+ /* Make sure that alias ID is not taken by instance without alias */
+ bitmap_or(bitmap, bitmap, alias_bitmap, MAX_UART_INSTANCES);
+
+ dev_dbg(&pdev->dev, "Alias bitmap: %*pb\n",
+ MAX_UART_INSTANCES, bitmap);
+
+ /* Look for a serialN alias */
+ if (id < 0)
+ id = of_alias_get_id(pdev->dev.of_node, "serial");
+
+ if (id < 0) {
+ dev_warn(&pdev->dev,
+ "No serial alias passed. Using the first free id\n");
+
+ /*
+ * Start with id 0 and check if there is no serial0 alias
+ * which points to device which is compatible with this driver.
+ * If alias exists then try next free position.
+ */
+ id = 0;
+
+ for (;;) {
+ dev_info(&pdev->dev, "Checking id %d\n", id);
+ id = find_next_zero_bit(bitmap, MAX_UART_INSTANCES, id);
+
+ /* No free empty instance */
+ if (id == MAX_UART_INSTANCES) {
+ dev_err(&pdev->dev, "No free ID\n");
+ mutex_unlock(&bitmap_lock);
+ return -EINVAL;
+ }
+
+ dev_dbg(&pdev->dev, "The empty id is %d\n", id);
+ /* Check if ID is empty */
+ if (!test_and_set_bit(id, bitmap)) {
+ /* Break the loop if bit is taken */
+ dev_dbg(&pdev->dev,
+ "Selected ID %d allocation passed\n",
+ id);
+ break;
+ }
+ dev_dbg(&pdev->dev,
+ "Selected ID %d allocation failed\n", id);
+ /* if taking bit fails then try next one */
+ id++;
+ }
+ }
+
+ mutex_unlock(&bitmap_lock);
+
+ return id;
+}
+
+static int ulite_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct uartlite_data *pdata;
+ int irq, ret;
+ struct uart_driver *ulite_uart_driver;
+ char *driver_name;
+#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
+ struct console *ulite_console;
+#endif
+