On Tue 2025-01-07 22:33:01, John Ogness wrote: > Implement the necessary callbacks to switch the 8250 console driver > to perform as an nbcon console. > > Add implementations for the nbcon console callbacks: > > ->write_atomic() > ->write_thread() > ->device_lock() > ->device_unlock() > > and add CON_NBCON to the initial @flags. > > All register access in the callbacks are within unsafe sections. > The ->write_atomic() and ->write_thread() callbacks allow safe > handover/takeover per byte and add a preceding newline if they > take over from another context mid-line. > > For the ->write_atomic() callback, a new irq_work is used to defer > modem control since it may be called from a context that does not > allow waking up tasks. > > Note: A new __serial8250_clear_IER() is introduced for direct > clearing of UART_IER. This will allow to restore the lockdep > check to serial8250_clear_IER() in a follow-up commit. > > Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx> It looks good and seems to work fine: Reviewed-by: Petr Mladek <pmladek@xxxxxxxx> Tested-by: Petr Mladek <pmladek@xxxxxxxx> Best Regards, Petr
