你好！
我们的计划是am625SIP做为主设备来提供时钟控制TAS5760通过扬声器播放声音。我们现在以在AM625SIP的MCASP0_AFSX(D20)引脚上提供了一个12.288Mhz的时钟源（TAS5760也用此时钟源），但我不知道该如何在设备树中对其配置使其可以正常使用,请帮忙告诉我该如何配置？
附件中是我配置有关MCASP的设备树和电路框图。
/ {
clk_mcasp1_fixed: clk_mcasp1_fixed {
#clock-cells = <0>;
compatible = "fixed-clock";
//clock-frequency = <24576000>;
clock-frequency = <12288000>;
};
clk_mcasp1: clk_mcasp1 {
#clock-cells = <0>;
//compatible = "gpio-gate-clock";
clocks = <&clk_mcasp1_fixed>;
//enable-gpios = <&main_gpio1 12 GPIO_ACTIVE_LOW>;; // BeagleBone Black Clk enable on GPIO1_27
};
codec_audio: sound {
status = "okay";
compatible = "simple-audio-card";
simple-audio-card,name = "AM62x-SKEVM";
simple-audio-card,widgets =
//"Headphone", "Headphone Jack",
//"Line", "Line In",
//"Microphone", "Microphone Jack";
"Speaker", "External Speaker";
simple-audio-card,routing =
//"Headphone Jack", "HPLOUT",
//"Headphone Jack", "HPROUT",
//"LINE1L", "Line In",
//"LINE1R", "Line In",
//"MIC3R", "Microphone Jack",
//"Microphone Jack", "Mic Bias";
"External Speaker", "OUT";
simple-audio-card,format = "i2s";
//simple-audio-card,format = "dsp_b";
//simple-audio-card,bitclock-master = <&sound_master>;
//simple-audio-card,frame-master = <&sound_master>;
simple-audio-card,bitclock-master = <&sound_master0>;
simple-audio-card,frame-master = <&sound_master0>;
//simple-audio-card,bitclock-inversion;
//simple-audio-card,hp-det-gpio //连接耳机时发出信号的GPIO参考,用来检测耳机插入的GPIO配置。
//simple-audio-card,mic-det-gpio //连接麦克风时触发的GPIO，用来检测GPIO连接。
//simple-audio-card,mclk-fs = <62>;
//simple-audio-card,mclk-fs = <256>;
//simple-audio-card,mclk-fs = <512>;
//simple-audio-card,mclk-fs = <2182>;
//simple-audio-card,bit-clock-freq = <48000000>;
//simple-audio-card,sampling-rate = <48000>;
//simple-audio-card,bits-per-sample = <32>;
//simple-audio-card,channels = <2>;
//simple-audio-card,bit-clock-freq = <12288000>;
//simple-audio-card,sampling-rate = <12288>;
//simple-audio-card,bits-per-sample = <32>;
//simple-audio-card,channels = <2>;
sound_master0: simple-audio-card,cpu {
//#sound-dai-cells = <0>;
sound-dai = <&mcasp1>;
clocks = <&clk_mcasp1>;
//bitclock-master = <3072000>;
//frame-master = <48000>;
//system-clock-frequency = <12288000>;
//mclk-fs = <256>;
//system-clock-frequency = <24000000>;
//system-clock-frequency = <3072000>;
//system-clock-frequency = <48000>;
system-clock-direction-out;
};
sound_master1: simple-audio-card,codec {
sound-dai = <&tas5720>;
//clocks = <&tas5760_mclk>;
};
};
}
&main_pmx0 {
main_mcasp1_pins_default: main-mcasp1-pins-default {
pinctrl-single,pins = <
//音频时钟输入
//AM62X_IOPAD(0x1A8, PIN_INPUT, 2) /* (D20) MCASP0_AFSX.AUDIO_EXT_REFCLK1 */
//MCASP发送位时钟
//AM62X_IOPAD(0x090, PIN_INPUT, 2) /* (M24) GPMC0_BE0N_CLE.MCASP1_ACLKX */
AM62X_IOPAD(0x090, PIN_OUTPUT, 2) /* (M24) GPMC0_BE0N_CLE.MCASP1_ACLKX */
//MCASP发送帧同步信号或左右声道时钟
//AM62X_IOPAD(0x098, PIN_INPUT, 2) /* (U23) GPMC0_WAIT0.MCASP1_AFSX */
AM62X_IOPAD(0x098, PIN_OUTPUT, 2) /* (U23) GPMC0_WAIT0.MCASP1_AFSX */
//MCASP串行输入输出接口
//AM62X_IOPAD(0x08c, PIN_OUTPUT, 2) /* (L25) GPMC0_WEN.MCASP1_AXR0 */
//AM62X_IOPAD(0x088, PIN_OUTPUT, 2) /* (L24) GPMC0_OEN.MCASP1_AXR1 */
//AM62X_IOPAD(0x084, PIN_OUTPUT, 2) /* (L23) GPMC0_ADVN_ALE.MCASP1_AXR2 */
AM62X_IOPAD(0x07c, PIN_OUTPUT, 2) /* (P25) GPMC0_CKL.MCASP1_AXR3 */
>;
};
}
&mcasp1 {
status = "okay";
#sound-dai-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&main_mcasp1_pins_default>;
op-mode = <0>; /* MCASP_IIS_MODE */
//op-mode = <1>; /* MCASP_DIT_MODE */
//tdm-slots = <2>;
tdm-slots = <2>;
//auxclk-fs-ratio = <2177>;
/*
serial-dir = < // 0: INACTIVE, 1: TX, 2: RX
1 1 1 1
0 0 0 0
0 0 0 0
0 0 0 0
>;
*/
serial-dir = < // 0: INACTIVE, 1: TX, 2: RX
0 0 0 1
0 0 0 0
0 0 0 0
0 0 0 0
>;
tx-num-evt = <0>;
rx-num-evt = <0>;
};
&main_i2c1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&main_i2c1_pins_default>;
clock-frequency = <100000>;
tas5720:tas5720@6c {
#sound-dai-cells = <0>;
compatible = "ti,tas5720";
reg = <0x6c>;
dvdd-supply = <&vcc_3v3_sys>;
pvdd-supply = <&vcc_3v3_sys>;
//sleep = <&exp1 15 GPIO_ACTIVE_LOW>;
//shutdown = <&main_gpio0 41 GPIO_ACTIVE_HIGH>;
status = "okay";
};
}