linux-kernel - Re: [PATCH v3 3/3] dt-bindings: firmware: convert Qualcomm SCM binding to the yaml

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Date:   Sun, 26 Jun 2022 20:28:28 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     David Heidelberg <david@...t.cz>
Cc:     ~okias/devicetree@...ts.sr.ht, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Das Srinagesh <quic_gurus@...cinc.com>,
        Robert Marko <robimarko@...il.com>
Subject: Re: [PATCH v3 3/3] dt-bindings: firmware: convert Qualcomm SCM
 binding to the yaml

On 26/06/2022 19:13, David Heidelberg wrote:
> On 26/06/2022 18:45, Krzysztof Kozlowski wrote:
>> On 26/06/2022 13:46, David Heidelberg wrote:
>>> Convert Qualcomm SCM firmware binding to the yaml format.
>>>
>>> This commit also:
>>>   - adds qcom,scm-mdm9607 into list which has only core clock
>>>   - adds qcom,scm-sm6125, qcom,scm-ipq6018
>>>   - #reset-cells, because the property is already used
>>>
>>> Cc: Robert Marko <robimarko@...il.com>
>>> Cc: Guru Das Srinagesh <quic_gurus@...cinc.com>
>>> Signed-off-by: David Heidelberg <david@...t.cz>
>>> ---
>>> v3:
>>>   - add preceding patches for ARM and arm64 adding missing compatible strings
>>>   - extended with missing compatible strings
>>>   - added two additional maintainers, see https://lkml.org/lkml/2022/6/23/1969
>>> v2:
>>>   - changed maintainer to Bjorn
>>>   - document #reset-cells
>>>
>>>   .../devicetree/bindings/firmware/qcom,scm.txt |  57 --------
>>>   .../bindings/firmware/qcom,scm.yaml           | 131 ++++++++++++++++++
>>>   2 files changed, 131 insertions(+), 57 deletions(-)
>>>   delete mode 100644 Documentation/devicetree/bindings/firmware/qcom,scm.txt
>>>   create mode 100644 Documentation/devicetree/bindings/firmware/qcom,scm.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.txt b/Documentation/devicetree/bindings/firmware/qcom,scm.txt
>>> deleted file mode 100644
>>> index 0f4e5ab26477..000000000000
>>> --- a/Documentation/devicetree/bindings/firmware/qcom,scm.txt
>>> +++ /dev/null
>>> @@ -1,57 +0,0 @@
>>> -QCOM Secure Channel Manager (SCM)
>>> -
>>> -Qualcomm processors include an interface to communicate to the secure firmware.
>>> -This interface allows for clients to request different types of actions.  These
>>> -can include CPU power up/down, HDCP requests, loading of firmware, and other
>>> -assorted actions.
>>> -
>>> -Required properties:
>>> -- compatible: must contain one of the following:
>>> - * "qcom,scm-apq8064"
>>> - * "qcom,scm-apq8084"
>>> - * "qcom,scm-ipq4019"
>>> - * "qcom,scm-ipq806x"
>>> - * "qcom,scm-ipq8074"
>>> - * "qcom,scm-mdm9607"
>>> - * "qcom,scm-msm8226"
>>> - * "qcom,scm-msm8660"
>>> - * "qcom,scm-msm8916"
>>> - * "qcom,scm-msm8953"
>>> - * "qcom,scm-msm8960"
>>> - * "qcom,scm-msm8974"
>>> - * "qcom,scm-msm8976"
>>> - * "qcom,scm-msm8994"
>>> - * "qcom,scm-msm8996"
>>> - * "qcom,scm-msm8998"
>>> - * "qcom,scm-sc7180"
>>> - * "qcom,scm-sc7280"
>>> - * "qcom,scm-sdm845"
>>> - * "qcom,scm-sdx55"
>>> - * "qcom,scm-sm6350"
>>> - * "qcom,scm-sm8150"
>>> - * "qcom,scm-sm8250"
>>> - * "qcom,scm-sm8350"
>>> - * "qcom,scm-sm8450"
>>> - and:
>>> - * "qcom,scm"
>>> -- clocks: Specifies clocks needed by the SCM interface, if any:
>>> - * core clock required for "qcom,scm-apq8064", "qcom,scm-msm8660" and
>>> -   "qcom,scm-msm8960"
>>> - * core, iface and bus clocks required for "qcom,scm-apq8084",
>>> -   "qcom,scm-msm8916", "qcom,scm-msm8953", "qcom,scm-msm8974" and "qcom,scm-msm8976"
>>> -- clock-names: Must contain "core" for the core clock, "iface" for the interface
