linux-kernel - Re: [PATCH v2 1/2] dt-bindings: drm/bridge: MHDP8546 bridge binding changes for HDCP

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Message-ID: <YD0LKg3Jl5nauMqF@pendragon.ideasonboard.com>
Date:   Mon, 1 Mar 2021 17:41:30 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Parshuram Thombare <pthombar@...ence.com>
Cc:     robert.foss@...aro.org, robh+dt@...nel.org, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        a.hajda@...sung.com, narmstrong@...libre.com, nikhil.nd@...com,
        kishon@...com, sjakhade@...ence.com, mparab@...ence.com
Subject: Re: [PATCH v2 1/2] dt-bindings: drm/bridge: MHDP8546 bridge binding
 changes for HDCP

Hi Parshuram,

Thank you for the patch.

On Mon, Mar 01, 2021 at 12:22:26PM +0100, Parshuram Thombare wrote:
> Add binding changes for HDCP in the MHDP8546 DPI/DP bridge binding.
> This binding is not used in any upstreamed DTS yet, so changing
> index of property 'j721e-intg' should not affect anything.
> 
> Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
> ---
>  .../display/bridge/cdns,mhdp8546.yaml         | 29 ++++++++++++-------
>  1 file changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
> index 63427878715e..5fdadadaac16 100644
> --- a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
> @@ -17,21 +17,24 @@ properties:
>        - ti,j721e-mhdp8546
>  
>    reg:
> -    minItems: 1
> -    maxItems: 2
> +    minItems: 2
> +    maxItems: 3
>      items:
>        - description:
>            Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
>            The AUX and PMA registers are not part of this range, they are instead
>            included in the associated PHY.
> +      - description:
> +          Register block of mhdptx sapb registers.
>        - description:
>            Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
>  
>    reg-names:
> -    minItems: 1
> -    maxItems: 2
> +    minItems: 2
> +    maxItems: 3
>      items:
>        - const: mhdptx
> +      - const: mhdptx-sapb
>        - const: j721e-intg
>  
>    clocks:
> @@ -53,6 +56,11 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  hdcp-config:
> +    maxItems: 1
> +    description:
> +      HDCP version supported. Bit [0]:HDCP2.2 [1]:HDCP1.4.
> +

Is this a property of the hardware, that is, are there multiple versions
of this IP core covered by the same compatible string that support HDCP
1.4 only, DHCP 2.2 only or both ? Or is it a way to select what a given
system will offer ?

>    interrupts:
>      maxItems: 1
>  
> @@ -98,15 +106,15 @@ allOf:
>      then:
>        properties:
>          reg:
> -          minItems: 2
> +          minItems: 3
>          reg-names:
> -          minItems: 2
> +          minItems: 3
>      else:
>        properties:
>          reg:
> -          maxItems: 1
> +          maxItems: 2
>          reg-names:
> -          maxItems: 1
> +          maxItems: 2
>  
>  required:
>    - compatible
> @@ -129,8 +137,9 @@ examples:
>  
>          mhdp: dp-bridge@...b000000 {
>              compatible = "cdns,mhdp8546";
> -            reg = <0xf0 0xfb000000 0x0 0x1000000>;
> -            reg-names = "mhdptx";
> +            reg = <0xf0 0xfb000000 0x0 0x1000000>,
> +                  <0x0 0x4f48000 0x0 0x74>;
> +            reg-names = "mhdptx", "mhdptx-sapb";
>              clocks = <&mhdp_clock>;
>              phys = <&dp_phy>;
>              phy-names = "dpphy";

-- 
Regards,

Laurent Pinchart