UART_RX_IRQ
ret = devm_request_irq(port->dev, mvuart->irq[UART_RX_IRQ],
mvuart->irq[UART_RX_IRQ]);
devm_free_irq(port->dev, mvuart->irq[UART_RX_IRQ],
devm_free_irq(port->dev, mvuart->irq[UART_RX_IRQ], port);
mvuart->irq[UART_RX_IRQ] = irq;