sc16is7xx: Read the LSR register for basic device presence check

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Currently, the driver probes just fine and binds all its resources even
if the physical device is not present.

As the device lacks an identification register, let's at least read the
LSR register to check whether a device at the configured address responds
to the request at all.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Link: https://lore.kernel.org/r/20200521091152.404404-7-daniel@zonque.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Daniel Mack 2020-05-21 11:11:52 +02:00 • committed by Greg Kroah-Hartman

parent 2d12fc792c

commit 2aa916e67d

1 changed files with 11 additions and 0 deletions

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drivers/tty/serial/sc16is7xx.c

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