serial: max310x: Support IRQ sharing with other devices

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According to my chip's datasheet [1], the IRQ output is an open
collector pin which is suitable for sharing with other chips. The chip
also has a register which indicates which UART performed a change and
the driver checks that register already, so we have everything what is
needed to effectively share the IRQ GPIO.

[1] https://datasheets.maximintegrated.com/en/ds/MAX14830.pdf

Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jan Kundrát 2017-12-12 16:17:59 +01:00 • committed by Greg Kroah-Hartman

parent 8031358635

commit 78be70c824

1 changed files with 14 additions and 6 deletions

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drivers/tty/serial/max310x.c

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