[PATCH v3 10/19] dt-bindings: clock: rockchip: Document RV1126 CRU

[Heiko Stübner]

Am Freitag, 19. August 2022, 23:20:03 CEST schrieb Jagan Teki:
> On Fri, 19 Aug 2022 at 02:59, Stephen Boyd <sboyd at kernel.org> wrote:
> >
> > Quoting Jagan Teki (2022-08-18 05:41:23)
> > > +
> > > +  clocks:
> > > +    maxItems: 1
> > > +
> > > +  clock-names:
> > > +    const: xin24m
> > > +
> > > +  rockchip,grf:
> > > +    $ref: /schemas/types.yaml#/definitions/phandle
> > > +    description:
> > > +      Phandle to the syscon managing the "general register files" (GRF),
> > > +      if missing pll rates are not changeable, due to the missing pll
> > > +      lock status.
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - "#clock-cells"
> > > +  - "#reset-cells"
> >
> > Why aren't clocks required?
> 
> I don't see any clocks being used by cru in rv1126 [1] so that is the
> reason I didn't add any. Let me know if it is something that is
> mandatory to add even if it's unused.
> [1] https://github.com/rockchip-linux/kernel/blob/develop-4.19/arch/arm/boot/dts/rv1126.dtsi#L1074

Our clock drivers normally just expect that xin24m to be present
but that xin24m _is_ a clock dependency for the cru and for a lot
of Rockchip SoCs Johan did update both the binding and the dtsi-s
to make that explicit when converting the binding over to yaml

See for example the rk3399.

Heiko