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SubjectRe: [PATCH 1/2] dt-bindings: power: syscon-reboot: Convert bindings to json-schema
On Tue, 3 Sep 2019 at 09:14, Rob Herring <robh+dt@kernel.org> wrote:
>
> On Mon, Sep 2, 2019 at 4:03 PM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> >
> > Convert the Syscon reboot bindings to DT schema format using
> > json-schema.
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > ---
> > .../bindings/power/reset/syscon-reboot.txt | 30 --------
> > .../bindings/power/reset/syscon-reboot.yaml | 68 +++++++++++++++++++
> > 2 files changed, 68 insertions(+), 30 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> > create mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml
>
> > diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml b/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml
> > new file mode 100644
> > index 000000000000..a583f3dc8ef4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml
> > @@ -0,0 +1,68 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/power/reset/syscon-reboot.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Generic SYSCON mapped register reset driver
> > +
> > +maintainers:
> > + - Sebastian Reichel <sre@kernel.org>
> > +
> > +description: |+
> > + This is a generic reset driver using syscon to map the reset register.
> > + The reset is generally performed with a write to the reset register
> > + defined by the register map pointed by syscon reference plus the offset
> > + with the value and mask defined in the reboot node.
> > + Default will be little endian mode, 32 bit access only.
> > +
> > +properties:
> > + compatible:
> > + const: syscon-reboot
> > +
> > + mask:
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + description: Update only the register bits defined by the mask (32 bit).
> > + maxItems: 1
>
> Drop this as that is already defined for uint32.
>
> It also doesn't actually work. The $ref has to be under an 'allOf' if
> you have additional schemas. A quirk of json-schema...
>
> > +
> > + offset:
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + description: Offset in the register map for the reboot register (in bytes).
> > + maxItems: 1
> > +
> > + regmap:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description: Phandle to the register map node.
> > + maxItems: 1
> > +
> > + value:
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + description: The reset value written to the reboot register (32 bit access).
> > + maxItems: 1
> > +
> > +required:
> > + - compatible
> > + - regmap
> > + - offset
> > +
> > +allOf:
> > + - if:
> > + properties:
> > + value:
> > + not:
> > + type: array
>
> I think you could make this a bit more readable with:
>
> if:
> not:
> required:
> - value

I do not understand how does it work (value is not mentioned in the
required fields so why checking of it?)... but it works fine.

> However, if the tree is free of legacy usage, then you could just drop all this.

One of them - mask or value - has to be provided.

Thanks for review,
Kryzsztof

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