linux-kernel - Re: [PATCH v2 1/3] dt-bindings: power: rpmpd: Add MSM8974 power domains

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Date: Sun, 11 Feb 2024 12:03:15 +0100
From: Stephan Gerhold <stephan@...hold.net>
To: Luca Weiss <luca@...tu.xyz>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Matti Lehtimäki <matti.lehtimaki@...il.com>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: power: rpmpd: Add MSM8974 power
 domains

On Sat, Feb 10, 2024 at 05:38:56PM +0100, Luca Weiss wrote:
> Add the compatibles and indexes for the rpmpd in MSM8974, both with the
> standard PM8841+PM8941 PMICs but also devices found with PMA8084.
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>  Documentation/devicetree/bindings/power/qcom,rpmpd.yaml | 2 ++
>  include/dt-bindings/power/qcom-rpmpd.h                  | 7 +++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
> index 2ff246cf8b81..929b7ef9c1bc 100644
> --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
> @@ -24,6 +24,8 @@ properties:
>            - qcom,msm8917-rpmpd
>            - qcom,msm8939-rpmpd
>            - qcom,msm8953-rpmpd
> +          - qcom,msm8974-rpmpd
> +          - qcom,msm8974pro-pma8084-rpmpd
>            - qcom,msm8976-rpmpd
>            - qcom,msm8994-rpmpd
>            - qcom,msm8996-rpmpd

This is maybe more something for the DT reviewers to decide but I wonder
if it is a bit confusing/misleading to describe one particular PMIC with
a generic compatible, and the other with a more specific one. Perhaps it
would be clearer to include the PMIC name in both compatibles, i.e.
"qcom,msm8974-pm8941-rpmpd" instead of "qcom,msm8974-rpmpd".

The "qcom,msm8974-rpmpd" compatible could be maybe added as fallback.
While it wouldn't be used for matching in the (Linux) driver the DT
binding itself *is* "compatible" between the two PMICs because they both
have the same power domain indexes.

i.e.
	compatible = "qcom,msm8974-pm8941-rpmpd", "qcom,msm8974-rpmpd";
	compatible = "qcom,msm8974pro-pma8084-rpmpd", "qcom,msm8974-rpmpd";

Thanks,
Stephan