linux-kernel - Re: [PATCH 01/11] dt-bindings: display: meson-dw-hdmi: Add compatible for S4 HDMI controller

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Message-ID: <8c3b9fa4-326e-4791-8154-07b268faa132@amlogic.com>
Date: Wed, 19 Nov 2025 10:57:21 +0800
From: Chuan Liu <chuan.liu@...ogic.com>
To: Piotr Oniszczuk <piotr.oniszczuk@...il.com>, ao.xu@...ogic.com
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
 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>, Kevin Hilman <khilman@...libre.com>,
 Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] dt-bindings: display: meson-dw-hdmi: Add compatible
 for S4 HDMI controller

Hi Piotr,

On 11/18/2025 10:50 PM, Piotr Oniszczuk wrote:
> [You don't often get email from piotr.oniszczuk@...il.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> [ EXTERNAL EMAIL ]
> 
> Ao,
> 
> Is there any chance to get this s4 drm hdmi series for current 6.18?
> 
> (i tried backport this series to 6.18 but have some issues with reparent vpu_0_sel to sysclk_b_sel)

Why do we need to reparent vpu_0_sel to sysclk_b_sel? is there any
background here?

The vpu_clk on S4 doesn't support sysclk_b_sel as one of its
selectable clock sources, so this reparent operation will definitely
fail. This has nothing to do with the kernel version.

> 
> 
> 
>> Wiadomość napisana przez Ao Xu via B4 Relay <devnull+ao.xu.amlogic.com@...nel.org> w dniu 10 sty 2025, o godz. 06:39:
>>
>> From: Ao Xu <ao.xu@...ogic.com>
>>
>> Add devicetree document for S4 HDMI controller
>>
>> Signed-off-by: Ao Xu <ao.xu@...ogic.com>
>> ---
>> Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>> index 84d68b8cfccc86fd87a6a0fd2b70af12e51eb8a4..6e0a8369eee915fab55af24d450a6c40e08def38 100644
>> --- a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>> +++ b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>> @@ -55,6 +55,7 @@ properties:
>>            - const: amlogic,meson-gx-dw-hdmi
>>        - enum:
>>            - amlogic,meson-g12a-dw-hdmi # G12A (S905X2, S905Y2, S905D2)
>> +          - amlogic,meson-s4-dw-hdmi # S4 (S905Y4)
>>
>>    reg:
>>      maxItems: 1
>>
>> --
>> 2.43.0
>>
>>
>>
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>> linux-amlogic@...ts.infradead.org
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> 
> 
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