tty: Add support for the WCH384 4S multi-IO card

WCH384 4S board is a PCI-E card with 4 DB9 COM ports detected as
Serial controller: Device 1c00:3470 (rev 10) (prog-if 05 [16850])
Signed-off-by: Sergej Pupykin <ml@sergej.pp.ru>
Acked-by: Zany Yan <sirlight@cox.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_pci.c

@@ -1815,7 +1815,7 @@ pci_wch_ch353_setup(struct serial_private *priv,
 }
 
 static int
-pci_wch_ch382_setup(struct serial_private *priv,
+pci_wch_ch38x_setup(struct serial_private *priv,
                     const struct pciserial_board *board,
                     struct uart_8250_port *port, int idx)
 {
@@ -1880,6 +1880,7 @@ pci_wch_ch382_setup(struct serial_private *priv,
 
 #define PCIE_VENDOR_ID_WCH		0x1c00
 #define PCIE_DEVICE_ID_WCH_CH382_2S1P	0x3250
+#define PCIE_DEVICE_ID_WCH_CH384_4S	0x3470
 
 /* Unknown vendors/cards - this should not be in linux/pci_ids.h */
 #define PCI_SUBDEVICE_ID_UNKNOWN_0x1584	0x1584
@@ -2571,13 +2572,21 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 		.subdevice	= PCI_ANY_ID,
 		.setup		= pci_wch_ch353_setup,
 	},
-	/* WCH CH382 2S1P card (16750 clone) */
+	/* WCH CH382 2S1P card (16850 clone) */
 	{
 		.vendor         = PCIE_VENDOR_ID_WCH,
 		.device         = PCIE_DEVICE_ID_WCH_CH382_2S1P,
 		.subvendor      = PCI_ANY_ID,
 		.subdevice      = PCI_ANY_ID,
-		.setup          = pci_wch_ch382_setup,
+		.setup          = pci_wch_ch38x_setup,
+	},
+	/* WCH CH384 4S card (16850 clone) */
+	{
+		.vendor         = PCIE_VENDOR_ID_WCH,
+		.device         = PCIE_DEVICE_ID_WCH_CH384_4S,
+		.subvendor      = PCI_ANY_ID,
+		.subdevice      = PCI_ANY_ID,
+		.setup          = pci_wch_ch38x_setup,
 	},
 	/*
 	 * ASIX devices with FIFO bug
@@ -2876,6 +2885,7 @@ enum pci_board_num_t {
 	pbn_fintek_4,
 	pbn_fintek_8,
 	pbn_fintek_12,
+	pbn_wch384_4,
 };
 
 /*
@@ -3675,6 +3685,14 @@ static struct pciserial_board pci_boards[] = {
 		.base_baud	= 115200,
 		.first_offset	= 0x40,
 	},
+
+	[pbn_wch384_4] = {
+		.flags		= FL_BASE0,
+		.num_ports	= 4,
+		.base_baud      = 115200,
+		.uart_offset    = 8,
+		.first_offset   = 0xC0,
+	},
 };
 
 static const struct pci_device_id blacklist[] = {
@@ -3687,6 +3705,7 @@ static const struct pci_device_id blacklist[] = {
 	{ PCI_DEVICE(0x4348, 0x7053), }, /* WCH CH353 2S1P */
 	{ PCI_DEVICE(0x4348, 0x5053), }, /* WCH CH353 1S1P */
 	{ PCI_DEVICE(0x1c00, 0x3250), }, /* WCH CH382 2S1P */
+	{ PCI_DEVICE(0x1c00, 0x3470), }, /* WCH CH384 4S */
 };
 
 /*
@@ -5400,6 +5419,10 @@ static struct pci_device_id serial_pci_tbl[] = {
 		PCI_ANY_ID, PCI_ANY_ID,
 		0, 0, pbn_b0_bt_2_115200 },
 
+	{	PCIE_VENDOR_ID_WCH, PCIE_DEVICE_ID_WCH_CH384_4S,
+		PCI_ANY_ID, PCI_ANY_ID,
+		0, 0, pbn_wch384_4 },
+
 	/*
 	 * Commtech, Inc. Fastcom adapters
 	 */