This patch adds a description of the duplicate ACPI identifier issue
between devices using bmc150 and bmi323.
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Co-developed-by: Luke D. Jones <luke@xxxxxxxxxx>
Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
Co-developed-by: Denis Benato <benato.denis96@xxxxxxxxx>
Signed-off-by: Denis Benato <benato.denis96@xxxxxxxxx>
Co-developed-by: Antheas Kapenekakis <lkml@xxxxxxxxxxx>
Signed-off-by: Antheas Kapenekakis <lkml@xxxxxxxxxxx>
Signed-off-by: Jonathan LoBue <jlobue10@xxxxxxxxx>
---
drivers/iio/accel/bmc150-accel-i2c.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/iio/accel/bmc150-accel-i2c.c b/drivers/iio/accel/bmc150-accel-i2c.c
index ee1ba134ad42..353271e23235 100644
--- a/drivers/iio/accel/bmc150-accel-i2c.c
+++ b/drivers/iio/accel/bmc150-accel-i2c.c
@@ -224,6 +224,19 @@ static const struct acpi_device_id bmc150_accel_acpi_match[] = {
{"BMA250E"},
{"BMC150A"},
{"BMI055A"},
+ /*
+ * The "BOSC0200" identifier used here is not unique to devices using
+ * bmc150. The same "BOSC0200" identifier is found in the ACPI tables of
+ * the ASUS ROG ALLY and Ayaneo AIR Plus which both use a Bosch BMI323
+ * chip. This creates a conflict with duplicate ACPI identifiers which
+ * multiple drivers want to use. Fortunately, when the bmc150 driver
+ * starts to load on the ASUS ROG ALLY, the chip ID check portion fails
+ * (correctly) because the chip IDs received (via i2c) are unique between
+ * bmc150 and bmi323 and a dmesg output similar to this:
+ * "bmc150_accel_i2c i2c-BOSC0200:00: Invalid chip 0" can be seen.
+ * This allows the bmi323 driver to take over for ASUS ROG ALLY, and
+ * other devices using the bmi323 chip.
+ */
{"BOSC0200"},
{"BSBA0150"},
{"DUAL250E"},
--
2.43.0
