Commit 96c92d42 authored by Martin Kelly's avatar Martin Kelly Committed by Jonathan Cameron
Browse files

iio: imu: inv_mpu6050: add comment about frequencies 



Although the driver allows frequencies between 4 and 1000 Hz, only the
frequencies advertised in the available frequencies file are backed
properly by a low-pass filter to prevent aliasing, so it's best to use
them. Since this is not obvious to the user, add a comment explaining
what's going on.

Signed-off-by: default avatarMartin Kelly <mkelly@xevo.com>
Acked-by: default avatarJean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 9ff1d500

drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

+8 −1
Original line number Diff line number Diff line
@@ -798,7 +798,14 @@ static const struct iio_chan_spec inv_mpu_channels[] = { 
	INV_MPU6050_CHAN(IIO_ACCEL, IIO_MOD_Z, INV_MPU6050_SCAN_ACCL_Z),

};



/* constant IIO attribute */

/*

 * The user can choose any frequency between INV_MPU6050_MIN_FIFO_RATE and

 * INV_MPU6050_MAX_FIFO_RATE, but only these frequencies are matched by the

 * low-pass filter. Specifically, each of these sampling rates are about twice

 * the bandwidth of a corresponding low-pass filter, which should eliminate

 * aliasing following the Nyquist principle. By picking a frequency different

 * from these, the user risks aliasing effects.

 */

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("10 20 50 100 200 500");

static IIO_CONST_ATTR(in_anglvel_scale_available,

					  "0.000133090 0.000266181 0.000532362 0.001064724");