linux-kernel - Re: [PATCH v14 5/7] dt-bindings: phy: Add Freescale iMX8MQ DP and HDMI PHY

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Message-ID: <10421561.nUPlyArG6x@steina-w>
Date: Tue, 20 Feb 2024 11:06:54 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: dmitry.baryshkov@...aro.org, andrzej.hajda@...el.com, neil.armstrong@...aro.org, Laurent.pinchart@...asonboard.com, jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com, daniel@...ll.ch, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com, vkoul@...nel.org, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, Sandor Yu <Sandor.yu@....com>
Cc: kernel@...gutronix.de, linux-imx@....com, Sandor.yu@....com, oliver.brown@....com, sam@...nborg.org, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v14 5/7] dt-bindings: phy: Add Freescale iMX8MQ DP and HDMI PHY

Hi,

thanks for the update.

Am Dienstag, 20. Februar 2024, 04:23:53 CET schrieb Sandor Yu:
> Add bindings for Freescale iMX8MQ DP and HDMI PHY.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
> v9->v14:
>  *No change.
> 
>  .../bindings/phy/fsl,imx8mq-dp-hdmi-phy.yaml  | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/fsl,imx8mq-dp-hdmi-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8mq-dp-hdmi-phy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8mq-dp-hdmi-phy.yaml
> new file mode 100644
> index 0000000000000..917f113503dca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/fsl,imx8mq-dp-hdmi-phy.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/fsl,imx8mq-dp-hdmi-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cadence HDP-TX DP/HDMI PHY for Freescale i.MX8MQ SoC
> +
> +maintainers:
> +  - Sandor Yu <sandor.yu@....com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,imx8mq-dp-phy
> +      - fsl,imx8mq-hdmi-phy

While reading cdns-mhdp8501-core.c I'm not so sure about this. There is
only a single PHY which can be configured for either DP or HDMI.
Using separate compatibles for that somehow bugs me.
Maybe the DT maintainers can add some input if this should be single
or double compatibles.

Thanks and best regards,
Alexander

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: PHY reference clock.
> +      - description: APB clock.
> +
> +  clock-names:
> +    items:
> +      - const: ref
> +      - const: apb
> +
> +  "#phy-cells":
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mq-clock.h>
> +    #include <dt-bindings/phy/phy.h>
> +    dp_phy: phy@...00000 {
> +        compatible = "fsl,imx8mq-dp-phy";
> +        reg = <0x32c00000 0x100000>;
> +        #phy-cells = <0>;
> +        clocks = <&hdmi_phy_27m>, <&clk IMX8MQ_CLK_DISP_APB_ROOT>;
> +        clock-names = "ref", "apb";
> +    };
> 


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