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Date: Mon, 22 Apr 2024 22:56:33 +0200
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Subject: Re: [PATCH 2/2] dt-bindings: panel-simple-dsi: Add generic panel-dsi
To: Johan Adolfsson <Johan.Adolfsson@axis.com>,
 Neil Armstrong <neil.armstrong@linaro.org>,
 Jessica Zhang <quic_jesszhan@quicinc.com>, Sam Ravnborg <sam@ravnborg.org>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Thierry Reding <thierry.reding@gmail.com>
Cc: "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
 kernel <kernel@axis.com>
References: <20240418-foo-fix-v1-0-461bcc8f5976@axis.com>
 <20240418-foo-fix-v1-2-461bcc8f5976@axis.com>
 <c739a512-9a75-4f48-b5ef-801191c298f5@linaro.org>
 <PAWPR02MB928111F5EEB4A46B56A89B239B122@PAWPR02MB9281.eurprd02.prod.outlook.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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On 22/04/2024 16:34, Johan Adolfsson wrote:
> 
> 
> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> 
> Sent: den 19 april 2024 01:05
> To: Johan Adolfsson <Johan.Adolfsson@axis.com>; Neil Armstrong <neil.armstrong@linaro.org>; Jessica Zhang <quic_jesszhan@quicinc.com>; Sam Ravnborg <sam@ravnborg.org>; Maarten Lankhorst <maarten.lankhorst@linux.intel.com>; Maxime Ripard <mripard@kernel.org>; Thomas Zimmermann <tzimmermann@suse.de>; David Airlie <airlied@gmail.com>; Daniel Vetter <daniel@ffwll.ch>; Rob Herring <robh+dt@kernel.org>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>; Conor Dooley <conor+dt@kernel.org>; Thierry Reding <thierry.reding@gmail.com>
> Cc: dri-devel@lists.freedesktop.org; linux-kernel@vger.kernel.org; devicetree@vger.kernel.org; kernel <kernel@axis.com>
> Subject: Re: [PATCH 2/2] dt-bindings: panel-simple-dsi: Add generic panel-dsi
> 
>> On 18/04/2024 16:01, Johan Adolfsson wrote:
>>> panel-dsi is similar to panel-dpi with overridable timings
>>
>> ???
> 
> I guess a more correct description would be 
> "panel-dsi is a fallback in a similar way that panel-dpi is in panel-dpi.yaml .."?

I meant how does it explain the hardware.

> 
> ...
>>> a/Documentation/devicetree/bindings/display/panel/panel-simple-dsi.yam
>>> l
>>> +++ b/Documentation/devicetree/bindings/display/panel/panel-simple-dsi
>>> +++ .yaml
>>> @@ -56,6 +56,8 @@ properties:
>>>        - samsung,sofef00
>>>          # Shangai Top Display Optoelectronics 7" TL070WSH30 1024x600 TFT LCD panel
>>>        - tdo,tl070wsh30
>>> +        # Generic dsi panel with timing overridable
>>> +      - panel-dsi
>>
>> ? Devices are not generic. This is very confusing and commit msg does not help me. Compatibles *must* be specific, see writing-bindings.
> 
> I guess I see this a generic fallback, that handles any dsi panel as long as the correct timing etc is specified in devictree, similar to what panel-dpi is in panel-dpi.yaml
> Maybe phrasing it similar to panel-dpi.yaml is better?

But panel-dpi is quite different. You always have two compatibles. I
don't see two compatibles here.

Best regards,
Krzysztof