AW_I2S_SAMPLE_RATE
static struct pcmchan_caps aw_i2s_caps = {AW_I2S_SAMPLE_RATE, AW_I2S_SAMPLE_RATE, sc_fmt, 0};
const u_int bclk_div = bclk_prate / (2 * 32 * AW_I2S_SAMPLE_RATE);