8250_pci: improve code comments and Kconfig help
The recent regression about NetMos 9835 Multi-I/O boards indicates that comment pointing to the parport_serial driver could be helpful. Signed-off-by: NStefan Seyfried <seife+kernel@b1-systems.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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