>>> -  clock and "bus" for the bus clock per the requirements of the compatible.
>>> -- qcom,dload-mode: phandle to the TCSR hardware block and offset of the
>>> -		   download mode control register (optional)
>>> -
>>> -Example for MSM8916:
>>> -
>>> -	firmware {
>>> -		scm {
>>> -			compatible = "qcom,msm8916", "qcom,scm";
>>> -			clocks = <&gcc GCC_CRYPTO_CLK> ,
>>> -				 <&gcc GCC_CRYPTO_AXI_CLK>,
>>> -				 <&gcc GCC_CRYPTO_AHB_CLK>;
>>> -			clock-names = "core", "bus", "iface";
>>> -		};
>>> -	};
>>> diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
>>> new file mode 100644
>>> index 000000000000..17d06e75b82b
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
>>> @@ -0,0 +1,131 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: "http://devicetree.org/schemas/firmware/qcom,scm.yaml#"
>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> No quotes here.
>>
>>> +
>>> +title: QCOM Secure Channel Manager (SCM)
>>> +
>>> +description: |
>>> +  Qualcomm processors include an interface to communicate to the secure firmware.
>>> +  This interface allows for clients to request different types of actions.
>>> +  These can include CPU power up/down, HDCP requests, loading of firmware,
>>> +  and other assorted actions.
>>> +
>>> +maintainers:
>>> +  - Bjorn Andersson <bjorn.andersson@...aro.org>
>>> +  - Robert Marko <robimarko@...il.com>
>>> +  - Guru Das Srinagesh <quic_gurus@...cinc.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - enum:
>>> +          - qcom,scm-apq8064
>>> +          - qcom,scm-apq8084
>>> +          - qcom,scm-ipq4019
>>> +          - qcom,scm-ipq6018
>>> +          - qcom,scm-ipq806x
>>> +          - qcom,scm-ipq8074
>>> +          - qcom,scm-mdm9607
>>> +          - qcom,scm-msm8226
>>> +          - qcom,scm-msm8660
>>> +          - qcom,scm-msm8916
>>> +          - qcom,scm-msm8953
>>> +          - qcom,scm-msm8960
>>> +          - qcom,scm-msm8974
>>> +          - qcom,scm-msm8976
>>> +          - qcom,scm-msm8994
>>> +          - qcom,scm-msm8996
>>> +          - qcom,scm-msm8998
>>> +          - qcom,scm-sc7180
>>> +          - qcom,scm-sc7280
>>> +          - qcom,scm-sdm845
>>> +          - qcom,scm-sdx55
>>> +          - qcom,scm-sm6125
>>> +          - qcom,scm-sm6350
>>> +          - qcom,scm-sm8150
>>> +          - qcom,scm-sm8250
>>> +          - qcom,scm-sm8350
>>> +          - qcom,scm-sm8450
>>> +          - qcom,scm-qcs404
>>> +      - const: qcom,scm
>>> +
>>> +  clocks:
>>> +    minItems: 1
>>> +    maxItems: 3
>>> +
>>> +  clock-names: true
>> You should have constraints here - min/maxItems.
>>
>>> +
>>> +  '#reset-cells':
>>> +    const: 1
>>> +
>>> +  qcom,dload-mode:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +    items:
>>> +      - items:
>>> +          - description: phandle to TCSR hardware block
>>> +          - description: offset of the download mode control register
>>> +    description:
>>> +      Should be phandle/offset pair.
>> This description is not helpful. Should be something closer to "TCSR
>> hardware block".
>>
>>> +
>>> +allOf:
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          contains:
>>> +            enum:
>>> +              - qcom,scm-apq8064
>>> +              - qcom,scm-mdm9607
>>> +              - qcom,scm-msm8660
>>> +              - qcom,scm-msm8960
>>> +    then:
>>> +      properties:
>>> +        clock-names:
>>> +          items:
>>> +            - const: core
>> Missing constraints (maxItems:2) for clocks.
> 
> Why 2? I would put `maxItems: 1` there
> 

Yes, of course, typo.

Best regards,
Krzysztof