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authorTimur Tabi <timur@codeaurora.org>2016-01-04 22:37:42 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-01-07 06:02:45 +0100
commit3b78fae793c027140cfe635ef216bf60aa6498f4 (patch)
tree3b0157674a758482d9f3c773f3bdcb78990a9774 /Documentation/kernel-parameters.txt
parenttty: amba-pl011: fix earlycon register offsets (diff)
downloadlinux-3b78fae793c027140cfe635ef216bf60aa6498f4.tar.xz
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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>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt5
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