_avl[3] = { 104000, 0x04 },
>  				.odr_avl[4] = { 208000, 0x05 },
>  				.odr_avl[5] = { 416000, 0x06 },
> -				.odr_len = 6,
> +				.odr_avl[6] = { 833000, 0x07 },
> +				.odr_len = 7,
>  			},
>  			[ST_LSM6DSX_ID_GYRO] = {
>  				.reg = {
> @@ -1184,7 +1190,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.odr_avl[3] = { 104000, 0x04 },
>  				.odr_avl[4] = { 208000, 0x05 },
>  				.odr_avl[5] = { 416000, 0x06 },
> -				.odr_len = 6,
> +				.odr_avl[6] = { 833000, 0x07 },
> +				.odr_len = 7,
>  			},
>  		},
>  		.fs_table = {