Enabling rtc PCF855063 rtc on CM3 Kernel via BSP

Hello everyone,

Can you please tell me if i’m on the right path :

I am trying to enable the pcf85063 rtc by building a new kernel via the new bsp tool

So far what I understood is:

  1. Use the bsp tool to compile a new kernel with:

    • flag CONFIG_RTC_DRV_PCF85063=y enabled in rockchip_linux_defconfig

    • new dtbo for this rtc that looks like this:

       / {
         compatible = "rockchip,rk3568";
         fragment@0 {
                 target = <0xffffffff>;
                 __overlay__ {
                         status = "okay";
                         #address-cells = <0x01>;
                         #size-cells = <0x00>;
                         pcf85063@51 {
                                 compatible = "nxp,pcf85063";
                                 reg = <0x51>;
                                 phandle = <0x01>;
         __symbols__ {
                 pcf85063 = "/fragment@0/__overlay__/pcf85063@51";
         __fixups__ {
                 i2c0 = "/fragment@0:target:0";
    • Build kernel with ./bsp linux rk356x

  2. Rebuild debian image with new kernel (i’m using debos-radxa)

    • Replace linux-4.19-rock-3-latest kernel with the on I just generated
    • Add dtbo overlay to /boot/extlinux/extlinux.conf

Am i on the right path ? thanks !