Re: [PATCH 3/3] arch: arm64: dts: sm8650-hdk: add support for the Display Card overlay

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Hi Neil,

On 2/23/24 10:52, Neil Armstrong wrote:
With the SM8650-HDK, a Display Card kit can be connected to provide
a VTDR6130 display with Goodix Berlin Touch controller.

In order to route the DSI lanes to the connector for the Display
Card kit, a switch must be changed on the board.

The HDMI nodes are disabled since the DSI lanes are shared with
the DSI to HDMI transceiver.

Add support for this card as an overlay and apply it it at
build-time to the sm8650-hdk dtb.

Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>


+	mdp_vsync_active: mdp-vsync-active-state {
+		pins = "gpio86";
+		function = "mdp_vsync";
+		drive-strength = <2>;
+		bias-pull-down;
+	};
+	mdp_vsync_suspend: mdp-vsync-suspend-state {
+		pins = "gpio86";
+		function = "mdp_vsync";
+		drive-strength = <2>;
+		bias-pull-down;
+	};

If you have a single pin configuration for active and suspend states,
then likely you may have only one device tree node here.

Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@xxxxxxxxxx>

I don't add my Tested-by tag, since I don't get a panel working on 6.8.0-rc6,
while in runtime MSM and DSI are enabled, the panel driver is not initialized:

  panel-visionox-vtdr6130 ae94000.dsi.0: Failed to initialize panel: -22

Best wishes,

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