[PATCH v6 2/2] iio: imu: bmi323: Add ACPI Match Table

[Jonathan LoBue <jlobue10@gmail.com>]

From: jlobue10 <jlobue10@gmail.com>

Adds the ACPI match table for ASUS ROG ALLY to load the bmi323
driver with an ACPI match of "BOSC0200", and a comment about duplicate
ACPI identifiers between devices using the bmc150 and bmi323 chips.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Co-developed-by: Luke D. Jones <luke@ljones.dev>
Signed-off-by: Luke D. Jones <luke@ljones.dev>
Co-developed-by: Denis Benato <benato.denis96@gmail.com>
Signed-off-by: Denis Benato <benato.denis96@gmail.com>
Co-developed-by: Antheas Kapenekakis <lkml@antheas.dev>
Signed-off-by: Antheas Kapenekakis <lkml@antheas.dev>
Signed-off-by: Jonathan LoBue <jlobue10@gmail.com>
---
 drivers/iio/imu/bmi323/bmi323_i2c.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/iio/imu/bmi323/bmi323_i2c.c b/drivers/iio/imu/bmi323/bmi323_i2c.c
index 20a8001b9956..f7550503e47e 100644
--- a/drivers/iio/imu/bmi323/bmi323_i2c.c
+++ b/drivers/iio/imu/bmi323/bmi323_i2c.c
@@ -93,6 +93,25 @@ static int bmi323_i2c_probe(struct i2c_client *i2c)
 	return bmi323_core_probe(dev);
 }
 
+static const struct acpi_device_id bmi323_acpi_match[] = {
+	/*
+ 	 * The "BOSC0200" identifier used here is not unique to bmi323 devices.
+ 	 * The same "BOSC0200" identifier is found in the ACPI tables of devices
+ 	 * using the bmc150 chip. This creates a conflict with duplicate ACPI
+ 	 * identifiers which multiple drivers want to use. If a non-bmi323 device
+ 	 * starts to load with this "BOSC0200" ACPI match here, then the chip
+ 	 * ID check portion should fail because the chip IDs received (via i2c) are
+ 	 * unique between bmc150 and bmi323 and the driver should relinquish the
+ 	 * device. If and when a different driver (such as bmc150) starts to load
+ 	 * with the "BOSC0200" ACPI match, a short reset should ensure that the
+ 	 * device is not in a bad state during that driver initialization. This
+ 	 * device reset does occur in both the bmi323 and bmc150 init sequences.
+ 	 */
+	{ "BOSC0200" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, bmi323_acpi_match);
+
 static const struct i2c_device_id bmi323_i2c_ids[] = {
 	{ "bmi323" },
 	{ }
@@ -109,6 +128,7 @@ static struct i2c_driver bmi323_i2c_driver = {
 	.driver = {
 		.name = "bmi323",
 		.of_match_table = bmi323_of_i2c_match,
+		.acpi_match_table = bmi323_acpi_match,
 	},
 	.probe = bmi323_i2c_probe,
 	.id_table = bmi323_i2c_ids,
-- 
2.43.0