[PATCH] arm64: dts: rockchip: add SPDIF node for rk3399-rockpro64

[Katsuhiro Suzuki]

This patch adds 'disabled' SPDIF sound node and related settings
for rk3399-rockpro64.

There are 2 reasons:
  - All RK3399 dma-bus channels have been already used by I2S0/1/2
  - RockPro64 does not have SPDIF optical nor coaxial connector,
    just have 3pins

Signed-off-by: Katsuhiro Suzuki <katsuh...@katsuster.net>
---
 .../boot/dts/rockchip/rk3399-rockpro64.dtsi   | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi 
b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
index 6e553ff47534..e35b30f8a46e 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
@@ -76,6 +76,23 @@ sound {
                dais = <&i2s1_p0>;
        };
 
+       sound-dit {
+               compatible = "audio-graph-card";
+               label = "rockchip,rk3399";
+               dais = <&spdif_p0>;
+       };
+
+       spdif-dit {
+               compatible = "linux,spdif-dit";
+               #sound-dai-cells = <0>;
+
+               port {
+                       dit_p0_0: endpoint {
+                               remote-endpoint = <&spdif_p0_0>;
+                       };
+               };
+       };
+
        vcc12v_dcin: vcc12v-dcin {
                compatible = "regulator-fixed";
                regulator-name = "vcc12v_dcin";
@@ -698,6 +715,17 @@ &sdhci {
        status = "okay";
 };
 
+&spdif {
+       pinctrl-0 = <&spdif_bus_1>;
+       status = "disabled";
+
+       spdif_p0: port {
+               spdif_p0_0: endpoint {
+                       remote-endpoint = <&dit_p0_0>;
+               };
+       };
+};
+
 &spi1 {
        status = "okay";
 
-- 
2.27.0