tty: ar933x_uart: add device tree support and binding documentation
Modify the probe routine to get the port line number from device tree if the 'of_node' is populated in the platform device. The driver can be built as module, thus add an OF specific module device table as well to support module auto loading. This makes it possible to use the driver for AR9330 UART devices specified in device tree. Cc: devicetree@vger.kernel.org Signed-off-by: NGabor Juhos <juhosg@openwrt.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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