U-Boot on ROCK Pi N10 does not see GPIO

#1

Thanks to Stephen’s advise , I’ve managed to get access to U-Boot command line.
I have enabled the gpio command (CONFIG_CMD_GPIO=y) in the U-Boot configuration.
I have enabled the used gpios in the /arch/arm/dts/rk3399pro-rockpi-n10-linux.dts

&gpio0 {
        status = "okay";
};
&gpio1 {
        status = "okay";
};
&gpio2 {
        status = "okay";
};

However, I still can’t access GPIOs from U-Boot.
gpio status -a returns empty line.

TIA & Regards,
Wojtek

#2

I had to add in the arch/arm/dts/rk3399-u-boot.dtsi the following definitions:

&pinctrl {
       status = "okay";
       u-boot,dm-pre-reloc;
};

&gpio0 {
       status = "okay";
       u-boot,dm-pre-reloc;
};

&gpio1 {
       status = "okay";
       u-boot,dm-pre-reloc;
};

&gpio2 {
       status = "okay";
       u-boot,dm-pre-reloc;
};

After the above, the gpio status -a started to report the GPIOs.

Looking for the right solution I have also set CONFIG_SPL_GPIO_SUPPORT=y in the U-Boot configuration. I have not verified yet if that is really needed.