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From:   Marcin Wojtas <mw@semihalf.com>
To:     linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
        devel@acpica.org
Cc:     jaz@semihalf.com, gjb@semihalf.com, upstream@semihalf.com,
        Samer.El-Haj-Mahmoud@arm.com, jon@solid-run.com, tn@semihalf.com,
        rjw@rjwysocki.net, lenb@kernel.org, erik.kaneda@intel.com,
        robert.moore@intel.com, Marcin Wojtas <mw@semihalf.com>
Subject: [net-next: PATCH v3 1/1] ACPI: SPCR: Add new 16550-compatible Serial Port Subtype
Date:   Mon, 21 Jun 2021 22:04:59 +0200
Message-Id: <20210621200459.3558199-1-mw@semihalf.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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

Add its support in SPCR 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>
---
 include/acpi/actbl1.h | 1 +
 drivers/acpi/spcr.c   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index ce59903c2695..f746012eba8d 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -498,6 +498,7 @@ struct acpi_dbg2_device {
 #define ACPI_DBG2_ARM_SBSA_GENERIC  0x000E
 #define ACPI_DBG2_ARM_DCC           0x000F
 #define ACPI_DBG2_BCM2835           0x0010
+#define ACPI_DBG2_16550_WITH_GAS    0x0012
 
 #define ACPI_DBG2_1394_STANDARD     0x0000
 
diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
index 88460bacd5ae..25c2d0be953e 100644
--- 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:
-- 
2.29.0