serial: Fix UPIO_MEM comment

The original semantics of UPIO_MEM did not include the notion of bitness
and endianness; different drivers used UPIO_MEM to refer to their original
mmio bitness/endianness. For example, for the 8250 driver this is 8-bit LE
but for the amba-pl011 driver this is 16-bit LE. Since UPIO_* values are
userspace ABI via TIOCGSERIAL/TIOCSSERIAL ioctls, the original meaning of
UPIIO_MEM must remain as it was: the original mmio stride/width/endianness
of the driver.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 35aa87b96b711abad36a2a5c4ef311fb12e5343f..e03d6ba5e5b428849b6a269fc6db72a7563b4dc9 100644 (file)
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -145,7 +145,7 @@ struct uart_port {
 
 #define UPIO_PORT              (SERIAL_IO_PORT)        /* 8b I/O port access */
 #define UPIO_HUB6              (SERIAL_IO_HUB6)        /* Hub6 ISA card */
-#define UPIO_MEM               (SERIAL_IO_MEM)         /* 8b MMIO access */
+#define UPIO_MEM               (SERIAL_IO_MEM)         /* driver-specific */
 #define UPIO_MEM32             (SERIAL_IO_MEM32)       /* 32b little endian */
 #define UPIO_AU                        (SERIAL_IO_AU)          /* Au1x00 and RT288x type IO */
 #define UPIO_TSI               (SERIAL_IO_TSI)         /* Tsi108/109 type IO */