arm64: dts: rockchip: add SPDIF node for ROCK Pi 4

Add a SPDIF audio-graph-card to ROCK Pi 4 device tree.

It's not enabled by default since all dma channels are used by
the (already) enabled i2s0/1/2 and the pin is muxed with GPIO4_C5
which might be in use already.
If enabled SPDIF_TX will be available at pin #15.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20210618181256.27992-6-knaerzche@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
index b49072af4014ba4272cc817cff3333eb75a74e35..98136c88fa49792e8bff5f6de2dcc147a454b3a8 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
@@ -42,6 +42,23 @@
                dais = <&i2s0_p0>;
        };
 
+       sound-dit {
+               compatible = "audio-graph-card";
+               label = "SPDIF";
+               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: dc-12v {
                compatible = "regulator-fixed";
                regulator-name = "vcc12v_dcin";
@@ -631,6 +648,15 @@
        status = "okay";
 };
 
+&spdif {
+
+       spdif_p0: port {
+               spdif_p0_0: endpoint {
+                       remote-endpoint = <&dit_p0_0>;
+               };
+       };
+};
+
 &tcphy0 {
        status = "okay";
 };