[xen master] ns16550: add support for WCH CH382 serial adapters

[patchbot@xxxxxxx]

commit 6029b683321382c4bf4dec859980c01ff3109561
Author:     Jiaqing Zhao <Zhao.Jiaqing@xxxxxxx>
AuthorDate: Thu Jul 2 08:45:43 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jul 2 08:45:43 2026 +0200

    ns16550: add support for WCH CH382 serial adapters
    
    Add support for the WCH (Nanjing Qinheng Microelectronics Co., Ltd.)
    CH382 PCIe dual port serial adapter. The CH382 is available in two
    variants:
     - CH382 2S   [1c00:3253]: 2 serial ports
     - CH382 2S1P [1c00:3250]: 2 serial ports + 1 parallel port
    
    This chip uses IO BAR0, base baud rate 115200, ports starting at offset
    0xc0 and spaced 8 bytes apart, and a 256-byte FIFO. [1]
    
    [1] https://www.wch-ic.com/downloads/CH382DS1_PDF.html
    
    Signed-off-by: Jiaqing Zhao <Zhao.Jiaqing@xxxxxxx>
    Reviewed-by: Denis Mukhin <dmukhin@xxxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/drivers/char/ns16550.c | 23 +++++++++++++++++++++++
 xen/include/xen/pci_ids.h  |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 48c9016246..916bb7325e 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -96,6 +96,7 @@ struct ns16550_config {
         param_exar_xr17v354,
         param_exar_xr17v358,
         param_intel_lpss,
+        param_wch_ch382,
     } param;
 };
 
@@ -889,6 +890,16 @@ static const struct ns16550_config_param __initconst 
uart_param[] = {
         .mmio = true,
         .max_ports = 1,
     },
+    [param_wch_ch382] = {
+        .base_baud = 115200,
+        .first_offset = 0xc0,
+        .uart_offset = 8,
+        .reg_width = 1,
+        .fifo_size = 256,
+        .lsr_mask = UART_LSR_THRE,
+        .bar0 = true,
+        .max_ports = 2,
+    },
 };
 
 static const struct ns16550_config __initconst uart_config[] =
@@ -1217,6 +1228,18 @@ static const struct ns16550_config __initconst 
uart_config[] =
         .dev_id = 0x7adc,
         .param = param_intel_lpss
     },
+    /* WCH CH382 2S1P */
+    {
+        .vendor_id = PCI_VENDOR_ID_WCHIC,
+        .dev_id = 0x3250,
+        .param = param_wch_ch382
+    },
+    /* WCH CH382 2S */
+    {
+        .vendor_id = PCI_VENDOR_ID_WCHIC,
+        .dev_id = 0x3253,
+        .param = param_wch_ch382
+    },
 };
 
 static int __init
diff --git a/xen/include/xen/pci_ids.h b/xen/include/xen/pci_ids.h
index 5884a20b8f..15e938225c 100644
--- a/xen/include/xen/pci_ids.h
+++ b/xen/include/xen/pci_ids.h
@@ -13,6 +13,8 @@
 
 #define PCI_VENDOR_ID_BROADCOM           0x14e4
 
+#define PCI_VENDOR_ID_WCHIC              0x1c00
+
 #define PCI_VENDOR_ID_INTEL              0x8086
 
 #endif /* XEN_PCI_IDS_H */
--
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