linux-kernel - Re: [PATCH v3 1/2] dt-bindings: clock: Add Qualcomm SC8280XP GCC bindings

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Date:   Thu, 28 Apr 2022 08:28:13 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: clock: Add Qualcomm SC8280XP GCC
 bindings

On 27/04/2022 01:24, Bjorn Andersson wrote:
> Add binding for the Qualcomm SC8280XP Global Clock controller.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v2:
> - Dropped clock-names, in favor of forcing implementation to rely on index
>   based clock matching.

Implementation does not have to use clock-names, but it's useful for
humans. You can drop it, but I think it makes life of reviewing DTS more
difficult.

> - Updated descriptions for a few clocks that only had their clock names.
> 
>  .../bindings/clock/qcom,gcc-sc8280xp.yaml     | 129 +++++
>  include/dt-bindings/clock/qcom,gcc-sc8280xp.h | 496 ++++++++++++++++++
>  2 files changed, 625 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/qcom,gcc-sc8280xp.yaml
>  create mode 100644 include/dt-bindings/clock/qcom,gcc-sc8280xp.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc-sc8280xp.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc-sc8280xp.yaml
> new file mode 100644
> index 000000000000..bf4f9dd3ec85
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc-sc8280xp.yaml
> @@ -0,0 +1,129 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/qcom,gcc-sc8280xp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Global Clock & Reset Controller Binding for SC8280xp
> +
> +maintainers:
> +  - Bjorn Andersson <bjorn.andersson@...aro.org>
> +
> +description: |
> +  Qualcomm global clock control module which supports the clocks, resets and
> +  power domains on SC8280xp.
> +
> +  See also:
> +  - dt-bindings/clock/qcom,gcc-sc8280xp.h

Still not a full path. It makes it more difficult to validate whether
the path exists or not. You can put it in <> if you prefer to skip include.

> +
> +properties:
> +  compatible:
> +    const: qcom,gcc-sc8280xp
> +
> +  clocks:
> +    items:
> +      - description: XO reference clock
> +      - description: Sleep clock
> +      - description: UFS memory first RX symbol clock
> +      - description: UFS memory second RX symbol clock
> +      - description: UFS memory first TX symbol clock
> +      - description: UFS card first RX symbol clock
> +      - description: UFS card second RX symbol clock
> +      - description: UFS card first TX symbol clock
> +      - description: Primary USB SuperSpeed pipe clock
> +      - description: USB4 PHY pipegmux clock source
> +      - description: USB4 PHY DP gmux clock source
> +      - description: USB4 PHY sys piegmux clock source
> +      - description: USB4 PHY PCIe pipe clock
> +      - description: USB4 PHY router max pipe clock
> +      - description: Primary USB4 RX0 clock
> +      - description: Primary USB4 RX1 clock
> +      - description: Secondary USB SuperSpeed pipe clock
> +      - description: Second USB4 PHY pipegmux clock source
> +      - description: Second USB4 PHY DP gmux clock source
> +      - description: Second USB4 PHY sys pipegmux clock source
> +      - description: Second USB4 PHY PCIe pipe clock
> +      - description: Second USB4 PHY router max pipe clock
> +      - description: Secondary USB4 RX0 clock
> +      - description: Secondary USB4 RX0 clock

Duplicated name. RX1?

> +      - description: Multiport USB first SupserSpeed pipe clock
> +      - description: Multiport USB second SuperSpeed pipe clock
> +      - description: PCIe 2a pipe clock
> +      - description: PCIe 2b pipe clock
> +      - description: PCIe 3a pipe clock
> +      - description: PCIe 3b pipe clock
> +      - description: PCIe 4 pipe clock
> +      - description: First EMAC controller reference clock
> +      - description: Second EMAC controller reference clock
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  '#reset-cells':
> +    const: 1
> +
> +  '#power-domain-cells':
> +    const: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  protected-clocks:
> +    description:
> +      Protected clock specifier list as per common clock binding.

No need for description. You need maxItems, though.


Best regards,
Krzysztof