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

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Message-ID: <4bbaefae-1d10-461a-a7a2-61a052241028@ti.com>
Date: Fri, 5 Sep 2025 15:27:17 +0530
From: Harikrishna Shenoy <h-shenoy@...com>
To: Rob Herring <robh@...nel.org>
CC: <andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>, <rfoss@...nel.org>,
        <Laurent.pinchart@...asonboard.com>, <jonas@...boo.se>,
        <jernej.skrabec@...il.com>, <airlied@...il.com>, <simona@...ll.ch>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <sjakhade@...ence.com>, <yamonkar@...ence.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devarsht@...com>, <u-kumar1@...com>,
        <s-jain1@...com>
Subject: Re: [PATCH v2] dt-bindings: drm/bridge: MHDP8546 bridge binding
 changes for DSC


On 9/4/25 03:33, Rob Herring wrote:
> On Wed, Sep 03, 2025 at 04:43:57PM +0530, Harikrishna Shenoy wrote:
>> From: Swapnil Jakhade <sjakhade@...ence.com>
>>
>> Add binding changes for DSC(Display Stream Compression) in the MHDP8546
>> DPI/DP bridge.
>>
>> Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
>> Signed-off-by: Harikrishna Shenoy <h-shenoy@...com>
>> ---
>>   .../bindings/display/bridge/cdns,mhdp8546.yaml        | 11 +++++++----
>>   1 file changed, 7 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
>> index c2b369456e4e..6e749c002669 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
>> +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
>> @@ -27,6 +27,8 @@ properties:
>>             Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
>>         - description:
>>             Register block of mhdptx sapb registers.
>> +      - description:
>> +          Register block for mhdptx DSC encoder registers.
>>   
>>     reg-names:
>>       minItems: 1
>> @@ -34,6 +36,7 @@ properties:
>>         - const: mhdptx
>>         - const: j721e-intg
>>         - const: mhdptx-sapb
>> +      - const: mhdptx-dsc
> 'mhdptx' is redundant. Don't continue that pattern. Just 'dsc'.

so sequence should be mhdptx, j721e-intg, mhdptx-sapb, dsc?


>
>>   
>>     clocks:
>>       maxItems: 1
>> @@ -100,18 +103,18 @@ allOf:
>>         properties:
>>           reg:
>>             minItems: 2
>> -          maxItems: 3
>> +          maxItems: 4
>>           reg-names:
>>             minItems: 2
>> -          maxItems: 3
>> +          maxItems: 4
>>       else:
>>         properties:
>>           reg:
>>             minItems: 1
>> -          maxItems: 2
>> +          maxItems: 3
>>           reg-names:
>>             minItems: 1
>> -          maxItems: 2
>> +          maxItems: 3
> Have you tested this works? While it might work for TI with the
> j721e-intg registers in the middle, it won't work for platforms without
> them. You're going to have to have 2 lists of reg-names.
>
> Rob
>
I will add two lists one with and one without j721e-integ in the 'if' 
condtional