tree da8d0de101959f318a438d9e4924c39b4c6ffbd0
parent 616ea8d2d644b93ec634a3cb97e04f1ec3b0a491
author Max Filippov <jcmvbkbc@gmail.com> 1442924432 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1443982265 +0100

serial_core: support native endianness

There are three natural ways in which devices may be wired to the system:
little endian (device receives correctly ordered bits of a word written
by little-endian CPU to its register, but big-endian CPU needs to swap
bytes of a word before writing it), big endian (same, but with big-endian
CPU in more favourable position) and native endian (CPU of either
endianness may do word-sized I/O without need for byteswapping).

Adding an option for native endianness allows using single kernel command
line for boards with native-endian serial ports on bi-endian
architectures. This goes in parallel with 'native-endian' DTS attribute.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>