linux-kernel - Re: [RFC 1/3] dt-bindings: usb: qcom,dwc3: Add support for multiple power-domains

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Message-ID: <86371fc0-ef49-4dc9-b98c-7c5131cd1227@linaro.org>
Date: Tue, 5 Mar 2024 18:07:29 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Sriram Dash <quic_sriramd@...cinc.com>, andersson@...nel.org,
 konrad.dybcio@...aro.org, vkoul@...nel.org, kishon@...nel.org,
 robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 gregkh@...uxfoundation.org, quic_wcheng@...cinc.com,
 Thinh.Nguyen@...opsys.com, p.zabel@...gutronix.de,
 linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-usb@...r.kernel.org, quic_psodagud@...cinc.com,
 quic_nkela@...cinc.com, manivannan.sadhasivam@...aro.org,
 ulf.hansson@...aro.org, sudeep.holla@....com, quic_shazhuss@...cinc.com
Subject: Re: [RFC 1/3] dt-bindings: usb: qcom,dwc3: Add support for multiple
 power-domains

On 05/03/2024 17:57, Sriram Dash wrote:
> Some target systems allow multiple resources to be managed by firmware.
> On these targets, tasks related to clocks, regulators, resets, and
> interconnects can be delegated to the firmware, while the remaining
> responsibilities are handled by Linux.
> 
> To support the management of partial resources in Linux and leave the rest
> to firmware, multiple power domains are introduced. Each power domain can
> manage one or more resources, depending on the specific use case.
> 
> These power domains handle SCMI calls to the firmware, enabling the
> activation and deactivation of firmware-managed resources.
> 
> Signed-off-by: Sriram Dash <quic_sriramd@...cinc.com>
> ---
>  .../phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml        | 74 ++++++++++++++++------
>  .../bindings/phy/qcom,usb-snps-femto-v2.yaml       | 49 ++++++++++++--
>  .../devicetree/bindings/usb/qcom,dwc3.yaml         | 37 ++++++++++-
>  3 files changed, 130 insertions(+), 30 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml
> index 1e2d4dd..53b9ba9 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml
> @@ -44,7 +44,32 @@ properties:
>      maxItems: 5
>  
>    power-domains:
> -    maxItems: 1
> +    description: specifies a phandle to PM domain provider node

Please drop all redundant descriptions. Adding them is not even related
to this patch.

> +    minItems: 1
> +    maxItems: 2
> +
> +  power-domain-names:
> +    description:
> +      A list of power domain name strings sorted in the same order as the
> +      power-domains property.
> +
> +      For platforms where some resource are firmware managed, the name
> +      corresponding to the index of an SCMI domain provider can be
> +      "usb_core" or "usb_transfer".
> +    items:
> +      - const: usb_core
> +      - const: usb_transfer

How is this related to fw-managed? I fail to see it. Don't mix
independent problems in one patch.

> +
> +  qmp,fw-managed:

Please do not upstream vendor code directly, but perform basic
adjustment to upstream Linux kernel. There is no such company as gmp.

Run this first through your internal review process.

> +    description:
> +      Some targets allow multiple resources to be managed by firmware.

You miss clear mapping between compatibles and this property - allOf
restricting it to specific SoCs.

Is this different property than qcom,controlled-remotely?

Best regards,
Krzysztof