linux-kernel - Re: [PATCH v2 3/3] dt-bindings: phy: qcom-qusb2: Add SC7180 QUSB2 phy support

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Date:   Wed, 18 Dec 2019 11:09:31 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Sandeep Maheswaram <sanm@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v2 3/3] dt-bindings: phy: qcom-qusb2: Add SC7180 QUSB2 phy support

Hi,

On Wed, Dec 4, 2019 at 8:43 PM Sandeep Maheswaram <sanm@...eaurora.org> wrote:
>
> Add QUSB2 phy entries for SC7180 in device tree bindings.
>
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> ---
>  Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml b/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml
> index 3ef94bc..5eff9016 100644
> --- a/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml
> @@ -18,6 +18,7 @@ properties:
>      enum:
>        - qcom,msm8996-qusb2-phy
>        - qcom,msm8998-qusb2-phy
> +      - qcom,sc7180-qusb2-phy
>        - qcom,sdm845-qusb2-phy

I would propose that we add generic PHY v2 tagging here, like this:

properties:
  compatible:
    anyOf:
      - items:
        - const: qcom,msm8996-qusb2-phy
      - items:
        - const: qcom,msm8998-qusb2-phy
      - items:
        # Suggested to also add "qcom,qusb2-v2-phy" as below.
        - const: qcom,sdm845-qusb2-phy
      - items:
        - enum:
          - qcom,sc7180-qusb2-phy
          - qcom,sdm845-qusb2-phy
        - const: qcom,qusb2-v2-phy

Given that this PHY has a fairly linear versioning within Qualcomm
(right?) this should make sense and should make code / adding new
device trees easier.  This is probably better than what I suggested in
the driver review [1] where I suggested that the compatible for sc7180
should be:

  compatible: "qcom,sc7180-qusb2-phy", "qcom,sdm845-qusb2-phy"


>    reg:
> @@ -66,7 +67,7 @@ properties:
>          It is a 6 bit value that specifies offset to be
>          added to PHY refgen RESCODE via IMP_CTRL1 register. It is a PHY
>          tuning parameter that may vary for different boards of same SOC.
> -        This property is applicable to only QUSB2 v2 PHY (sdm845).
> +        This property is applicable to only QUSB2 v2 PHY (sc7180, sdm845).

If you add my tagging, change this and other similar to just remove sdm845.


[1] https://lore.kernel.org/r/CAD=FV=W_z=_j==DSFbtCmTihmSyRtH85VnKpw03E=gATcqJx2Q@mail.gmail.com

-Doug