arm64: dts: rockchip: rk3528-evb: prepare bt sco settings

we don't directly add bt-sco cards because it may take some
i2s/pcm, which may use dma, but dmas may limit.
so we just prepare this settings, then if any one who want to
support bt-sco, he/she can just add dts in board-level dtsi.

For example diff in "rk3528-evb1-ddr4-v10.dtsi":

+&bt_sco {
+       status = "okay";
+};
+
+&bt_sound {
+       status = "okay";
+};
+
+&sai0{
+       status = "okay";
+};

The default pcm/i2s setting is:
Format: PCM, dsp_a, MSB first, short sync, rising edge and 1 bclk.
rockchip soc: master; Bt controller: slave

Change-Id: I64e76c2ae4b8449e2ee345587e080b3a70521ed9
Signed-off-by: Zou Dengming <marsow.zou@rock-chips.com>

arch/arm64/boot/dts/rockchip/rk3528-demo.dtsi

@@ -40,6 +40,27 @@
 		};
 	};
 
+	bt_sco: bt-sco {
+		status = "disabled";
+		compatible = "delta,dfbmcs320";
+		#sound-dai-cells = <0>;
+	};
+
+	bt_sound: bt-sound {
+		status = "disabled";
+		compatible = "simple-audio-card";
+		simple-audio-card,format = "dsp_a";
+		simple-audio-card,bitclock-inversion = <0>;
+		simple-audio-card,mclk-fs = <256>;
+		simple-audio-card,name = "rockchip,bt";
+		simple-audio-card,cpu {
+			sound-dai = <&sai0>;
+		};
+		simple-audio-card,codec {
+			sound-dai = <&bt_sco>;
+		};
+	};
+
 	dc_12v: dc-12v {
 		compatible = "regulator-fixed";
 		regulator-name = "dc_12v";
@@ -369,6 +390,11 @@
 	>;
 };
 
+&sai0 {
+	pinctrl-0 = <&i2s0m0_lrck &i2s0m0_sclk &i2s0m0_sdi &i2s0m0_sdo>;
+	status = "disabled";
+};
+
 &sai2 {
 	status = "okay";
 };

arch/arm64/boot/dts/rockchip/rk3528-evb.dtsi

@@ -39,6 +39,27 @@
 		};
 	};
 
+	bt_sco: bt-sco {
+		status = "disabled";
+		compatible = "delta,dfbmcs320";
+		#sound-dai-cells = <0>;
+	};
+
+	bt_sound: bt-sound {
+		status = "disabled";
+		compatible = "simple-audio-card";
+		simple-audio-card,format = "dsp_a";
+		simple-audio-card,bitclock-inversion = <0>;
+		simple-audio-card,mclk-fs = <256>;
+		simple-audio-card,name = "rockchip,bt";
+		simple-audio-card,cpu {
+			sound-dai = <&sai0>;
+		};
+		simple-audio-card,codec {
+			sound-dai = <&bt_sco>;
+		};
+	};
+
 	dc_12v: dc-12v {
 		compatible = "regulator-fixed";
 		regulator-name = "dc_12v";
@@ -530,6 +551,11 @@
 	>;
 };
 
+&sai0 {
+	pinctrl-0 = <&i2s0m1_lrck &i2s0m1_sclk &i2s0m1_sdi &i2s0m1_sdo>;
+	status = "disabled";
+};
+
 &sai2 {
 	status = "okay";
 };

arch/arm64/boot/dts/rockchip/rk3528-evb3-lp4x-v10.dtsi

@@ -85,6 +85,11 @@
 	status = "okay";
 };
 
+&sai0 {
+	pinctrl-0 = <&i2s0m0_lrck &i2s0m0_sclk &i2s0m0_sdi &i2s0m0_sdo>;
+	status = "disabled";
+};
+
 &uart2 {
 	status = "okay";
 	pinctrl-names = "default";