TPS65910A3EVM-583: hwclock command gives error when trying to use RTC on TPS65910A3 with am335x-GP-evm.

siva nallamalli

Part Number: TPS65910A3EVM-583
Other Parts Discussed in Thread: TPS65910

I am using am335x-GP-evm and trying to enable and use RTC available on PMIC. I am refering below thread and did changes to dts for tps & kernel config CONFIG_RTC_TPS65910=y.

https://e2e.ti.com/support/processors/f/processors-forum/659761/linux-am3352-device-tree-settings-for-tps65910-rtc

hwclock command gives error when using rtc on pmic.

#hwclock
hwclock: select() to /dev/rtc0 to wait for clock tick timed out.

#hwclock -f /dev/rtc0

hwclock: select() to /dev/rtc0 to wait for clock tick timed out.

hwclock command gives wrong date & not storing time between power cycles.

#hwclock -f /dev/rtc1
2000-01-01 01:14:44.133543+00:00

please Let me know chnages needed for am335x-GP-EVM

over 4 years ago

0 Nick Saulnier over 4 years ago

TI__Guru** 100830 points

Hello Siva,

Please attach your changes to dts files. What terminal output do you see at bootup? e.g., "dmesg | grep rtc"?

Regards,

Nick

0 siva nallamalli over 4 years ago in reply to Nick Saulnier

Intellectual 860 points

These are my changes added to existing node tps to am335x-evm.dts.

reg = <0x2d>;
interrupt-parent = <&intc>;
interrupts = < 0 118 0x04 >;

#gpio-cells = <2>;
gpio-controller;

#interrupt-cells = <2>;
interrupt-controller;

ti,en-ck32k-xtal;

vcc1-supply = <&vbat>;
vcc2-supply = <&vbat>;
vcc3-supply = <&vbat>;
vcc4-supply = <&vbat>;
vcc5-supply = <&vbat>;
vcc6-supply = <&vbat>;
vcc7-supply = <&vbat>;
vccio-supply = <&vbat>;

0 Nick Saulnier over 4 years ago in reply to siva nallamalli

TI__Guru** 100830 points

Hello Siva,

Please attach any terminal output do you see at bootup. For example, you could search for lines with rtc in them with command "dmesg | grep rtc"

Power management

Power management forum

TPS65910A3EVM-583: hwclock command gives error when trying to use RTC on TPS65910A3 with am335x-GP-evm.