RK3399 -- i2s1 聲卡註冊配置

說明：本文適用於 RK3399 linux 4.4 內核系列SDK。硬件上，音頻外部 codec 芯片 i2s 引腳與 RK3399 i2s1連接。軟件上需要加下述patch（以 rt5640 爲例）：

DTS配置

/ {
	rt5640-sound {
		status = "okay";	
		compatible = "simple-audio-card";
		simple-audio-card,format = "i2s";
		simple-audio-card,name = "rockchip,rt5640-codec";
		simple-audio-card,mclk-fs = <256>;
		simple-audio-card,widgets =
			"Microphone", "Mic Jack",
			"Headphone", "Headphone Jack";
		simple-audio-card,routing =
			"Mic Jack", "MICBIAS1",
			"IN1P", "Mic Jack",
			"Headphone Jack", "HPOL",
			"Headphone Jack", "HPOR";	
		simple-audio-card,cpu {
		        sound-dai = <&i2s1>;
		};
		simple-audio-card,codec {
		        sound-dai = <&rt5640>;
		};
	};
};

&i2s1 {
    status = "okay";
    #sound-dai-cells = <0>;
    rockchip,i2s-broken-burst-len;
    rockchip,playback-channels = <2>;
    rockchip,capture-channels = <2>;
    assigned-clocks = <&cru SCLK_I2S_8CH>;
    assigned-clock-parents =<&cru SCLK_I2S1_8CH>;
};

&i2c1 {
	status = "okay";
    rt5640: rt5640@1c {
		#sound-dai-cells = <0>;
		compatible = "realtek,rt5640";
		reg = <0x1c>;
		clocks = <&cru SCLK_I2S_8CH_OUT>;
		clock-names = "mclk";
		realtek,in1-differential;
		realtek,in2-differential;
		pinctrl-names = "default";
		pinctrl-0 = <&i2s_8ch_mclk>;
		status = "okay";
	};
};

時鐘配置

diff --git a/drivers/clk/rockchip/clk-rk3399.c b/drivers/clk/rockchip/clk-rk3399.c
index f434454..f5822f0 100644
--- a/drivers/clk/rockchip/clk-rk3399.c
+++ b/drivers/clk/rockchip/clk-rk3399.c
@@ -712,7 +712,7 @@ static struct rockchip_clk_branch rk3399_clk_branches[] __initdata = {
 	GATE(SCLK_I2S2_8CH, "clk_i2s2", "clk_i2s2_mux", CLK_SET_RATE_PARENT,
 			RK3399_CLKGATE_CON(8), 11, GFLAGS),
 
-	MUX(0, "clk_i2sout_src", mux_i2sch_p, CLK_SET_RATE_PARENT,
+	MUX(SCLK_I2S_8CH, "clk_i2sout_src", mux_i2sch_p, CLK_SET_RATE_PARENT,
 			RK3399_CLKSEL_CON(31), 0, 2, MFLAGS),
 	COMPOSITE_NODIV(SCLK_I2S_8CH_OUT, "clk_i2sout", mux_i2sout_p, CLK_SET_RATE_PARENT,
 			RK3399_CLKSEL_CON(30), 8, 2, MFLAGS,
 			
diff --git a/include/dt-bindings/clock/rk3399-cru.h b/include/dt-bindings/clock/rk3399-cru.h
index d32ce01..710d610 100644
--- a/include/dt-bindings/clock/rk3399-cru.h
+++ b/include/dt-bindings/clock/rk3399-cru.h
@@ -226,6 +226,7 @@
 #define ACLK_GIC_PRE	 		262
 #define ACLK_VOP0_PRE	 		263
 #define ACLK_VOP1_PRE	 		264
+#define SCLK_I2S_8CH			265
 
 /* pclk gates */
 #define PCLK_PERIHP			320