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.