linux-kernel - Re: [PATCH v3 2/5] drm/bridge: simple: add Realtek RTD2171 DP-to-HDMI bridge

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Message-ID:
 <AM7P189MB100924E3244B953F0EA6D462E30CA@AM7P189MB1009.EURP189.PROD.OUTLOOK.COM>
Date: Mon, 8 Sep 2025 15:35:23 +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, dmitry.baryshkov@....qualcomm.com,
 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 v3 2/5] drm/bridge: simple: add Realtek RTD2171 DP-to-HDMI
 bridge

Hello Neil,

> Add support for the transparent Realtek RTD2171 DP-to-HDMI bridge.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/gpu/drm/bridge/simple-bridge.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c
> index 1f16d568bcc4e0fb56c763244389e6fecbcb2231..e4d0bc2200f8632bcc883102c89c270a17c68d0c 100644
> --- a/drivers/gpu/drm/bridge/simple-bridge.c
> +++ b/drivers/gpu/drm/bridge/simple-bridge.c
> @@ -266,6 +266,11 @@ static const struct of_device_id simple_bridge_match[] = {
>  		.data = &(const struct simple_bridge_info) {
>  			.connector_type = DRM_MODE_CONNECTOR_HDMIA,
>  		},
> +	}, {
> +		.compatible = "realtek,rtd2171",
> +		.data = &(const struct simple_bridge_info) {
> +			.connector_type = DRM_MODE_CONNECTOR_HDMIA,
> +		},
>  	}, {
>  		.compatible = "ti,opa362",
>  		.data = &(const struct simple_bridge_info) {
> 
> -- 
> 2.34.1

I would like to ask again if it may not be a better idea to introduce a 
fallback compatible, once this patchseries lands I will be adding the 
parade,ps185hdm. I don't know how many other variants there are that are 
just simple dp->hdmi bridges that don't require anything other than the 
connector type set to HDMIA. The Thinkbook 16 and zenbook a14 both have 
HDMI connectors, likely with simple bridges too.

Kind regards,
Maud