[参考译文] AM625：AM62x SKEVM UART

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1417675/am625-am62x-skevm-uart

器件型号：AM625

工具与软件：

您好！

我们正在开发电路板：AM62x SKEVM 和 SDK 版本：10.00.07.04、以便在 User Expension 或 MCU 标头中添加4个 UART。我们已成功在下面添加了带有 dtso 代码的三个 UART EXP_UART5、EXP_UART1和 EXP_UART6。

k3-am62x-sk-uarts.dtso：

#include "k3-pinctrl.h"

&main_pmx0 {
        user_exp_uart1_pins_default: user-exp_uart1_pins_default {
                pinctrl-single,pins = <
                        AM62X_IOPAD(0x01b0, PIN_OUTPUT, 2) /* (A20) EXP_UART1_TXD  */
                        AM62X_IOPAD(0x01ac, PIN_INPUT, 2) /* (E19) EXP_UART1_RXD  */
                >;
        };

        user_exp_uart5_pins_default: user-exp_uart5_pins_default {
                pinctrl-single,pins = <
                        AM62X_IOPAD(0x01dc, PIN_OUTPUT, 1) /* (E15) EXP_UART5_TXD  */
                        AM62X_IOPAD(0x01d8, PIN_INPUT, 1) /* (C15) EXP_UART5_RXD  */
                >;
        };

        user_exp_uart6_pins_default: user-exp_uart6_pins_default {
                pinctrl-single,pins = <
                        AM62X_IOPAD(0x00a0, PIN_OUTPUT, 3) /* (K25) EXP_UART6_TXD  */
                        AM62X_IOPAD(0x009c, PIN_INPUT, 3) /* (V25) EXP_UART6_RXD  */
                >;
        };

        user_exp_uart2_pins_default: user-exp_uart2_pins_default {
                pinctrl-single,pins = <
                        AM62X_IOPAD(0x01a0, PIN_OUTPUT, 5) /* (E18) PR0_UART0_TXD  */
                        AM62X_IOPAD(0x019c, PIN_INPUT, 5) /* (B18) PR0_UART0_RXD  */
                >;
        };
};

&mcu_pmx0{
        mcu_uart0_pins_default: mcu-uart0-pins-default {
                pinctrl-single,pins = <
                        /* AM62X_MCU_IOPAD(0x001c, PIN_INPUT, 0) /* MCU_UART0_CTSn */
                        /* AM62X_MCU_IOPAD(0x0020, PIN_OUTPUT, 0) /* MCU_UART0_RTSn */
                        AM62X_MCU_IOPAD(0x0018, PIN_OUTPUT, 0) /* MCU_UART0_TXD */
                        AM62X_MCU_IOPAD(0x0014, PIN_INPUT, 0) /* MCU_UART0_RXD */
                >;
        };
};

&main_uart1 {
        pinctrl-names = "default";
        pinctrl-0 = <&user_exp_uart1_pins_default>;
        status = "okay";
};

&main_uart5 {
        pinctrl-names = "default";
        pinctrl-0 = <&user_exp_uart5_pins_default>;
        status = "okay";
};

&main_uart6 {
        pinctrl-names = "default";
        pinctrl-0 = <&user_exp_uart6_pins_default>;
        status = "okay";
};

&main_uart2 {
        pinctrl-names = "default";
        pinctrl-0 = <&user_exp_uart2_pins_default>;
        status = "okay";
};

&mcu_uart0 {
        pinctrl-names = "default", "wakeup";
        pinctrl-0 = <&mcu_uart0_pins_default>;
        status = "okay";
};

k3-am62x-sk-common.dtsi：

#include <dt-bindings/leds/common.h>
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/net/ti-dp83867.h>
#include "k3-am625.dtsi"

/ {
        aliases {
                serial1 = &main_uart1;
                serial2 = &main_uart0;
                serial5 = &main_uart5;
                serial6 = &main_uart6;
                serial0 = &main_uart2;
                serial7 = &mcu_uart0;
                mmc0 = &sdhci0;
                mmc1 = &sdhci1;
                mmc2 = &sdhci2;
                spi0 = &ospi0;
                ethernet0 = &cpsw_port1;
                ethernet1 = &cpsw_port2;
                usb0 = &usb0;
                usb1 = &usb1;
        };

不过、MCU_UART0和 PR0_UART0未正常工作、尽管在 shell 中说明了此问题、如下所示。