re: [PATCH 0/2] rtc: Add Qualcomm PMIC RTC-GLINK support for Glymur

[Troels Vognbjerg]

Kamal Wadhwa <kamal.wadhwa@xxxxxxxxxxxxxxxx> wrote on Fri, 07 Aug 2026 02:26:29 +0530:
> On some targets like Glymur, the permission for receving the RTC
> alarms is routed to charger firmware running on remote subsystem.
> 
> This is because Glymur boards have to  support MSFT's `TAD feature`
> on the windows OS devices.
> 
> So rtc-pm8xxx.c driver cannot recieve RTC alarm IRQs via SPMI on
> Glymur. So in order to make the IRQ available on the Linux kernel,
> the PMIC RTC Alarm IRQ must be routed to APPS via remote subsystem.
> 
> To implement this, add support for a New Qualcomm PMIC GLINK RTC
> client, which will request for RTC set/get calls for time/alarm IRQ
>  via the existing pmic_glink interface to the charger firmware.
> 
> Also, add a DT property to explicily support enabling the RTC
> writes, keep RTC writes disabled by default to align behaviour
> with the existing rtc-pm8xxx.c driver.

You mentioned this patch series applies to targets like Glymur. Does that include
the ASUS Zenbook A16 UX3607OA, or did ASUS do something different on this
laptop?

The reason I am asking is because when I build this as a kernel module,
I get the following error message:
[    2.241461] rtc-pm8xxx c426000.spmi:pmic@0:rtc@6100: probe with driver rtc-pm8xxx failed with error -2
[    2.499556] Modules linked in: rtc_pm8xxx aes_ce_blk ghash_ce gf128mul sm4_ce_gcm sm4_ce_ccm sm4_ce sm4_ce_cipher sm4 qcom_battmgr rtc_qcom_glink(+) simple_bridge display_connector
[    3.277788] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[    4.318666] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[    4.319085] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: registered as rtc0
[    5.359404] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[    6.400331] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[    6.400496] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: hctosys: unable to read the hardware clock
[   25.447761] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[   26.488271] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[   27.517573] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[   28.560114] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[   29.609224] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[   30.638629] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[   31.677524] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[   32.720749] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[   33.757662] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back
[   34.808360] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: all time sources failed
[   35.837651] rtc_qcom_glink.qcom_pmic_rtc_glink pmic_glink.rtc-glink.0: 0x68 failed (-110), falling back

And the error message keeps repeating every second or so.

--
Troels Vognbjerg