Re: [DO NOT MERGE v6 24/37] dt-binding: sh: cpus: Add SH CPUs json-schema

[Conor Dooley]

Yo,

On Tue, Jan 09, 2024 at 05:23:21PM +0900, Yoshinori Sato wrote:
> Renesas SH series and compatible ISA CPUs.
> 
> Signed-off-by: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> ---
>  .../devicetree/bindings/sh/cpus.yaml          | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sh/cpus.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sh/cpus.yaml b/Documentation/devicetree/bindings/sh/cpus.yaml
> new file mode 100644
> index 000000000000..c04f897d2c2a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sh/cpus.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sh/cpus.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas SuperH CPUs
> +
> +maintainers:
> +  - Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> +
> +description: |+
> +  The device tree allows to describe the layout of CPUs in a system through
> +  the "cpus" node, which in turn contains a number of subnodes (ie "cpu")
> +  defining properties for every cpu.
> +
> +  Bindings for CPU nodes follow the Devicetree Specification, available from:
> +
> +  https://www.devicetree.org/specifications/

You likely copied this description from the arm binding (or from
dt-schema), but I don't think this is anything other than a statement of
the obvious. If there is a description here it should (IMO) talk about
the superh cpus.

> +
> +properties:
> +  compatible:
> +    anyOf:
> +      - items:
> +          - enum:
> +              - renesas,sh2a
> +              - renesas,sh3
> +              - renesas,sh4
> +              - renesas,sh4a
> +              - jcore,j2
> +          - const: renesas,sh2
> +      - const: renesas,sh2
> +
> +  clock-frequency:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: CPU core clock frequency.

What is the point of this? You have a clocks property, can't you obtain
the clock frequency by looking up the provider of that clock?

> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names: true

Why do you need clock-names if you only have one clock?

> +
> +  reg:
> +    maxItems: 1
> +
> +  device_type: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - device_type
> +
> +additionalProperties: true

This should be unevaluatedProperties: false

Properties like the icache-size are documented in cpu.yaml and
you can add an reference to that to permit them. The riscv cpus binding
does this if you need to see how that works.

Cheers,
Conor.

> +examples:
> +  - |
> +    #include <dt-bindings/clock/sh7750-cpg.h>
> +    cpus {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        cpu: cpu@0 {
> +            compatible = "renesas,sh4", "renesas,sh2";
> +            device_type = "cpu";
> +            reg = <0>;
> +            clocks = <&cpg SH7750_CPG_ICK>;
> +            clock-names = "ick";
> +            icache-size = <16384>;
> +            icache-line-size = <32>;
> +            dcache-size = <32768>;
> +            dcache-line-size = <32>;
> +        };
> +    };
> +...
> -- 
> 2.39.2
>

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