serial: of_serial: Handle fifo-size property

This will reduce the need for extra types in 8250.c just
in case the fifo size differs from the standard.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/tty/serial/of-serial.txt b/Documentation/devicetree/bindings/tty/serial/of-serial.txt
index 8f01cb190f25..c13f0ce74da6 100644
--- a/Documentation/devicetree/bindings/tty/serial/of-serial.txt
+++ b/Documentation/devicetree/bindings/tty/serial/of-serial.txt
@@ -33,6 +33,7 @@ Optional properties:
   RTAS and should not be registered.
 - no-loopback-test: set to indicate that the port does not implements loopback
   test mode
+- fifo-size: the fifo size of the UART.
 
 Example:
 
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index b025d5438275..267711b5cb4d 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -97,6 +97,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
         if (of_property_read_u32(np, "reg-shift", &prop) == 0)
                 port->regshift = prop;
 
+        /* Check for fifo size */
+        if (of_property_read_u32(np, "fifo-size", &prop) == 0)
+                port->fifosize = prop;
+
         port->irq = irq_of_parse_and_map(np, 0);
         port->iotype = UPIO_MEM;
         if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {