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+0300 From: Laurentiu Palcu To: Krzysztof Kozlowski Cc: imx@lists.linux.dev, Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , dri-devel@lists.freedesktop.org, Alexander Stein , Dmitry Baryshkov , Ying Liu , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v21 3/8] dt-bindings: display: bridge: Add Cadence MHDP8501 Message-ID: References: <20260407-dcss-hdmi-upstreaming-v21-0-4681070ab82f@oss.nxp.com> <20260407-dcss-hdmi-upstreaming-v21-3-4681070ab82f@oss.nxp.com> <20260408-large-marigold-pheasant-bef65f@quoll> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260408-large-marigold-pheasant-bef65f@quoll> X-ClientProxiedBy: FR2P281CA0069.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:9a::10) To GV1PR04MB9135.eurprd04.prod.outlook.com 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR04MB9670 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Wed, Apr 08, 2026 at 08:42:09AM +0200, Krzysztof Kozlowski wrote: > On Tue, Apr 07, 2026 at 02:31:27PM +0000, Laurentiu Palcu wrote: > > From: Sandor Yu > > > > Add bindings for Cadence MHDP8501 DisplayPort/HDMI bridge. > > > > Signed-off-by: Sandor Yu > > Signed-off-by: Laurentiu Palcu > > --- > > .../bindings/display/bridge/cdns,mhdp8501.yaml | 131 +++++++++++++++++++++ > > 1 file changed, 131 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml > > new file mode 100644 > > index 0000000000000..77e16ee9d855d > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml > > @@ -0,0 +1,131 @@ > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/display/bridge/cdns,mhdp8501.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: Cadence MHDP8501 DP/HDMI bridge > > + > > +maintainers: > > + - Sandor Yu > > + > > +description: > > + Cadence MHDP8501 DisplayPort/HDMI interface. > > + > > +properties: > > + compatible: > > + enum: > > + - fsl,imx8mq-mhdp8501 > > + > > + reg: > > + maxItems: 1 > > + > > + clocks: > > + maxItems: 1 > > + description: MHDP8501 DP/HDMI APB clock. > > + > > + phys: > > + maxItems: 1 > > + description: > > + phandle to the DP/HDMI PHY > > + > > + interrupts: > > + items: > > + - description: Hotplug cable plugin. > > + - description: Hotplug cable plugout. > > + > > + interrupt-names: > > + items: > > + - const: plug_in > > + - const: plug_out > > + > > + cdns,bridge-type: > > Drop property. Graph defines what is connected on the other side. And if > this is for different devices then compatible tells what bridge is that. Initially, Sandor did use the remote compatible to decide the bridge type but he assumed the remote is always the connector. However, as Dmitry pointed out [1], this is not reliable as we can have another bridge in-between this one and the connector. [1] https://lore.kernel.org/all/dpj333mzr5azqhrgw3cxd7x5kiwxms4iomwy74uqfhr2zu4ocr@36rkth27d2jc/ -- Thanks, Laurentiu