[PATCH v2 1/4] ACPI/APMT: Use stable device ID

[Robin Murphy]

The APMT node format includes a unique identifier, so we can use this as
the platform device ID to give userspace stable and identifiable device
names, rather than auto numbering dependent on how the table is parsed.

Cc: Lorenzo Pieralisi <lpieralisi at kernel.org>
Cc: Hanjun Guo <guohanjun at huawei.com>
Cc: Sudeep Holla <sudeep.holla at kernel.org>
Reviewed-by: Ilkka Koskinen <ilkka at os.amperecomputing.com>
Signed-off-by: Robin Murphy <robin.murphy at arm.com>

---
v2: Handle and warn about unexpected signed overflow
---
 drivers/acpi/arm64/apmt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/arm64/apmt.c b/drivers/acpi/arm64/apmt.c
index bb010f6164e5..91fcdd289e63 100644
--- a/drivers/acpi/arm64/apmt.c
+++ b/drivers/acpi/arm64/apmt.c
@@ -76,10 +76,12 @@ static int __init apmt_add_platform_device(struct acpi_apmt_node *node,
 					   struct fwnode_handle *fwnode)
 {
 	struct platform_device *pdev;
-	int ret, count;
+	int ret, count, uid = node->id & INT_MAX;
 	struct resource res[DEV_MAX_RESOURCE_COUNT];
 
-	pdev = platform_device_alloc(DEV_NAME, PLATFORM_DEVID_AUTO);
+	if (uid != node->id)
+		pr_warn("Unexpectedly large UID 0x%x, truncated to 0x%x\n", node->id, uid);
+	pdev = platform_device_alloc(DEV_NAME, uid);
 	if (!pdev)
 		return -ENOMEM;
 
-- 
2.54.0.dirty