Re: [v4 06/11] dt-binding: pmu: Add RISC-V PMU DT bindings

[Rob Herring <robh@kernel.org>]

On Mon, Oct 25, 2021 at 12:53:45PM -0700, Atish Patra wrote:
> This patch adds the DT bindings for RISC-V PMU driver. It also defines
> the interrupt related properties to allow counter overflow interrupt.
> 
> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> ---
>  .../devicetree/bindings/perf/riscv,pmu.yaml   | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/perf/riscv,pmu.yaml
> 
> diff --git a/Documentation/devicetree/bindings/perf/riscv,pmu.yaml b/Documentation/devicetree/bindings/perf/riscv,pmu.yaml
> new file mode 100644
> index 000000000000..497caad63f16
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/perf/riscv,pmu.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pmu/riscv,pmu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: RISC-V PMU
> +
> +maintainers:
> +  - Atish Patra <atish.patra@wdc.com>
> +
> +description:
> +  The "Sscofpmf" extension allows the RISC-V PMU counters to overflow and
> +  generate a local interrupt so that event sampling can be done from user-space.
> +  The above said ISA extension is an optional extension to maintain backward
> +  compatibility and will be included in privilege specification v1.12 . That's
> +  why the interrupt property is marked as optional. The platforms with sscofpmf
> +  extension should add this property to enable event sampling.
> +  The device tree node with the compatible string is mandatory for any platform
> +  that wants to use pmu counter start/stop methods using SBI PMU extension.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - riscv,pmu

Only 1 version? Every implementation detail is discoverable in other 
ways?

> +
> +    description:
> +      Should be "riscv,pmu".

Don't write free form text of what the schema says.

> +
> +  interrupts-extended:
> +    minItems: 1
> +    maxItems: 4095
> +
> +additionalProperties: false
> +
> +required:
> +  - None
> +optional:

No a json-schema keyword.

> +  - compatible
> +  - interrupts-extended
> +
> +examples:
> +  - |
> +    pmu {
> +      compatible = "riscv,pmu";
> +      interrupts-extended = <&cpu0intc 13>,
> +                            <&cpu1intc 13>,
> +                            <&cpu2intc 13>,
> +                            <&cpu3intc 13>;
> +    };
> +...
> -- 
> 2.31.1
> 
>