Hello Jean-Baptiste, thank you for your answer I work actually with a nvidia-provided 4.9 kernel that I cannot change. Up to now I have incorporated the mpu9250 related patches up to v4.12. Do you think I should simply replace the inv_mpu6050 driver files of v4.9 by their v5.11 (or newer) counterparts ? Thanks Philippe On Thu, Mar 04, 2021 at 09:12:47AM +0000, Jean-Baptiste Maneyrol wrote: > Hello Philippe, > > I would recommend letting mpu9250 chip drives the magnetometer instead of using the ak8963 driver. > > This is simpler to use and guarantees a good synchronization between all sensors and no possible latency coming from kernel scheduling when polling the magnetometer. And it enables the use of spi bus for connecting the device. > > You just need to define mpu9250 dts without an i2c-gate, and delete all definition of ak8963 chip. > > Best regards, > JB > > > From: Philippe De Muyter <phdm@xxxxxxx> > Sent: Wednesday, March 3, 2021 16:31 > To: linux-iio@xxxxxxxxxxxxxxx <linux-iio@xxxxxxxxxxxxxxx> > Subject: invensense mpu9250 ak8963 and devicetree > > Hello, > > I am trying to use a mpu9250 imu, but I have trouble with the ak8963 part. > > Currently, ak8975_probe fails in this code : > > /* Fetch the regulators */ > data->vdd = devm_regulator_get(&client->dev, "vdd"); > if (IS_ERR(data->vdd)) > return PTR_ERR(data->vdd); > data->vid = devm_regulator_get(&client->dev, "vid"); > if (IS_ERR(data->vid)) > return PTR_ERR(data->vid); > > but Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml > says : > > vdd-supply: > description: | > an optional regulator that needs to be on to provide VDD power to > the sensor. > > I have no vdd or vdd-supply property in my ak8963 description. > > Is that unrelated ? > > What should I write in my dts file for this ak8963 embedded in a mpu9250 ? > > Thanks in advance > > Philippe > > -- > Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles
