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SK-AM62: How to enable UserExpension Uart

Swapnil T
Prodigy 30 points
Part Number: SK-AM62

Tool/software:

Hi TI.

SDK: ti-processor-sdk-linux-am62xx-evm-09.02.01.09

I am using SK-AM62 Starter kit Which having 40 pin User Expansion Connector.
I want to enable UART5 (EXP_UART5_TXD, EXP_UART5_RXD) which is the part of User Expansion Connector.

Can you please guide me how to enable uart.

Thanks.

  • 0
    Prodigy 30 points

    Hi TI,

    I have added k3-am62x-sk-uart5.dtso file with following content

    /dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>
#include "k3-pinctrl.h"

&main_pmx0 {
	user_exp_uart5_pins_default: user-exp-uart5-pins-default {
		pinctrl-single,pins = <
			AM62X_IOPAD(0x01dc, PIN_OUTPUT, 0) /* (E15) EXP_UART5_TXD  */
			AM62X_IOPAD(0x01d8, PIN_INPUT, 0) /* (C15) EXP_UART5_RXD  */
		>;
	};
};

&main_i2c1 {
        gpio@22 {
                p05-hog {
                        /* P05 - EXP_PS_3V3_EN */
                        gpio-hog;
                        gpios = <5 GPIO_ACTIVE_HIGH>;
                        output-high;
                        line-name = "EXP_PS_3V3_EN";
                };

		        p23-hog {
			            /* P23 - IO_EXP_TEST_LED */
			            gpio-hog;
			            gpios = <23 GPIO_ACTIVE_HIGH>;
			            output-high;
			            line-name = "IO_EXP_TEST_LED";
		        };
        };
};

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

    and added k3-am62x-sk-uart5.dtbo in uEnv.txt. 
    Still uart5 is not up, can you please help me what missing here.

    Thanks.

  • 0 in reply to Swapnil T
    TI__Guru**** 168211 points

    Hi Swapnil,

    Your kernel device tree seems missing 2 things for enabling UART5.

    - pinmux: you should use pin E15/C15 mode 1, not mode 0;

    - you need to add main_uart5 to the aliases section in the kernel device tree.

  • +1 in reply to Bin Liu
    Prodigy 30 points

    Hi Bin Liu,

    Thanks, now its working fine.