Re: [PATCH RFC 4/6] dt-bindings: rtc: isl1208: Document built-in RTC device on PMIC RAA215300

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Hi Krzysztof,

On Thu, May 4, 2023 at 9:11 AM Krzysztof Kozlowski
<krzysztof.kozlowski@xxxxxxxxxx> wrote:
> On 03/05/2023 10:46, Biju Das wrote:
> > The Built-in RTC device found on PMIC RAA215300 is similar to the isl1208
> > IP. However, RTC is enabled by PMIC RAA215300 and the polarity of the
> > external oscillator is determined by the PMIC revision.
> >
> > Document renesas,raa215300-isl1208 compatible and renesas,raa215300-pmic
> > property to handle these differences.
> >
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > ---
> >  .../devicetree/bindings/rtc/isil,isl1208.yaml       | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/rtc/isil,isl1208.yaml b/Documentation/devicetree/bindings/rtc/isil,isl1208.yaml
> > index 04d51887855f..888a832ed1db 100644
> > --- a/Documentation/devicetree/bindings/rtc/isil,isl1208.yaml
> > +++ b/Documentation/devicetree/bindings/rtc/isil,isl1208.yaml
> > @@ -18,6 +18,7 @@ properties:
> >            - isil,isl1209
> >            - isil,isl1218
> >            - isil,isl1219
> > +          - renesas,raa215300-isl1208
> >
> >    reg:
> >      maxItems: 1
> > @@ -40,6 +41,10 @@ properties:
> >          <0> : Enable internal pull-up
> >          <1> : Disable internal pull-up
> >
> > +  renesas,raa215300-pmic:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: phandle to the pmic device with isl1208 built-in RTC.
>
> No. You don't need cross-linking. We do not represent one device as two
> and then fix this by cross-linking them. The existing binding does not
> have it, so it should be a hint for you.

Makes sense.
So there should be a single device node with 2 reg cells, and
a "renesas,raa215300" compatible value.

On the Linux side, the "renesas,raa215300" MFD driver can instantiate
a PMIC and an RTC cell, the latter served by the (enhanced) existing
rtc-isl1208 driver.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



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