AR933X_UART_INT_RX_VALID
up->ier |= AR933X_UART_INT_RX_VALID;
up->ier &= ~AR933X_UART_INT_RX_VALID;
ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_RX_VALID);
if (status & AR933X_UART_INT_RX_VALID) {
AR933X_UART_INT_RX_VALID);