Linux/tlv320aic3104: How to configure to make output on HPROUT/HPLOUT?

Tool/software: Linux

Hi, I'm new to codec and got a problem. 

I am using Beaglebone black,tlv320aic3104 on custom cape.

I used MCLK, BCLK, WCLK, DIN pin to make sound .

( I am using sdk, am335x-evm-03.03.00.05) 

I enabled oscillator on beaglebone black(I used GPIO1_27 to enable it) to make 24.576 MHz clock to MCLK.

I used device tree file to configure hardware.

To test it, I used speaker-test command.

and I could see MCLK(3), BLCK(4), WCLK(2), DIN(1) output. see below picture.

But, I could not hear anything from speaker attached to HPLOUT/HPROUT. 

so below is HPLOUT/HPROUT. 

Only thing I could see is little increase in voltage (when I used 'speaker-test' command) 

I'm waiting for advise.

Thanks.