linux-kernel - Re: [PATCH v3 1/2] dt-bingings:arm:sunplus:add sp7021 compatible string to sunplus,idle-state.yaml

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Date:   Tue, 11 Jan 2022 19:39:30 -0600
From:   Rob Herring <robh@...nel.org>
To:     Edwin Chiu <edwinchiu0505tw@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, daniel.lezcano@...aro.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bingings:arm:sunplus:add sp7021 compatible
 string to sunplus,idle-state.yaml

On Thu, Jan 06, 2022 at 10:00:07AM +0800, Edwin Chiu wrote:
> Add the compatible string for cpuidle state on sp7021
> 
> Signed-off-by: Edwin Chiu <edwinchiu0505tw@...il.com>
> ---
> Changes in v3
>  - Align email address of sob and sender
>  - Added sp7021 compatible string
> 
>  .../bindings/arm/sunplus/sunplus,idle-state.yaml   | 59 ++++++++++++++++++++++
>  MAINTAINERS                                        |  5 ++
>  2 files changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/sunplus/sunplus,idle-state.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/sunplus/sunplus,idle-state.yaml b/Documentation/devicetree/bindings/arm/sunplus/sunplus,idle-state.yaml
> new file mode 100644
> index 0000000..64281ba
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/sunplus/sunplus,idle-state.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) Sunplus Co., Ltd. 2021
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/sunplus/sunplus,idle-state.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sunplus SOC cpuidle state
> +
> +maintainers:
> +  - Edwin Chiu<edwinchiu0505tw@...il.com>
> +
> +description: |
> +  Sunplus SOC cpuidle state
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - sunplus,sp7021-idle-state
> +
> +  entry-latency-us:
> +    description:
> +      Worst case latency in microseconds required to enter the idle state.
> +
> +  exit-latency-us:
> +    description:
> +      Worst case latency in microseconds required to exit the idle state.
> +      The exit-latency-us duration may be guaranteed only after
> +      entry-latency-us has passed.
> +
> +  min-residency-us:
> +    description:
> +      Minimum residency duration in microseconds, inclusive of preparation
> +      and entry, for this idle state to be considered worthwhile energy wise
> +      (refer to section 2 of this document for a complete description).
> +
> +required:
> +  - compatible
> +  - entry-latency-us
> +  - exit-latency-us
> +  - min-residency-us
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +
> +    idle-state {
> +      CPU_IDLE: cpu_idle {
> +        compatible = "sunplus,sp7021-idle-state";
> +        entry-latency-us = <8000>;
> +        exit-latency-us = <700>;
> +        min-residency-us = <9000>;
> +      };
> +    };

Again, this is no different than the generic binding. There is no need 
for this binding. Just wanting a different driver is not a reason for a 
duplicate schema.

Rob