msm8937之串口dts配置

最新推荐文章于 2019-08-21 10:27:32 发布

原创最新推荐文章于 2019-08-21 10:27:32 发布 · 894 阅读

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本文详细介绍了如何在MSM8937平台上配置UART接口，包括使能设置、功能配置以及GPIO配置。具体涉及uart1、uart2、uart5和uart6的详细配置参数，如中断、时钟、GPIO驱动强度和偏置设置。

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修改1:
msm8937-mtp.dtsi 使能配置

&blsp1_uart1 {//uart1
   status = "ok";
   pinctrl-names = "default";
   pinctrl-0 = <&uart1_console_active>;
};

&blsp1_uart2 {//uart2
   status = "ok";
   pinctrl-names = "default";
   pinctrl-0 = <&uart_console_active>;
};

&blsp2_uart5 {//uart5
   status = "ok";
   pinctrl-names = "default";
   pinctrl-0 = <&uart5_console_active>;
};

&blsp2_uart6 {//uart6
   status = "ok";
   pinctrl-names = "default";
   pinctrl-0 = <&uart6_console_active>;
};
修改2:
msm8937.dtsi 功能配置

   blsp1_uart1: serial@78af000 {//uart1
       compatible = "qcom,msm-lsuart-v14";
       reg = <0x78af000 0x200>;
       interrupts = <0 107 0>;
       status = "disabled";
       clocks = <&clock_gcc clk_gcc_blsp1_uart1_apps_clk>,
       <&clock_gcc clk_gcc_blsp1_ahb_clk>;
       clock-names = "core_clk", "iface_clk";
   };

   blsp1_uart2:serial@78b0000 {//uart2
       compatible = "qcom,msm-lsuart-v14";
       reg = <0x78b0000 0x200>;
       interrupts = <0 108 0>;
       status = "disabled";
       clocks = <&clock_gcc clk_gcc_blsp1_uart2_apps_clk>,
       <&clock_gcc clk_gcc_blsp1_ahb_clk>;
       clock-names = "core_clk", "iface_clk";
   };

   blsp2_uart5:serial@7aef000 {//uart5
       compatible = "qcom,msm-lsuart-v14";
       reg = <0x7aef000 0x200>;
       interrupts = <0 306 0>;
       status = "disabled";
       clocks = <&clock_gcc clk_gcc_blsp2_uart1_apps_clk>,
           <&clock_gcc clk_gcc_blsp2_ahb_clk>;
       clock-names = "core_clk","iface_clk";
   };

   blsp2_uart6:serial@7af0000 {//uart6
       compatible = "qcom,msm-lsuart-v14";
       reg = <0x7af0000 0x200>;
       interrupts = <0 307 0>;
       status = "disabled";
       clocks = <&clock_gcc clk_gcc_blsp2_uart2_apps_clk>,
           <&clock_gcc clk_gcc_blsp2_ahb_clk>;
       clock-names = "core_clk","iface_clk";
   };

修改3:
msm8937-pinctrl.dtsi GPIO配置
       pmx-uart1console {//uart1
           uart1_console_active: uart1_console_active {
               mux {
                   pins = "gpio0","gpio1";
                   function = "blsp_uart1";
               };
               config {
                   pins = "gpio0","gpio1";
                   drive-strength = <2>;
                   bias-disable;
               };
           };
           uart1_console_sleep: uart1_console_sleep {
               mux {
                   pins = "gpio0","gpio1";
                   function = "blsp_uart1";
               };
               config {
                   pins = "gpio0","gpio1";
                   drive-strength = <2>;
                   bias-pull-down;
               };
           };
       };

       pmx-uartconsole {//uart2
           uart_console_active: uart_console_active {
               mux {
                   pins = "gpio4", "gpio5";
                   function = "blsp_uart2";
               };

               config {
                   pins = "gpio4", "gpio5";
                   drive-strength = <2>;
                   bias-disable;
               };
           };

           uart_console_sleep: uart_console_sleep {
               mux {
                   pins = "gpio4", "gpio5";
                   function = "blsp_uart2";
               };

               config {
                   pins = "gpio4", "gpio5";
                   drive-strength = <2>;
                   bias-pull-down;
               };
           };

};

       pmx-uart5console {//uart5
           uart5_console_active: uart_console_active {
               mux {
                   pins = "gpio16","gpio17";
                   function = "blsp_uart5";
               };

               config {
                   pins = "gpio16","gpio17";
                   drive-strength = <2>;
                   bias-disable;
               };
           };
           uart5_console_sleep: uart5_console_sleep {
               mux {
                   pins = "gpio16","gpio17";
                   function = "blsp_uart5";
               };

               config {
                  pins = "gpio16","gpio17";
                   drive-strength = <2>;
                   bias-disable;
               };
           };

};

       pmx-uart6console {//uart6
           uart6_console_active: uart_console_active {
               mux {
                   pins = "gpio20","gpio21";
                   function = "blsp_uart6";
               };

               config {
                   pins = "gpio20","gpio21";
                   drive-strength = <2>;
                   bias-disable;
               };
           };
           uart6_console_sleep: uart6_console_sleep {
               mux {
                   pins = "gpio20","gpio21";
                   function = "blsp_uart6";
               };

               config {
                   pins = "gpio20","gpio21";
                   drive-strength = <2>;
                   bias-disable;
               };
           };
       };