[PATCH 3/4] hw: arm: acpi: add UART clock frequency to SPCR table

[Vadim Chichikalyuk <chichikalyuk@gmail.com>]

On the ARM virt machine, there is currently no way to programmatically
discover the frequency of the UART reference clock solely through the use of
UEFI/ACPI (without the DTB). The SPCR table can include this information
as of revision 3.

Bump the revision to 3 and add the clock frequency of 24 MHz to the table.

Signed-off-by: Vadim Chichikalyuk <chichikalyuk@gmail.com>
---
 hw/arm/virt-acpi-build.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index b01fc4f8ef..029cbb37f7 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -559,12 +559,13 @@ spcr_setup(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
         .pci_function = 0,
         .pci_flags = 0,
         .pci_segment = 0,
+        .uart_clk_freq = 24000000, /* 24MHz */
     };
     /*
-     * Passing NULL as the SPCR Table for Revision 2 doesn't support
+     * Passing NULL as the SPCR Table for Revision 3 doesn't support
      * NameSpaceString.
      */
-    build_spcr(table_data, linker, &serial, 2, vms->oem_id, vms->oem_table_id,
+    build_spcr(table_data, linker, &serial, 3, vms->oem_id, vms->oem_table_id,
                NULL);
 }
 
-- 
2.39.5 (Apple Git-154)