&i2c2 {
es8323: es8323@10 {
			compatible = "es8323";
			reg = <0x10>;
			spk-con-gpio = <&gpio7 GPIO_B7 GPIO_ACTIVE_HIGH>;
			hp-con-gpio = <&gpio0 GPIO_B5 GPIO_ACTIVE_HIGH>;
			hp-det-gpio = <&gpio7 GPIO_A4 GPIO_ACTIVE_HIGH>;
			hub_rest = <&gpio0 GPIO_B6 GPIO_ACTIVE_LOW>;
			hub_en = <&gpio7 GPIO_B2 GPIO_ACTIVE_HIGH>;
		};
};

rk_es8323.c rockchip平台machine驱动

DeviceTree Describe

/ {
	rockchip-es8323 {
		compatible = "rockchip-es8323";
		dais {
			dai0 {
				audio-codec = <&es8323>;
				audio-controller = <&i2s>;
				format = "i2s";
			};
		};
	};
};

rk_i2s.c rockchip平台platform驱动

DeviceTree Describe

i2s: rockchip-i2s@0xff890000 {
		 compatible = "rockchip-i2s";
		 reg = <0xff890000 0x10000>;
		 i2s-id = <0>;
		 clocks = <&clk_i2s>, <&clk_i2s_out>, <&clk_gates10 8>;
		 clock-names = "i2s_clk","i2s_mclk", "i2s_hclk";
		 interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
		 dmas = <&pdma0 0>, <&pdma0 1>;
		 dma-names = "tx", "rx";
		 pinctrl-names = "default", "sleep";
		 pinctrl-0 = <&i2s_mclk &i2s_sclk &i2s_lrckrx &i2s_lrcktx &i2s_sdi &i2s_sdo0 &i2s_sdo1 &i2s_sdo2 &i2s_sdo3>;
		 pinctrl-1 = <&i2s_gpio>;
	 };

从datasheet里Address Mapping可以找到I2S控制器被映射到的位置

中断号(SPI[85])

DMA编号(tx[0], rx[1])

I2S寄存器信息,32bit,步进4

Debug

编译后得到连个模块es8323.ko, rk_es8323.ko, rk_i2s.ko

加载codec驱动

insmod es8323.ko

cat /sys/kernel/debug/asoc/codecs

内容如下(i2c_driver name.i2c控制器号-I2C设备地址)
ES8323 codec.2-0010

cat /sys/kernel/debug/asoc/dais
ES8323 HiFi

加载platform驱动

insmod rk_i2s.ko
cat /sys/kernel/debug/asoc/dais
内容如下(i2s控制器号地址.dainame)
ff890000.rockchip-i2s

cat /sys/kernel/debug/asoc/platforms
内容如下(i2s控制器号地址.dainame)
ff890000.rockchip-i2s

加载machine驱动

insmod rk_es8323.ko 有如下信息表示成功,练接连个dai
ES8323 HiFi <-> ff890000.rockchip-i2s mapping ok

codec probe成功后在下面目录会有相关信息

/dev/snd/
/proc/asound/cards
/sys/kernel/debug/asoc/
/sys/class/sound/

Usage

将es8323.dtsi包含到主dts中

#include "es8323.dtsi"

test

录音

tinycap test.wav

播放

tinyplay test.wav