d1s 串口功能配置

[lingeasy]

串口配置，本例程以uart5为参考
1 【sys_config.fex】配置
配置文件参考https://tina.100ask.net/BasicComponent/Linux_Configuration_DevelopmentGuide-01

;路径：\device\config\chips\d1s\configs\nezha\sys_config.fex
;----------------------------------------------------------------------------------
;uart5 configuration
;uart5_used  UART使用控制： 1 使用， 0 不用
;uart5_port  UART端口号
;uart5_type  UART类型，有效值为：2/4/8;表示2/4/8线模式
;uart5_tx    UART TX的GPIO配置
;uart5_rx    UART RX的GPIO配置
;----------------------------------------------------------------------------------
[uart5]
uart5_used = 1
uart5_port = 5
uart5_type = 2
uart5_tx = port:PB4<7><1><default><default>
uart5_rx = port:PB5<7><1><default><default>

2 【linux-5.4\board.dts】配置

// 路径：\device\config\chips\d1s\configs\nezha\linux-5.4\board.dts
uart5_pins_a: uart5_pins@0 {  /* For awol nezha board */
    pins = "PB4", "PB5";
    function = "uart5";
    muxsel = <3>;
    drive-strength = <10>;
    bias-pull-up;
};

uart5_pins_b: uart5_pins@1 {  /* For awol nezha board */
    pins = "PB4", "PB5";
    function = "gpio_in";
};

&uart5 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart5_pins_a>;
	pinctrl-1 = <&uart5_pins_b>;
	status = "okay";
};

[lingeasy]

更正一下，

uart5_pins_a: uart5_pins@0 {  /* For awol nezha board */
    pins = "PB4", "PB5";
    function = "uart5";
    muxsel = <7>;
    drive-strength = <10>;
    bias-pull-up;
};

[aaabbb222]

@lingeasy 你这个配置的目的是干啥用的呀？