[PATCH v3 2/2] arm64: dts: rockchip: add HDMI sound node for rk3328-rock64

[Katsuhiro Suzuki <katsuhiro@katsuster.net>]

This patch adds HDMI sound (I2S0) node for rock64.

After apply this patch, UART2 will fail to allocate DMA resources
but UART driver can work fine without DMA.

This error is related to the DMAC of rk3328 (pl330 or compatible).
DMAC connected to 16 DMA sources. Each sources have ID number that is
called 'Req number' in rk3328 TRM. Currently total 7 sources has been
activated as follows:

| Req number | Source | Required  |
|            |        | channels  |
|------------+--------+-----------|
| 14, 15     | I2S1   | 2ch       |
|  6,  7     | UART2  | 2ch       |
|     10     | SPDIF  | 1ch       |
|  8,  9     | SPI0   | 2ch       |
|------------+--------+-----------|
|            | Total  | 7ch       |

HDMI audio needs to activate new source I2S0 (Req number 11 and 12).
I2S0 can work concurrently with other sources, but rk3328 DMAC can
use max 8 channels at same time. If I2S0 is simply activated by this
patch, required DMAC channels will be 9. So last one (UART2) cannot
allocate the DMA resources.

Virt-dma mechanism for pl0330 DMAC driver is needed to fix this
problem.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
---
 .../arm64/boot/dts/rockchip/rk3328-rock64.dts | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts b/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
index 2157a528276b..bfc0930d245c 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
@@ -68,7 +68,8 @@
 	sound {
 		compatible = "audio-graph-card";
 		label = "rockchip,rk3328";
-		dais = <&i2s1_p0
+		dais = <&i2s0_p0
+			&i2s1_p0
 			&spdif_p0>;
 	};
 
@@ -141,6 +142,12 @@
 
 &hdmi {
 	status = "okay";
+
+	port@0 {
+		hdmi_p0_0: endpoint {
+			remote-endpoint = <&i2s0_p0_0>;
+		};
+	};
 };
 
 &hdmiphy {
@@ -256,6 +263,18 @@
 	};
 };
 
+&i2s0 {
+	status = "okay";
+
+	i2s0_p0: port {
+		i2s0_p0_0: endpoint {
+			dai-format = "i2s";
+			mclk-fs = <256>;
+			remote-endpoint = <&hdmi_p0_0>;
+		};
+	};
+};
+
 &i2s1 {
 	status = "okay";
 
-- 
2.20.1