General serial port configuration

General serial port configuration

Let’s take UART1 as an example，To describe the configuration in the kernel when a normal serial port is turned on。Change Status in DTS to OK：

# vi arch/arm/boot/dts/infinity2m.dtsi

        uart1: uart1@1F221200 {
            compatible = "sstar,uart";
            reg = <0x1F221200 0x100>;
            interrupts = <GIC_SPI INT_IRQ_UART_1 IRQ_TYPE_LEVEL_HIGH>;
            clocks = <&CLK_uart1>;
            status = "ok";
        };

Configure the corresponding pin as UART_MODE_1：

# vi arch/arm/boot/dts/infinity2m-ssc011a-s01a-padmux-display.dtsi

    <PAD_UART1_RX         PINMUX_FOR_UART1_MODE_1       MDRV_PUSE_UART1_RX >,
    <PAD_UART1_TX         PINMUX_FOR_UART1_MODE_1       MDRV_PUSE_UART1_TX >,

Load the SStarSerial/UART driver:

# cd linux-4.9.84 && ARCH=arm make menuconfig