ns16550: add support for ASIX AX99100 PCIe Multi-I/O controller

Add a PCI device table entry and matching parameter for the ASIX
AX99100 PCIe to Multi-I/O controller [125b:9910]. Each port on the
chip is a standalone PCI function, with UART registers on its I/O
BAR0.

Signed-off-by: Jiaqing Zhao <Zhao.Jiaqing@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

xen/drivers/char/ns16550.c

@@ -97,6 +97,7 @@ struct ns16550_config {
         param_exar_xr17v358,
         param_intel_lpss,
         param_wch_ch382,
+        param_asix,
     } param;
 };
 
@@ -900,6 +901,14 @@ static const struct ns16550_config_param __initconst uart_param[] = {
         .bar0 = true,
         .max_ports = 2,
     },
+    [param_asix] = {
+        .base_baud = 115200,
+        .reg_width = 1,
+        .fifo_size = 256,
+        .lsr_mask = UART_LSR_THRE,
+        .bar0 = true,
+        .max_ports = 1,
+    },
 };
 
 static const struct ns16550_config __initconst uart_config[] =
@@ -1240,6 +1249,12 @@ static const struct ns16550_config __initconst uart_config[] =
         .dev_id = 0x3253,
         .param = param_wch_ch382
     },
+    /* ASIX AX99100 PCIe to Multi I/O Controller */
+    {
+        .vendor_id = PCI_VENDOR_ID_ASIX,
+        .dev_id = 0x9910,
+        .param = param_asix
+    },
 };
 
 static int __init

xen/include/xen/pci_ids.h

@@ -5,6 +5,8 @@
 
 #define PCI_VENDOR_ID_NVIDIA             0x10de
 
+#define PCI_VENDOR_ID_ASIX               0x125b
+
 #define PCI_VENDOR_ID_PERICOM            0x12d8
 
 #define PCI_VENDOR_ID_EXAR               0x13a8