On Thu, 15 Feb 2024 10:24:25 -0800
Jonathan LoBue <jlobue10@xxxxxxxxx> wrote:
> This patch adds a description of the duplicate ACPI identifier issue
> between devices using bmc150 and bmi323.
Title of patch doesn't reflect what is going on.
If there are no other changes needed I can tweak that whilst applying
to
iio: accel: bmc150: Document duplicate ACPI entries with bmi323 driver
>
> 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"},
