Changing vdd-rtc for custom carrier board

[vK-embedded]

Hey,

I’m using Jetpack 4.5.1 TX2 and would like to change the rtc voltage for a custom carrier board to 3.3V.

I see that the max77260.c has a function for backup battery and have made the following change in the device tree.

  backup-battery {
                                backup-battery-charging-current = <0x190>;
                                backup-battery-charging-voltage = <0x325aa0>;
                                backup-battery-output-resister = <0x64>;
                                status = "okay";
                        };

And here is the vdd-rtc node ldo4.

ldo4 {
                                        regulator-name = "vdd-rtc";
                                        regulator-always-on;
                                        regulator-boot-on;
                                        maxim,active-fps-source = <0x0>;
                                        maxim,active-fps-power-up-slot = <0x1>;
                                        maxim,active-fps-power-down-slot = <0x7>;
                                        regulator-enable-ramp-delay = <0x1a>;
                                        regulator-disable-ramp-delay = <0x672>;
                                        maxim,ramp-rate-setting = <0x186a0>;
                                        regulator-ramp-delay = <0x80e8>;
                                        linux,phandle = <0x17a>;
                                        phandle = <0x17a>;
                                };

If i try adding the following to ldo4 ie vdd-rtc then the jetpack does not reboot, thus crashes.

regulator-min-microvolt = <0x325aa0>;
regulator-max-microvolt = <0x325aa0>;

Also, when i run,

dmesg | grep rtc

i get the following as a response :

[ 0.565475] vdd-rtc: at 800 mV

Would like some insight on the same, Thanks

[vK-embedded]

Apologies, we have found out that there was error in the hardware.

You may delete this post if required but this is a working summation for the same.

Thanks,