ACPI: SPCR: Add support for the new 16550-compatible Serial Port Subtype

The Microsoft Debug Port Table 2 (DBG2) specification revision
May 31, 2017 added definition of the 16550-compatible Serial Port
Subtype with parameters defined in Generic Address Structure (GAS) [1]

Add its support in the SPCR table parsing routine.

[1] https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/acpi-debug-port-table

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
index 88460ba..25c2d0b 100644 (file)
--- a/drivers/acpi/spcr.c
+++ b/drivers/acpi/spcr.c
@@ -136,6 +136,7 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool enable_console)
                break;
        case ACPI_DBG2_16550_COMPATIBLE:
        case ACPI_DBG2_16550_SUBSET:
+       case ACPI_DBG2_16550_WITH_GAS:
                uart = "uart";
                break;
        default: