修改设备树，取消在i2s2中的定义
i2s2_pins_a: i2s2@0 {
/* I2S_PIN: MCLK, BCLK, LRCK */
pins = "PF3", "PF5"; //pf6 used as pa pow
function = "i2s2";
drive-strength = <20>;
bias-disable;
};
i2s2_pins_d: i2s2_sleep@0 {
pins = "PF0", "PF1", "PF3", "PF5"; //pf6 used as pa pow
function = "io_disabled";
drive-strength = <20>;
bias-disable;
};
不输出MCLK
soundcard-mach,mclk-fs = <0>;
增加PF6的设置
&i2s2_plat {
tdm-num = <2>;
tx-pin = <0>;
rx-pin = <0>;
pinctrl-used;
pinctrl-names= "default","sleep";
pinctrl-0 = <&i2s2_pins_a &i2s2_pins_b &i2s2_pins_c>;
pinctrl-1 = <&i2s2_pins_d>;
pa-pin-max = <1>;
// 0: level contrl; 1: pulse contrl; 0xFF: user contrl.
pa-cfg-mode-0 = <0>;
pa-pin-0 = <&pio PF 6 GPIO_ACTIVE_HIGH>;
pa-pin-level-0 = <1>;
pa-pin-msleep-0 = <100>; //
pa-pin-msleep1-0 = <100>;
tx-hub-en;
rx-sync-en;
//status = "disabled";
status = "okay";
};

出错了，没有随着声音的播放拉高
pin 166 (PF6): UNCLAIMED
PF6状态不对

但是增加部分放在&codec下面状态（GPIO）是对的，说明i2s下面驱动代码没有实现
但是依然播放时不会拉高引脚，
把下面这句写入设备树（&i2s2_mach下），直接不能开机
//soundcard-mach,pin-switches = "SPK";

但是放在(&codec)下，可以开机，但是播放依然不会拉高
求助论坛，谢谢大家