tty: serial: 8250_core: allow to overwrite & export serial8250_startup()

The OMAP version of the 8250 can actually use 1:1 serial8250_startup().
However it needs to be extended by a wake up irq which should to be
requested & enabled at ->startup() time and disabled at ->shutdown() time.

v2…v3: properly copy callbacks
v1…v2: add shutdown callback

Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 6dd671765312..6fc9d7bee05e 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -124,6 +124,8 @@ extern void serial8250_early_out(struct uart_port *port, int offset, int value);
 extern int setup_early_serial8250_console(char *cmdline);
 extern void serial8250_do_set_termios(struct uart_port *port,
                 struct ktermios *termios, struct ktermios *old);
+extern int serial8250_do_startup(struct uart_port *port);
+extern void serial8250_do_shutdown(struct uart_port *port);
 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
                              unsigned int oldstate);
 extern int fsl8250_handle_irq(struct uart_port *port);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 8cb267b1fcd5..3bd7d55eebce 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -122,6 +122,8 @@ struct uart_port {
         void                    (*set_termios)(struct uart_port *,
                                                struct ktermios *new,
                                                struct ktermios *old);
+        int                     (*startup)(struct uart_port *port);
+        void                    (*shutdown)(struct uart_port *port);
         int                     (*handle_irq)(struct uart_port *);
         void                    (*pm)(struct uart_port *, unsigned int state,
                                       unsigned int old);