linux-kernel - Re: [PATCH 01/12] dt-bindings: panel: Add Samsung SOFEF00 DDIC with panel

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Message-ID: <be1b6e34-40ab-4587-8dbe-84e08bf83dcb@linaro.org>
Date: Fri, 7 Nov 2025 12:23:13 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, David Heidelberg <david@...t.cz>
Cc: Jessica Zhang <jessica.zhang@....qualcomm.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Thierry Reding
 <thierry.reding@...il.com>, Sam Ravnborg <sam@...nborg.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Casey Connolly <casey.connolly@...aro.org>, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, phone-devel@...r.kernel.org
Subject: Re: [PATCH 01/12] dt-bindings: panel: Add Samsung SOFEF00 DDIC with
 panel

On 11/6/25 09:48, Krzysztof Kozlowski wrote:
> On Tue, Nov 04, 2025 at 11:16:09PM +0100, David Heidelberg wrote:
>> Basic description for S6E3FC2X01 DDIC with attached panels
>>
>>   - Samsung AMS601NT22 6.01 inch, 1080x2160 pixels, 18:9 ratio
>>   - Samsung AMS628NW01 6.28 inch, 1080x2280 pixels, 19:9 ratio
>>
>> This panel has three supplies, while panel-simple-dsi is limited to one.
>> There is no user of this compatible, nor the compatible make sense.
> 
> There are. git grep samsung,sofef00, gives me two users.

Hmm, on -next I only see a single one:

$ grep samsung,sofef00 arch/*/boot/dts/ -R
arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts:  compatible = "samsung,sofef00";

> 
>> Remove it from simple DSI panel definitions.

Can't you mark is deprecated at first ?

>>
>> Signed-off-by: David Heidelberg <david@...t.cz>
> 
> ..
> 
>>   additionalProperties: false
>>   
>>   required:
>>     - compatible
>> +  - power-supply
>>     - reg
>>   
>>   examples:
>> diff --git a/Documentation/devicetree/bindings/display/panel/samsung,sofef00.yaml b/Documentation/devicetree/bindings/display/panel/samsung,sofef00.yaml
>> new file mode 100644
>> index 0000000000000..527a10e3b798e
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/panel/samsung,sofef00.yaml
>> @@ -0,0 +1,83 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/display/panel/samsung,sofef00.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Samsung SOFEF00 AMOLED DDIC
>> +
>> +description: The SOFEF00 is display driver IC with connected panel.
> 
> Description goes below maintainers, see example-schema.
> 
>> +
>> +maintainers:
>> +  - David Heidelberg <david@...t.cz>
>> +
>> +allOf:
>> +  - $ref: panel-common.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - enum:
>> +            # Samsung 6.01 inch, 1080x2160 pixels, 18:9 ratio
>> +          - samsung,sofef00-ams601nt22
>> +            # Samsung 6.28 inch, 1080x2280 pixels, 19:9 ratio
>> +          - samsung,sofef00-ams628nw01
> 
> These were not in the old binding, so please explain in the commit msg
> reasons for adding new front compatibles.
> 
>> +      - const: samsung,sofef00
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  reset-gpios: true
> 
> Drop, not needed. It can stay required, though.
> 
>> +
>> +  port: true
> 
> Drop
> 
>> +
>> +  vddio-supply:
>> +    description: VDD regulator
>> +
>> +  vci-supply:
>> +    description: VCI regulator
>> +
>> +  poc-supply:
>> +    description: POC regulator
> 
> 1st poc, then vci then vddio to keep it more-or-less sorted. Same in
> required list.
> 
>> +
>> +required:
>> +  - compatible
>> +  - reset-gpios
>> +  - vddio-supply
>> +  - vci-supply
>> +  - poc-supply
>> +
>> +unevaluatedProperties: false
> 
> Best regards,
> Krzysztof
>