nrf53 device tree uart

[Corentin]

Hello,

For my board i would like to remap uart to pin on GPIO PORT 1.

Current:

&uart0 {
    status = "okay";
    current-speed = <115200>;
    tx-pin = <20>;
    rx-pin = <22>;
    rts-pin = <19>;
    cts-pin = <21>;
};

Requirement:

&uart1 {
    status = "okay";
    current-speed = <115200>;
    tx-pin = <&gpio1 10 0>;
    rx-pin = <29>;
    rts-pin = <0>;    /* not used */
    cts-pin = <0>;    /* not used */
};

My problem is that I don't know the format for specifying a gpio on port 1. By default, when i set <10> it's for GPIO 0. But i need GPIO 1.

Can you guide me ?

[Corentin]

Do not configure rts and cts as suggested (set unused pins to 0xFFFFFFFF, not 0.). If not used just delete rts-pin and cts-pin. If you keep for instance rts-pin=0x0xFFFFFFFF you have a hard fault when PM_DEVICE is enabled because drivers don't find gpio to this address. Delete rts-pin if not used form device trees solved the problem.

[Øivind]

Hi again,

That's a bug I was unaware of, thanks for letting me know! Can you give me some more details, so I can reproduce it and report it internally?

Setting an unused pin to 0xFFFFFFFF is proper and should not cause such issues.