linux-kernel - Re: [PATCH 1/7] dt-bindings: interconnect: Add Qualcomm MSM8976 DT bindings

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Date: Mon, 10 Jun 2024 14:50:41 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Adam Skladowski <a39.skl@...il.com>
Cc: phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
 Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Georgi Djakov <djakov@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] dt-bindings: interconnect: Add Qualcomm MSM8976 DT
 bindings

On 09/06/2024 20:20, Adam Skladowski wrote:
> Add bindings for Qualcomm MSM8976 Network-On-Chip interconnect devices.
> 
> Signed-off-by: Adam Skladowski <a39.skl@...il.com>

A nit, subject: drop second/last, redundant "DT bindings". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

> ---
>  .../bindings/interconnect/qcom,msm8976.yaml   | 107 ++++++++++++++++++
>  .../dt-bindings/interconnect/qcom,msm8976.h   |  97 ++++++++++++++++
>  2 files changed, 204 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interconnect/qcom,msm8976.yaml
>  create mode 100644 include/dt-bindings/interconnect/qcom,msm8976.h
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,msm8976.yaml b/Documentation/devicetree/bindings/interconnect/qcom,msm8976.yaml
> new file mode 100644
> index 000000000000..bc9d08443e7c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,msm8976.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interconnect/qcom,msm8976.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm MSM8976 Network-On-Chip interconnect
> +
> +maintainers:
> +  - Konrad Dybcio <konradybcio@...nel.org>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  The Qualcomm MSM8976 interconnect providers support adjusting the
> +  bandwidth requirements between the various NoC fabrics.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,msm8976-bimc
> +      - qcom,msm8976-pcnoc
> +      - qcom,msm8976-snoc
> +
> +  reg:
> +    maxItems: 1
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2

I know that other qcom bindings use that order (clock-names -> clocks),
but at least for new bindings let's keep it more logical, so please
first clocks then clock-names.

> +
> +patternProperties:
> +  '^interconnect-[a-z0-9\-]+$':
> +    type: object
> +    $ref: qcom,rpm-common.yaml#
> +    description:
> +      The interconnect providers do not have a separate QoS register space,
> +      but share parent's space.
> +
> +    allOf:
> +      - $ref: qcom,rpm-common.yaml#

Drop both lines.

> +
> +    properties:
> +      compatible:
> +        const: qcom,msm8976-snoc-mm
> +
> +    required:
> +      - compatible
> +
> +    unevaluatedProperties: false

Put it after $ref (before description).

> +
> +required:
> +  - compatible
> +  - reg
> +
> +unevaluatedProperties: false

This goes after entire allOf section

> +
> +allOf:
> +  - $ref: qcom,rpm-common.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          const: qcom,msm8976-snoc
> +
> +    then:
> +      properties:
> +        clocks:
> +          items:
> +            - description: IPA clock from RPMCC
> +        clock-names:
> +          const: ipa
> +
> +      required:
> +        - clocks
> +        - clock-names

Then why do you have two items? And what with clocks for other variants?
This is supposed to be fixed/specific for each device/variant.


> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,rpmcc.h>
> +    #include <dt-bindings/interconnect/qcom,rpm-icc.h>
> +
> +    bimc: interconnect@...000 {
> +        compatible = "qcom,msm8976-bimc";
> +        reg = <0x00400000 0x62000>;
> +        #interconnect-cells = <2>;
> +    };
> +
> +    pcnoc: interconnect@...000 {
> +        compatible = "qcom,msm8976-pcnoc";
> +        reg = <0x00500000 0x14000>;
> +        #interconnect-cells = <2>;
> +    };

Drop both nodes. The node below is enough as an example.


Best regards,
Krzysztof