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DM385 mcasp2_fck频率如何设置成24.576MHZ



dm385音频davinci-mcasp.1外接tlv320aic3x,想让dm385输出MCLK设置成24.576MHZ,默认mcasp.1用的是mcasp2_fck,频率继承关系:osc0_clkin_ck(20M) ---> sysclk22_ck(20M) --->  mcasp2_fck (20M)。

我尝试过:

clk_set_rate(dev->clk, 24576000);

但是设置完之后频率并没有改变。到底怎么设置呢?有经验的朋友都来说说吧!