linux-kernel - Re: [PATCH 1/2] dt-bindings: display/panel: Add Lenovo NT36523W BOE panel

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Date:   Tue, 21 Feb 2023 03:13:31 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: display/panel: Add Lenovo NT36523W BOE
 panel



On 21.02.2023 03:08, Rob Herring wrote:
> On Fri, Feb 17, 2023 at 12:29:07PM +0100, Konrad Dybcio wrote:
>> Add bindings for the 2000x1200px IPS panel found on Lenovo Tab P11/
>> XiaoXin Pad devices.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  .../display/panel/lenovo,nt36523w-boe-j606.yaml    | 60 ++++++++++++++++++++++
>>  1 file changed, 60 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/panel/lenovo,nt36523w-boe-j606.yaml b/Documentation/devicetree/bindings/display/panel/lenovo,nt36523w-boe-j606.yaml
>> new file mode 100644
>> index 000000000000..43dcbe3f9f30
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/panel/lenovo,nt36523w-boe-j606.yaml
>> @@ -0,0 +1,60 @@
>> +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/display/panel/lenovo,nt36523w-boe-j606.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NT36523W BOE panel found on Lenovo J606 devices
>> +
>> +maintainers:
>> +  - Konrad Dybcio <konrad.dybcio@...aro.org>
>> +
>> +allOf:
>> +  - $ref: panel-common.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: lenovo,nt36523w-boe-j606
>> +
>> +  reg:
>> +    maxItems: 1
>> +    description: DSI virtual channel
>> +
>> +  vddio-supply: true
> 
> If only one supply, why not use panel-simple-dsi.yaml? Though probably 
> there's more than just an IO supply?
Display regulators (AB/IBB/AMOLEDB, not to be confused with LAB/IBB)
on modern Qualcomm platforms are controlled by the secure firmware
layer (yes, you read that correctly). Some panels require additional
supplies, but this one just has one positive, one negative and one
I/O regulator.

Konrad
> 
> Rob