imx6ul-14x14-evk.dts中关于串口引脚的定义
pinctrl_uart1: uart1grp {
fsl,pins = <
MX6UL_PAD_UART1_TX_DATA__UART1_DCE_TX 0x1b0b1
MX6UL_PAD_UART1_RX_DATA__UART1_DCE_RX 0x1b0b1
>;
};
0x1b0b1为控制寄存器的值
#########################################################
MX6UL_PAD_UART1_RX_DATA__UART1_DCE_RX的定义在imx6ul-pinfunc.h中,
#define MX6UL_PAD_UART1_RX_DATA__UART1_DCE_RX 0x0088 0x0314 0x0624 0x0 0x3
<mux_reg &nb