Setup for current Armbian/Ubuntu (25.8.2) for PCF8563 RTC on C2

[Scott Ksander]

Anybody got PCF8563 configured and running on current armbian (25.8.2 noble aarch64) on a C2?

 

i2cdetect -y 0 is seeing the device ID (0x51)  and I have added module rtc-pcf8563 but no joy.  HWCLOCK does not see the device.

 

Any help would be appreciated.

 

Scott

[Scott Ksander]

I tried rebuilding the Device Tree as suggested in other forums.  No Joy!!  Still can't get it to work.  Also added i2c-dev module but that isn't showing in lsmod.

 

Help appreciated.  Clearly I am missing something here.   This shouldn't be difficult.  :-)

[Scott Ksander]

Turns out the secret was getting the address and symbols right in the device tree.   I create the following as meson-pcf8563.dts, compiled into meson-pcf8563.dtbo, moved to /boot/dtb/amlogic/overlay, and added pcf8563 to the "overlays" line in armbianEnv.txt.

 

/dts-v1/;

 

/ {

            compatible = "amlogic,meson-gxbb";

 

            fragment@0 {

                  target-path = "/aliases";

 

                  __overlay__ {

                        i2cA = "/soc/bus@c1100000/i2c@8500";

                  };

            };

 

            fragment@1 {

                  target-path = "/soc/bus@c1100000/i2c@8500";

 

                  __overlay__ {

                        #address-cells = <1>;

                        #size-cells = <0>;

                        pcf8563: rtc@51 {

                              compatible = "nxp,pcf8563";

                              reg = <0x51>;

                              status = "okay";

                        };

                  };

            };

};