+#define MPU401_INFO_INPUT (1 << 0) /* input stream */
+#define MPU401_INFO_OUTPUT (1 << 1) /* output stream */
+#define MPU401_INFO_INTEGRATED (1 << 2) /* integrated h/w port */
+#define MPU401_INFO_MMIO (1 << 3) /* MMIO access */
+#define MPU401_INFO_TX_IRQ (1 << 4) /* independent TX irq */
+