Hi, Here is a driver for the RTC found inside of the Motorola Droid 4 based on linux-next 2017021. I tried to set & get the time using hwclock and used ./tools/testing/selftests/timers/rtctest.c:
$ ./rtctest RTC Driver Test Example. Counting 5 update (1/sec) interrupts from reading /dev/rtc0: 1 2 3 4 5 Again, from using select(2) on /dev/rtc: 1 2 3 4 5 Current RTC date/time is 20-2-2017, 07:11:22. Alarm time now set to 07:11:27. Waiting 5 seconds for alarm... okay. Alarm rang. Periodic IRQ rate is 1Hz. Counting 20 interrupts at: 2Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 4Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 8Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 16Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 32Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 64Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 *** Test complete *** I did not include a patch for omap4-droid4-xt894.dts, since the CPCAP DT entry has not yet been added. The following DT snippet can be used for testing on droid4: &cpcap { cpcap_rtc: rtc { compatible = "motorola,cpcap-rtc"; interrupt-parent = <&cpcap>; interrupts = <39 IRQ_TYPE_NONE>, <26 IRQ_TYPE_NONE>; }; }; -- Sebastian Sebastian Reichel (1): rtc: cpcap: new rtc driver .../devicetree/bindings/rtc/cpcap-rtc.txt | 13 + drivers/rtc/Kconfig | 7 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-cpcap.c | 318 +++++++++++++++++++++ 4 files changed, 339 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/cpcap-rtc.txt create mode 100644 drivers/rtc/rtc-cpcap.c -- 2.11.0 -- You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. --- You received this message because you are subscribed to the Google Groups "rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to rtc-linux+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.