Enabling rtc PCF855063 rtc on CM3 Kernel via BSP

#1

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:

       /dts-v1/;

 / {
   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 !