linux-kernel - Re: [PATCH v1 2/6] dt-bindings: display: bridge: toshiba,tc358768: Add TC9594

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Message-ID: <f224159b-a5cd-e2f3-c34a-acc1de343cf8@linaro.org>
Date:   Fri, 31 Mar 2023 11:33:58 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Francesco Dolcini <francesco@...cini.it>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        dri-devel@...ts.freedesktop.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        devicetree@...r.kernel.org,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/6] dt-bindings: display: bridge: toshiba,tc358768:
 Add TC9594

On 31/03/2023 11:30, Francesco Dolcini wrote:
> On Fri, Mar 31, 2023 at 10:42:40AM +0200, Krzysztof Kozlowski wrote:
>> On 30/03/2023 11:59, Francesco Dolcini wrote:
>>> From: Francesco Dolcini <francesco.dolcini@...adex.com>
>>>
>>> Add TC9594, from the software point of view this is identical to
>>> TC358768 with the main difference being automotive qualified.
>>>
>>> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
>>> ---
>>>  .../devicetree/bindings/display/bridge/toshiba,tc358768.yaml | 5 +++--
>>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358768.yaml b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358768.yaml
>>> index d6dac186ac59..8f22093b61ae 100644
>>> --- a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358768.yaml
>>> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358768.yaml
>>> @@ -4,19 +4,20 @@
>>>  $id: http://devicetree.org/schemas/display/bridge/toshiba,tc358768.yaml#
>>>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>>>  
>>> -title: Toshiba TC358768/TC358778 Parallel RGB to MIPI DSI bridge
>>> +title: Toshiba TC358768/TC358778/TC9594 Parallel RGB to MIPI DSI bridge
>>>  
>>>  maintainers:
>>>    - Peter Ujfalusi <peter.ujfalusi@...com>
>>>  
>>>  description: |
>>> -  The TC358768/TC358778 is bridge device which converts RGB to DSI.
>>> +  The TC358768/TC358778/TC9594 is bridge device which converts RGB to DSI.
>>>  
>>>  properties:
>>>    compatible:
>>>      enum:
>>>        - toshiba,tc358768
>>>        - toshiba,tc358778
>>> +      - toshiba,tc9594
>>
>> If it is the same, why they are not compatible?
> 
> I assume I am not understanding something very basic ...
> 
> The register description and SW functionality of all these 3 parts is
> identical.
> 
> How should be the compatible described in the DT schema in this case?

Look at any board compatibles for example.

> 
> 
>> I got only three patches out of six, thus I cannot check by myself.
> 
> Here the whole series: https://lore.kernel.org/all/20230330095941.428122-1-francesco@dolcini.it/
> 
> Do you want to me to send the whole series and not just the DT binding
> next time? Happy to do it, if you prefer.

So NAK on 4th patch. Don't grow device ID tables needlessly.

Best regards,
Krzysztof