PXA serial ports have "standard" UART names (ttyS[0-3]), major
device number (4) and first minor device number (64) by default.

If the system has extra 8250 serial port hardware in addition
to onboard PXA serial ports, default settings produce a device
allocation conflict.

The patch provides a configuration option which can move onboard
ports out of the way of 8250_core by assigning a different (204)
major number and corresponding device names (ttySA[0-3]).

Signed-off-by: Sergei Ianovich <redacted>
---
 drivers/tty/serial/Kconfig | 19 +++++++++++++++++++
 drivers/tty/serial/pxa.c   | 22 ++++++++++++++++++----
 2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c

--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c

@@ -593,6 +593,20 @@ serial_pxa_type(struct uart_port *port)
 static struct uart_pxa_port *serial_pxa_ports[4];
 static struct uart_driver serial_pxa_reg;
 
+#ifndef CONFIG_SERIAL_PXA_AS_TTYSA
+
+#define PXA_TTY_NAME	"ttyS"
+#define PXA_TTY_MAJOR	TTY_MAJOR
+#define PXA_TTY_MINOR	64
+
+#else
+
+#define PXA_TTY_NAME	"ttySA"
+#define PXA_TTY_MAJOR	204
+#define PXA_TTY_MINOR	5
+
+#endif
+
 #ifdef CONFIG_SERIAL_PXA_CONSOLE
 
 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)

@@ -751,7 +765,7 @@ serial_pxa_console_setup(struct console *co, char *options)
 }
 
 static struct console serial_pxa_console = {
-	.name		= "ttyS",
+	.name		= PXA_TTY_NAME,
 	.write		= serial_pxa_console_write,
 	.device		= uart_console_device,
 	.setup		= serial_pxa_console_setup,

@@ -792,9 +806,9 @@ static struct uart_ops serial_pxa_pops = {
 static struct uart_driver serial_pxa_reg = {
 	.owner		= THIS_MODULE,
 	.driver_name	= "PXA serial",
-	.dev_name	= "ttyS",
-	.major		= TTY_MAJOR,
-	.minor		= 64,
+	.dev_name	= PXA_TTY_NAME,
+	.major		= PXA_TTY_MAJOR,
+	.minor		= PXA_TTY_MINOR,
 	.nr		= 4,
 	.cons		= PXA_CONSOLE,
 };