tty: amba-pl011: use iotype instead of access_32b to track 32-bit I/O

Instead of defining a new field in the uart_amba_port structure, use the
existing iotype field of the uart_port structure, which is intended for
this purpose.  If we need to use 32-bit register access, we set iotype
to UPIO_MEM32, otherwise we set it to UPIO_MEM.

For early console, specify the "mmio32" option on the kernel command-line.
Example:

        earlycon=pl011,mmio32,0x3ced1000

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 054e11d33b6b..654c547b9fc9 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1003,10 +1003,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         unspecified, the h/w is not initialized.
 
                 pl011,<addr>
+                pl011,mmio32,<addr>
                         Start an early, polled-mode console on a pl011 serial
                         port at the specified address. The pl011 serial port
                         must already be setup and configured. Options are not
-                        yet supported.
+                        yet supported.  If 'mmio32' is specified, then only
+                        the driver will use only 32-bit accessors to read/write
+                        the device registers.
 
                 msm_serial,<addr>
                         Start an early, polled-mode console on an msm serial