PCM CODEC support on MT7628 LEDE 17.01.2

Hi,

We are trying to enable PCM( only) supported CODEC on MT7628 from LEDE 17.01.2 . We modified the DTS file by enabling the CPU DAI as master and CODEC DAI as slave and configuring the I2S pins as PCM interface mode.

i2s {
                                ralink,group = "i2s";
                                ralink,function = "pcm";
                        };

From kernel we enabled, RALINK_I2S, RALINK_DMA , SOUND_SOC flags. Some how we are not able to see the PCM clocks over the pins..

Please let us know.. we need any special configuration for PCM and any PCM driver required apart from ralink-i2s.c

Thanks,
Sai