The Radxa Rock 5 ITX board exposes an HDMI input exactly the same way as
the Rock 5B, but this was not reflected in its DTS.

Change the rk3588-rock-5-itx to configure and enable the hdmi_receiver
and hdmi_receiver_cma nodes.

The hot-plug detection (HPD) pin keeps the hdmirx_det name rather than
the hdmirx_hpd name used in other boards since that is what matches the
official schematics (HDMIIRX_DET_L).

The configurations were confirmed to be identical on the downstream
Radxa kernel, and this has been tested to work on a Rock 5 ITX board
running kernel 6.19.3.

Signed-off-by: Pedro Alves <redacted>
---
Tested with the following commands:

v4l2-ctl --verbose -d /dev/video4 \
  --set-fmt-video=width=3840,height=2160,pixelformat='BGR3' \
  --stream-mmap=4 --stream-skip=3 --stream-count=20 \
  --stream-to=hdmiin.raw --stream-poll

ffmpeg -f rawvideo -vcodec rawvideo -s 3840x2160 -r 30 -pix_fmt bgr24 \
  -i hdmiin.raw output.mp4
---
Changes in v2:
- Updated dts spacing to match coding style
- Reverted pin naming to hdmirx_det to match schematics
  - Didn't end up changing other boards to match. There are quite a few
    others, so I'll probably send a separate patch for that.

- Link to v1: https://lore.kernel.org/r/20260304-radxa-r5-itx-hdmirx-v1-1-f77bf1f7ce03@pta2002.com (local)
---
 arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
index 172aeabba72a..8e0eead7d223 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts

@@ -349,6 +349,18 @@ &hdmi1_sound {
 	status = "okay";
 };
 
+&hdmi_receiver_cma {
+	status = "okay";
+};
+
+&hdmi_receiver {
+	pinctrl-0 = <&hdmim1_rx_cec &hdmim1_rx_hpdin &hdmim1_rx_scl &hdmim1_rx_sda &hdmirx_det>;
+	pinctrl-names = "default";
+	hpd-gpios = <&gpio1 RK_PC6 GPIO_ACTIVE_LOW>;
+
+	status = "okay";
+};
+
 &hdptxphy1 {
 	status = "okay";
 };

---
base-commit: 05f7e89ab9731565d8a62e3b5d1ec206485eeb0b
change-id: 20260303-radxa-r5-itx-hdmirx-f4645e64f8c3

Best regards,
-- 
Pedro Alves [off-list ref]