linux-kernel - Re: [PATCH 1/2] dt-bindings: display: Add SSD133x OLED controllers

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Message-ID: <87fs00ms4b.fsf@minerva.mail-host-address-is-not-set>
Date: Sun, 17 Dec 2023 22:33:24 +0100
From: Javier Martinez Canillas <javierm@...hat.com>
To: Conor Dooley <conor@...nel.org>
Cc: linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>, Thomas
 Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, Peter
 Robinson <pbrobinson@...il.com>, Geert Uytterhoeven
 <geert@...ux-m68k.org>, Conor Dooley <conor+dt@...nel.org>, Daniel Vetter
 <daniel@...ll.ch>, David Airlie <airlied@...il.com>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Rob Herring <robh+dt@...nel.org>,
 devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] dt-bindings: display: Add SSD133x OLED controllers

Conor Dooley <conor@...nel.org> writes:

Hello Connor,

> On Sun, Dec 17, 2023 at 11:07:03AM +0100, Javier Martinez Canillas wrote:

[...]

>> +properties:
>> +  compatible:
>> +    enum:
>> +      - solomon,ssd1331
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +allOf:
>> +  - $ref: solomon,ssd-common.yaml#
>> +
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: solomon,ssd1331
>> +    then:
>> +      properties:
>> +        width:
>> +          default: 96
>> +        height:
>> +          default: 64
>
> Do you envisage a rake of devices that are going to end up in this
> binding? Otherwise, why not unconditionally set the constraints?
>

Because these are only for the default width and height, there can be
panels using the same controller but that have a different resolution.

For example, there are panels using the SSD1306 controller that have
128x32 [0], 64x32 [1] or 128x64 [2] resolutions.

But answering your question, yes I think that more devices for this
SSD133x family are going to be added later. Looking at [3], there is
at least SSD1333 that has a different default resolutions (176x176).

I think that even the SSD135x family could be supported by the same
modsetting pipeline, but I need to get one to figure it out.

[0]: https://es.aliexpress.com/item/1005003648174074.html
[1]: https://www.buydisplay.com/white-0-49-inch-oled-display-64x32-iic-i2c-ssd1306-connector-fpc
[2]: https://es.aliexpress.com/item/1005001582340858.html?gatewayAdapt=glo2esp
[3]: https://www.solomon-systech.com/product-search/?technology=oled-display

> Cheers,
> Conor.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat