Slave configuration for chan_alsa.c

Hi,

I have ep9302 arm9 linux kit .I want to interface ep9302 with a codec as slave.( ep9302
will be slave ). Codec has 8 khz lrclk , 2.048 mhz sclk.And it is working at dsp mode.
But ep9302 has i2s interface.The ep93xx-i2s.c interface is for master .
How can I configure chan_alsa.c for slave configuration.