[PATCH v2 2/2] iio: imu: bmi323: Add and enable ACPI Match Table

[Jonathan LoBue <jlobue10@gmail.com>]

This patch adds the ACPI match table for ASUS ROG ALLY to load the bmi323
driver with an ACPI match of "BOSC0200".

Co-developed-by: Jonathan LoBue <jlobue10@gmail.com>
Signed-off-by: Jonathan LoBue <jlobue10@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>
---

Formatting fixes, removed duplicate header, and removed ACPI_PTR
from previous submission.

Added an explanation of the duplicate ACPI identifier issue between
devices using bmc150 and bmi323.

 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..22826a2efc6f 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);
 }
 
+/*
+ * The "BOSC0200" ACPI identifier used here in the bmi323 driver is not
+ * unique to bmi323 devices. The same "BOSC0200" identifier is found in
+ * 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 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.
+ */
+
+static const struct acpi_device_id bmi323_acpi_match[] = {
+	{ "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