[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.