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serial: bcm63xx-uart: add polling support
The tty framework can support polling console to allow operation in situations where interrupts are turned off. Adding polling mode support allows using KGDB over serial console, Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com> Link: https://lore.kernel.org/r/20230322223956.84647-1-arend.vanspriel@broadcom.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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