8250.c: support specifying DW APB UARTs in device platform_data

Allow the private_data field to be specified in platform_data for the
standard 8250/16550 UART.  This field is used by DW APB type UARTs and
without this patch it's only possible to set this field when registering
the port by hand.  If private_data is not set then the driver will
potentially oops with a NULL pointer dereference.

Signed-off-by: Will Newton <will.newton@gmail.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index afe0f6d9b9bc..00b65c0a82ca 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -23,6 +23,7 @@ struct plat_serial8250_port {
         resource_size_t mapbase;        /* resource base */
         unsigned int    irq;            /* interrupt number */
         unsigned int    uartclk;        /* UART clock rate */
+        void            *private_data;
         unsigned char   regshift;       /* register shift */
         unsigned char   iotype;         /* UPIO_* */
         unsigned char   hub6;