linux-kernel - Re: [PATCH v3 1/2] dt-bindings: phy: Introduce Qualcomm eDP/DP PHY binding

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Message-ID: <YXF+YELFaQk+ouyH@ripper>
Date:   Thu, 21 Oct 2021 07:51:12 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        abhinavk@...eaurora.org, Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: phy: Introduce Qualcomm eDP/DP PHY
 binding

On Mon 18 Oct 12:48 PDT 2021, Rob Herring wrote:

> On Sat, Oct 16, 2021 at 04:21:27PM -0700, Bjorn Andersson wrote:
> > Introduce a binding for the eDP/DP PHY hardware block found in several
> > different Qualcomm platforms.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> > 
> > Changes since v2:
> > - None
> > 
> >  .../devicetree/bindings/phy/qcom,edp-phy.yaml | 69 +++++++++++++++++++
> >  1 file changed, 69 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml
> > new file mode 100644
> > index 000000000000..c258e4f7e332
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml
> > @@ -0,0 +1,69 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/phy/qcom,edp-phy.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: Qualcomm DP/eDP PHY
> > +
> > +maintainers:
> > +  - Bjorn Andersson <bjorn.andersson@...aro.org>
> > +
> > +description:
> > +  The Qualcomm DP/eDP PHY is found in a number of Qualcomm platform and
> > +  provides the physical interface for DisplayPort and Embedded Display Port.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - qcom,sc8180x-dp-phy
> > +      - qcom,sc8180x-edp-phy
> 
> Is there a difference between DP and eDP?
> 

It's the same hardware block, with the same inputs, but the two modes
requires different programming sequences. So I need some way to describe
which one this is.

> Perhaps note what that is if so.
> 

What are you suggesting?

Regards,
Bjorn

> > +
> > +  reg:
> > +    items:
> > +      - description: PHY base register block
> > +      - description: tx0 register block
> > +      - description: tx1 register block
> > +      - description: PLL register block
> > +
> > +  clocks:
> > +    maxItems: 2
> > +
> > +  clock-names:
> > +    items:
> > +      - const: aux
> > +      - const: cfg_ahb
> > +
> > +  "#clock-cells":
> > +    const: 1
> > +
> > +  "#phy-cells":
> > +    const: 0
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - "#clock-cells"
> > +  - "#phy-cells"
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    phy@...2a00 {
> > +      compatible = "qcom,sc8180x-edp-phy";
> > +      reg = <0x0aec2a00 0x1c0>,
> > +            <0x0aec2200 0xa0>,
> > +            <0x0aec2600 0xa0>,
> > +            <0x0aec2000 0x19c>;
> > +
> > +      clocks = <&dispcc 0>, <&dispcc 1>;
> > +      clock-names = "aux", "cfg_ahb";
> > +
> > +      #clock-cells = <1>;
> > +      #phy-cells = <0>;
> > +    };
> > +...
> > -- 
> > 2.29.2
> > 
> >