Much like the Sige5, the ROCK 4D also has an HDMI port, so is capable of
providing HDMI audio output as well.

Enable the SoC's hdmi_sound card, and also enable the SoC audio
controller (sai6) that feeds into it.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
---
 arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
index 4d4b8ababd2436b82515443b029916b3c786dba1..70bc6f909ec0843607c2705ee9f73b0ba521a977 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts

@@ -322,6 +322,10 @@ hdmi_out_con: endpoint {
 	};
 };
 
+&hdmi_sound {
+	status = "okay";
+};
+
 &hdptxphy {
 	status = "okay";
 };

@@ -772,6 +776,10 @@ &sai1m0_sdi0
 	status = "okay";
 };
 
+&sai6 {
+	status = "okay";
+};
+
 &saradc {
 	vref-supply = <&vcca1v8_pldo2_s0>;
 	status = "okay";

-- 
2.50.0