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- Support time stamp sync with networking master timer.
- Support ipg 40MHz clock, and precision is about 20ns.
- Don't support ipg 66MHz clock.
- Test flow:
1. Enable CONFIG_FEC_1588 in imx6_defconfig file.
2. Select pll3 for ipg clk 40M in uboot plugin code.
I. set reg 0x20c8028 value to 0x10000;
II.set reg 0x20c8024 value to 0x3040;
III. set reg 0x20c4014[25] to 0x1
IV. set reg 0x20c4014[12:10] to 0x5
3. Rebuid uboot and setup the ethernet environment.
4. Run the 1588 stack ptp_main in master and slave.
Signed-off-by: Fugang Duan <B38611@freescale.com>
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