-void NS16550_init (NS16550_t com_port, int baud_divisor);
-void NS16550_putc (NS16550_t com_port, char c);
-char NS16550_getc (NS16550_t com_port);
-int NS16550_tstc (NS16550_t com_port);
-void NS16550_reinit (NS16550_t com_port, int baud_divisor);
+void NS16550_init(NS16550_t com_port, int baud_divisor);
+void NS16550_putc(NS16550_t com_port, char c);
+char NS16550_getc(NS16550_t com_port);
+int NS16550_tstc(NS16550_t com_port);
+void NS16550_reinit(NS16550_t com_port, int baud_divisor);
+
+/**
+ * ns16550_calc_divisor() - calculate the divisor given clock and baud rate
+ *
+ * Given the UART input clock and required baudrate, calculate the divisor
+ * that should be used.
+ *
+ * @port: UART port
+ * @clock: UART input clock speed in Hz
+ * @baudrate: Required baud rate
+ * @return baud rate divisor that should be used
+ */
+int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate);
+
+/**
+ * ns16550_serial_ofdata_to_platdata() - convert DT to platform data
+ *
+ * Decode a device tree node for an ns16550 device. This includes the
+ * register base address and register shift properties. The caller must set
+ * up the clock frequency.
+ *
+ * @dev: dev to decode platform data for
+ * @return: 0 if OK, -EINVAL on error
+ */
+int ns16550_serial_ofdata_to_platdata(struct udevice *dev);
+
+/**
+ * ns16550_serial_probe() - probe a serial port
+ *
+ * This sets up the serial port ready for use, except for the baud rate
+ * @return 0, or -ve on error
+ */
+int ns16550_serial_probe(struct udevice *dev);
+
+/**
+ * struct ns16550_serial_ops - ns16550 serial operations
+ *
+ * These should be used by the client driver for the driver's 'ops' member
+ */
+extern const struct dm_serial_ops ns16550_serial_ops;