RK_PB2
{ 4, RK_PB2, 1, ROUTE_GRF, 0x0304, ROUTE_VAL(2, 0) }, /* I2C4 M0 */
{ 3, RK_PB2, 5, ROUTE_GRF, 0x0308, ROUTE_VAL(0, 0) }, /* PWM9 M0 */
{ 3, RK_PB2, 4, ROUTE_GRF, 0x030c, ROUTE_VAL(14, 1) }, /* UART4 M1 */