Add a log for the device name on bitrate changes, without this it's very
hard to understand what's going on in a system with multiple bridges.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
Add PM hooks to release or reattach the serial ports from the bridge.
Does not save power per se but allows switch the lower level serial
ports for something else in runtime.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
Add a reusable uart-bridge driver that echoes data between two serial
devices. It's mainly meant to be used with one of the devices being an
USB CDC-ACM, the data is buffered, there's a pause feature to stop the
USB endpoint when the hardware UART is filling up to avoid overrun and
there's a helper function used to propagate the USB uart configuration
to the hardware one.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
