IMX93 PCF8563 debug

[5454ty]

HI:

   I was debugging the pcf8563,

   [ 2.215985] rtc-pcf8563 2-0051: registered as rtc0
[ 2.221124] rtc-pcf8563 2-0051: hctosys: unable to read the hardware clock

 It has the error

The log is as follows:

[Chavira]

Hi @5454ty!

Since you use external RTC chip, It means there are 2 RTCs in you system, another is RTC in CPU.

Maybe that should be the error message but the RTC should work fine.

Best Regards!

Chavira

[5454ty]

root@imx93evk:~# hwclock -r
hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Invalid argument
root@imx93evk:~# sudo hwclock -r
hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Invalid argument
root@imx93evk:~#

It reported the error above 

[Chavira]

Hi @5454ty!

How you are setting the device tree in the board?

The iMX93-EVK has 2 RTC, the internal that is rtc0 and the external pcf2131 that is rtc1.

I am trying with those RTC without errors.

https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/arch/arm64/boot/dts/freescale/imx93.dtsi#L417

https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts...

Best Regards!

Chavira

[5454ty]

HI,

   My dts is as follows:

[Chavira]

Hi @5454ty!

I recommend to use the next configuration:

pcf8563: pcf8563@51 {
      compatible = "nxp,pcf8563";
      reg = <0x51>;
     #clock-cells = <0>;

      status = "okay";
};

Best Regards!

Chavira

[5454ty]

HI, 

   I used the above configuration

 But ,it still reported error when the system is bootup

rtc-pcf8563 2-0051: registered as rtc0

rtc-pcf8563 2-0051: hctosys: unable to read the hardware clock

[daihao]

Hello, have you solved this problem in the end? What caused it? I also encountered the same problem.