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DRA821U: USB irq pin

Ashwini A
Prodigy 160 points

Part Number: DRA821U

Dear Team,

we are woking on DRA821U2 custom board . 

we have connected (D5)WKUP_GPIO0_31 pin as irq pin to FUSB302MPX typeC controller, we observed that sometimes the irq is not clearing, beacuse of this typeC is not functioning properly, is there any option to clear the irq or give pullup internally

Regards,

Ashwini A

  • 0
    TI__Guru 70065 points

    Hi Ashwini

    Assigned expert is on leave and will be back by 28-May-2026 .Allow us sometime tt respond on this.

    Regards
    Diwakar

  • 0
    TI__Mastermind 19040 points

    HI Ashwini,

    I will loop in the hardware expert to have a look into this query.

    In the meantime, can you share the USB hardware schematics for the custom board.

    Best Regards

    Gokul Praveen

  • 0 in reply to Gokul Praveen
    TI__Guru 64160 points

    Hi Ashwini,

    Yes, this pin has the capability of having internal pullup or pulldown when it is setup during the pin mux.

  • 0 in reply to ShreyasRao
    Prodigy 160 points

    Hii ShreyasRao,

    Thank you for your reply.

    Please find below the schematic related to the USB Type-C interface.


    The IRQ pin is configured in the pinmux as shown below:


            wkup_typec_irq_pins_default: wkup_typec_irq_pins {
                    pinctrl-single,pins = <
                            J721E_WKUP_IOPAD(0x4, PIN_INPUT, 7) /* (D5) MAIN_OSPI0_CSn3.WKUP_GPIO0_31*/
                    >;
            };

    However, we are observing that the IRQ is not getting cleared.

    Could you please let us know if there are any additional configurations that need to be checked

    Regards,

    Ashwini A

  • 0 in reply to Ashwini A
    TI__Guru 64160 points

    Are the FUSB302 device from TI? I am not sure to how the other device might behave. 

    All the interrupts in the ISR may need to serviced before the IRQ is cleared. 

    Another suggestion is to have the IRQ as level triggered instead of edge-triggered. 

  • 0 in reply to ShreyasRao
    Prodigy 160 points

    Dear ShreyasRao,

    Thank you for your response.

    ShreyasRao said:
    Another suggestion is to have the IRQ as level triggered instead of edge-triggered. 

    whether drivers/gpio/gpio-davinci.c this driver support level triggered.(Linux 6.12.57).

    Regards,

    Ashwini

  • 0 in reply to Ashwini A
    TI__Guru 64160 points
    Ashwini A said:

    whether drivers/gpio/gpio-davinci.c this driver support level triggered.(Linux 6.12.57).

    Yes, it accepts level low and level high irq. 

    but more importantly need to ensure that the interrupt / inta / intb registers are all cleared in the ISR and the int_n actually go low b/w the interrupts.