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Original question:

PROCESSOR-SDK-AM62X: GPIO toggle test

PROCESSOR-SDK-AM62X: GPIO

Cyra -
Intellectual 310 points

Part Number: PROCESSOR-SDK-AM62X

Hi,

Related to my past question, how do i export for MCU_GPIO instead of GPIO0_38?

For example: MCU_GPIO0_16

  • 0
    TI__Guru**** 180756 points

    Hi Cyra,

    It is the same process as using MAIN domain GPIO.

    - enable mcu_gpio0 DT node and MCU GPIO pinmux in kernel device tree;

    - once Linux is booted, check '/sys/class/gpio' to see which gpiochipXXX entry corresponds to the MCU_GPIO0 module, then number XXX will be the base index for mcu_gpio0_0 pin, XXX+16 will be the number for MCU_GPIO0_16.

  • 0 in reply to Bin Liu
    Intellectual 310 points

    How do i know the base index?

    I know 401 is for GPIO 0 and 313 is for GPIO 1.

    lrwxrwxrwx  1 root root    0 Nov  7 08:29 gpiochip289 -> ../../devices/platform/bus@f0000/20010000.i2c/i2c-1/1-0022/gpio/gpiochip289
    lrwxrwxrwx  1 root root    0 Nov  7 08:29 gpiochip313 -> ../../devices/platform/bus@f0000/601000.gpio/gpio/gpiochip313
    lrwxrwxrwx  1 root root    0 Nov  7 08:29 gpiochip401 -> ../../devices/platform/bus@f0000/600000.gpio/gpio/gpiochip401
    lrwxrwxrwx  1 root root    0 Nov  7 08:29 gpiochip488 -> ../../devices/platform/bus@f0000/bus@f0000:bus@4000000/4201000.gpio/gpio/gpiochip488

  • +1 in reply to Cyra -
    TI__Guru**** 180756 points

    Hi Cyra,

    In kernel source code arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi line 114, you will see mcu_gpio0 node has name "gpio@4201000". Look for 4201000 in the output above, you will see the last line gpiochip488 points to mcu_gpio0 device 4201000.gpio, so 488 is the first pin of mcu_gpio0 bank, then mcu_gpio0_16 would be 488+16 = 504.

  • 0 in reply to Bin Liu
    Intellectual 310 points

    Thank you so much.