linux-kernel - Re: [PATCH v2 1/5] dt-bindings: display: bridge: simple: document the Realtek RTD2171 DP-to-HDMI bridge

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Message-ID:
 <AM7P189MB10091286D1F4DF0E43D42510E306A@AM7P189MB1009.EURP189.PROD.OUTLOOK.COM>
Date: Tue, 2 Sep 2025 11:51:40 +0200
From: Maud Spierings <maud_spierings@...mail.com>
To: neil.armstrong@...aro.org
Cc: Laurent.pinchart@...asonboard.com, airlied@...il.com,
 andersson@...nel.org, andrzej.hajda@...el.com, conor+dt@...nel.org,
 devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 jernej.skrabec@...il.com, jonas@...boo.se, kishon@...nel.org,
 konradybcio@...nel.org, krzk+dt@...nel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, rfoss@...nel.org,
 robh@...nel.org, simona@...ll.ch, tzimmermann@...e.de, vkoul@...nel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: display: bridge: simple: document the
 Realtek RTD2171 DP-to-HDMI bridge

Hello Neil,

> The Realtek RTD2171 chipset is a transparent DisplayPort 1.4 to
> HDMI 2.0 bridge.
> 
> This chipset is usually found in USB-C To HDMI Adapters and Docks,
> or laptops to provide HDMI display output.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  Documentation/devicetree/bindings/display/bridge/simple-bridge.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/simple-bridge.yaml b/Documentation/devicetree/bindings/display/bridge/simple-bridge.yaml
> index 43cf4df9811a5897843685727a49fd5a90096391..003a1c934f863864400d689cd784990cbc1de3de 100644
> --- a/Documentation/devicetree/bindings/display/bridge/simple-bridge.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/simple-bridge.yaml
> @@ -28,6 +28,7 @@ properties:
>        - enum:
>            - adi,adv7123
>            - dumb-vga-dac
> +          - realtek,rtd2171
>            - ti,opa362
>            - ti,ths8134
>            - ti,ths8135
> 
> -- 
> 2.34.1

I think this has to be rebased on the latest next since [1] got merged. 
I think we also need to consider maybe using a fallback compatible, 
because I think there is going to be a couple of simple DP->HDMI bridges 
on the mailing list.

Link: 
https://lore.kernel.org/all/20250822063959.692098-6-andyshrk@163.com/ [1]

Kind regards,
Maud