[PATCH 1/3] dt-bindings: rtc: Add sii,wakealarm-output-pin property for S35390A

[Markus Probst]

On Wed, 2026-07-01 at 17:06 +0200, Alexandre Belloni wrote:
> On 30/06/2026 19:22:21+0000, Markus Probst wrote:
> > Synology NAS devices use the output pin for interrupt signal 1 to wake up
> > the system.
> > 
> > Move devicetree bindings for sii,s35390a into its own file.
> > Add sii,wakealarm-output-pin property to enable the use of the output
> > pin for interrupt signal 1 for the wake alarm, which makes it possible to
> > set an wake alarm on Synology NAS devices.
> > 
> > Signed-off-by: Markus Probst <markus.probst at posteo.de>
> > ---
> >  .../devicetree/bindings/rtc/sii,s35390a.yaml       | 54 ++++++++++++++++++++++
> >  .../devicetree/bindings/rtc/trivial-rtc.yaml       |  3 --
> >  MAINTAINERS                                        |  1 +
> >  include/dt-bindings/rtc/s35390a.h                  |  9 ++++
> >  4 files changed, 64 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/rtc/sii,s35390a.yaml b/Documentation/devicetree/bindings/rtc/sii,s35390a.yaml
> > new file mode 100644
> > index 000000000000..31a578673870
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/rtc/sii,s35390a.yaml
> > @@ -0,0 +1,54 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/rtc/sii,s35390a.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: S-35390A 2-WIRE REAL-TIME CLOCK
> > +
> > +maintainers:
> > +  - Alexandre Belloni <alexandre.belloni at bootlin.com>
> > +
> > +description:
> > +  The S-35390A is a CMOS 2-wire real-time clock IC which operates with the
> > +  very low current consumption in the wide range of operation voltage.
> > +
> > +allOf:
> > +  - $ref: rtc.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: sii,s35390a
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  sii,wakealarm-output-pin:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    enum: [1, 2]
> > +    description: |
> > +      The output pin to wake up the system.
> > +      Default will use the output pin for interrupt signal 2.
> > +        <S35390A_OUTPUT_PIN_INT1> : Output pin for interrupt signal 1
> > +        <S35390A_OUTPUT_PIN_INT2> : Output pin for interrupt signal 2
> > +
> 
> Ideally, we'd get a proper pinctrl driver part for this because what
> happens if you want interrupts on both pin or clock output on both pins
> or any combination of interrupts and clocks?
> 
Yes.

Thanks
- Markus Probst



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