linux-hardening - Re: [PATCH v4 3/4] dt-bindings: interconnect: add clock property to enable QOS on SC7280

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Date: Tue, 26 Mar 2024 08:30:08 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Odelu Kukatla <quic_okukatla@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Georgi Djakov <djakov@...nel.org>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Kees Cook <keescook@...omium.org>, cros-qcom-dts-watchers@...omium.org,
 "Gustavo A . R . Silva" <gustavoars@...nel.org>,
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org, quic_rlaggysh@...cinc.com,
 quic_mdtipton@...cinc.com
Subject: Re: [PATCH v4 3/4] dt-bindings: interconnect: add clock property to
 enable QOS on SC7280

On 25/03/2024 19:16, Odelu Kukatla wrote:
> Added clock property to enable clocks required for accessing
> qos registers.
> 
> Signed-off-by: Odelu Kukatla <quic_okukatla@...cinc.com>
> ---
>  .../bindings/interconnect/qcom,sc7280-rpmh.yaml    | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,sc7280-rpmh.yaml b/Documentation/devicetree/bindings/interconnect/qcom,sc7280-rpmh.yaml
> index b135597d9489..950ecdd5252e 100644
> --- a/Documentation/devicetree/bindings/interconnect/qcom,sc7280-rpmh.yaml
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,sc7280-rpmh.yaml
> @@ -35,6 +35,10 @@ properties:
>    reg:
>      maxItems: 1
>  
> +  clocks:
> +    minItems: 1
> +    maxItems: 2

Why is this flexible? Nothing in commit msg explains that. I gave the
same talk twice, gave there examples, yet it is not enough...

https://elixir.bootlin.com/linux/v6.8/source/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml#L132

> +
>  required:
>    - compatible
>  
> @@ -57,6 +61,7 @@ unevaluatedProperties: false
>  
>  examples:
>    - |
> +    #include <dt-bindings/clock/qcom,gcc-sc7280.h>
>      interconnect {
>          compatible = "qcom,sc7280-clk-virt";
>          #interconnect-cells = <2>;
> @@ -69,3 +74,12 @@ examples:
>          #interconnect-cells = <2>;
>          qcom,bcm-voters = <&apps_bcm_voter>;

If all devices have clocks, then you could add them here. It seems not
all of them have clocks...

Best regards,
Krzysztof