drivers/sensor: lsm6dso: Prevent device entering I3C

On LSM6DSO sensor the INT1 pin is used for both generating the drdy interrupt and for switching to I3C hotjoin mode just after reset if it is at logical '1' level. It might happen that after a board reset the logical level '1' is preserved (maybe a level shifter) forcing the LSM6DSO to enter erroneously in I3C mode, breaking any attempt to communicate with it. (Fix zephyrproject-rtos#38902) Signed-off-by: Armando Visconti <[email protected]>
yegorich · Oct 7, 2021 · a2f3ea5 · a2f3ea5
1 parent 1e1c615
commit a2f3ea5
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/drivers/sensor/lsm6dso/lsm6dso.c b/drivers/sensor/lsm6dso/lsm6dso.c
@@ -753,6 +753,12 @@ static int lsm6dso_init_chip(const struct device *dev)
 		return -EIO;
 	}
 
+	/* I3C disable stay preserved after s/w reset */
+	if (lsm6dso_i3c_disable_set(ctx, LSM6DSO_I3C_DISABLE) < 0) {
+		LOG_DBG("Failed to disable I3C");
+		return -EIO;
+	}
+
 	/* reset device */
 	if (lsm6dso_reset_set(ctx, 1) < 0) {
 		return -EIO;