[RK3288][Android6.0] 移植笔记 --- RT5640 Audio Codec添加

Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

之前平台用的RT5631, 由于此IC将要停产,所以需要替换为RT5640.

RT5640和RT3224在硬件和软件上完全兼容, 而RK配置RT3224时用是RT3261的驱动,有点绕.

以下是添加步骤:
1. 开启对应宏
kernel/arch/arm/configs/rockchip_defconfig:

CONFIG_SND_RK_SOC_RT3224=y

这样, rt3261.c和rk_rt3261就会被编译进去.

2.dts中添加配置
kernel/arch/arm/boot/dts/rk3288-eco.dts
Codec device添加:
device name是 “rockchip-rt3261”.

+       rockchip-rt3224 {
+               compatible = "rockchip-rt3261";
+               dais {
+                       dai0 {
+                               audio-codec = <&rt3261>;
+                               audio-controller = <&i2s>;
+                               format = "i2s";
+                               //continuous-clock;
+                               //bitclock-inversion;
+                               //frame-inversion;
+                               //bitclock-master;
+                               //frame-master;
+                       };
+                       dai1 {
+                               audio-codec = <&rt3261>;
+                               audio-controller = <&i2s>;
+                               format = "dsp_a";
+                               //continuous-clock;
+                               bitclock-inversion;
+                               //frame-inversion;
+                               //bitclock-master;
+                               //frame-master;
+                       };
+               };
+       };

这样rk_rt3261.c的driver就会匹配上,最终注册Machine driver.

I2C设备添加:
地址是0x1C, device name是”rt3261”.

&i2c2 {
......
+    rt3261: rt3261@1c {
+               compatible = "rt3261";
+               reg = <0x1c>;
+       //      codec-en-gpio = <0>;//sdk default high level
+               spk-num= <2>;
+               modem-input-mode = <1>;
+               lout-to-modem_mode = <1>;
+               spk-amplify = <2>;
+               playback-if1-data_control = <0>;
+               playback-if2-data_control = <0>;
+                status = "okay";
+       };
 };

这样rt3261.c中的i2c driver就会匹配上,最终注册Codec driver.