Add pinctrl to allow the use of output pin for interrupt signal 1
for wakealarm. This is needed for wakealarms to work on Synology NAS
devices.

I could only partially test the pinctrl patch. My testing system runs
ACPI, which makes it impossible for me to configure pinctrl there. I did
however verify that with missing pinctrl configuration in the devicetree,
the register were correctly set. So there should be no regressions.
Every other mode than ignore, disable and wakeup should also be
considered untested.

Also If I am not mistaken, wake alarms on these systems are currently broken:
(not tested, judged by looking at the devicetrees).

- arch/arm/boot/dts/marvell/armada-370-synology-ds213j.dts
- arch/arm/boot/dts/marvell/armada-xp-synology-ds414.dts
- arch/arm/boot/dts/marvell/kirkwood-synology.dtsi
- arch/arm/boot/dts/marvell/kirkwood-ds110jv10.dts
- arch/arm/boot/dts/marvell/kirkwood-ds111.dts
- arch/arm/boot/dts/marvell/kirkwood-ds112.dts
- arch/arm/boot/dts/marvell/kirkwood-ds210.dts
- arch/arm/boot/dts/marvell/kirkwood-ds212.dts
- arch/arm/boot/dts/marvell/kirkwood-ds212j.dts
- arch/arm/boot/dts/marvell/kirkwood-ds411.dts
- arch/arm/boot/dts/marvell/kirkwood-ds411j.dts
- arch/arm/boot/dts/marvell/kirkwood-ds411slim.dts
- arch/arm/boot/dts/marvell/kirkwood-rs212.dts
- arch/arm/boot/dts/marvell/kirkwood-rs411.dts

If thats the case it can be fixed by using this patch series and adding
the example in the devicetree to the s35390a devicetree.

If somebody still runs one of these systems, please test.

Thanks
- Markus Probst

Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
Changes in v2:
- remove sii,wakealarm-output-pin property
- add pinctrl
- add fix to allow disabling of wake alarms
- add synology quirk
- Link to v1: https://patch.msgid.link/20260630-rtc_s35390a_int1-v1-0-1b2239e16be2@posteo.de

---
Markus Probst (5):
      dt-bindings: rtc: Add pinctrl for S35390A
      rtc: s35390a: Add missing newline to dev_err
      rtc: s35390a: Fix alarm not disabling
      rtc: s35390a: Add pinctrl
      rtc: s35390a: Add synology quirk

 .../devicetree/bindings/rtc/sii,s35390a.yaml       | 119 ++++++
 .../devicetree/bindings/rtc/trivial-rtc.yaml       |   3 -
 MAINTAINERS                                        |   1 +
 drivers/rtc/Kconfig                                |   3 +
 drivers/rtc/rtc-s35390a.c                          | 429 ++++++++++++++++++---
 include/dt-bindings/rtc/s35390a.h                  |  23 ++
 6 files changed, 519 insertions(+), 59 deletions(-)
---
base-commit: a8e429896436e8c2d288181f875f92af8204bc58
change-id: 20260630-rtc_s35390a_int1-556ccb308d3f