Hello Ivan,
We use a Abracon ASFL1-12.288MHZ-EC-T oscillator. Since we're driving six DSPs we buffered its output with a SN74LVC2G34DBVR. The BCLK method should work but as I haven't tried it, it would be better for someone who has done so to comment on implementation. One advantage of going with a packaged oscillator is that the sometimes frustrating task of getting a crystal to oscillate reliably has already been done for you.
Best regards,
Bob