[PATCH v3 4/4] arm64: dts: rockchip: enable HDMI RX audio capture on Orange Pi 5 Plus

[Igor Paunovic]

Route the HDMI receiver audio to i2s7_8ch, the receive-only I2S
interface dedicated to HDMI RX, through a simple-audio-card with the
receiver as bitclock and frame master. Together with the audio
capture support in the snps_hdmirx driver this exposes a capture-only
ALSA card fed by the HDMI input.

Tested on the Orange Pi 5 Plus with multiple HDMI sources: capture
follows the source sample rate and stays in sync via the FIFO-level
clock tracking in the driver.

Signed-off-by: Igor Paunovic <royalnet026@xxxxxxxxx>
---
New in v3.

 .../dts/rockchip/rk3588-orangepi-5-plus.dts   | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-orangepi-5-plus.dts b/arch/arm64/boot/dts/rockchip/rk3588-orangepi-5-plus.dts
index 9950d11..d5840e1 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-orangepi-5-plus.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-orangepi-5-plus.dts
@@ -37,6 +37,22 @@
 		};
 	};
 
+	hdmiin-sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "rockchip,hdmiin";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,bitclock-master = <&hdmiin_codec>;
+		simple-audio-card,frame-master = <&hdmiin_codec>;
+
+		simple-audio-card,cpu {
+			sound-dai = <&i2s7_8ch>;
+		};
+
+		hdmiin_codec: simple-audio-card,codec {
+			sound-dai = <&hdmi_receiver 0>;
+		};
+	};
+
 	ir-receiver {
 		compatible = "gpio-ir-receiver";
 		gpios = <&gpio4 RK_PB3 GPIO_ACTIVE_LOW>;
@@ -247,6 +263,10 @@
 	status = "okay";
 };
 
+&i2s7_8ch {
+	status = "okay";
+};
+
 &led_blue_gpio {
 	gpios = <&gpio3 RK_PA6 GPIO_ACTIVE_HIGH>;
 	status = "okay";
-- 
2.53.0