firmware: arm_scmi: Fall back to ACPI HID when "compatible" is absent

scmi_debugfs_common_setup() uses the "compatible" property to
populate the debugfs transport type string. ACPI-described SCMI
devices do not provide that DT property, so the string remains
NULL and debugfs setup falls through the allocation failure path.

Check the property lookup result and use the ACPI HID as the
fallback transport type when an ACPI companion is present.

All supported DT SCMI platforms are expected to provide "compatible",
so the non-ACPI fallback is not needed for normal DT operation. Keep
the explicit "unknown" fallback anyway to avoid passing NULL to
kstrdup() if that assumption is ever violated.

Link: https://patch.msgid.link/20260915-acpi_scmi_pcc-v5-4-298579e9f359@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>

0 files changed, 0 insertions, 0 deletions