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phy: cadence-torrent: Add support to drive refclk out
cmn_refclk_<p/m> lines in Torrent SERDES is used for connecting external reference clock. cmn_refclk_<p/m> can also be configured to output the reference clock. Model this derived reference clock as a "clock" so that platforms like AM642 EVM can enable it. This is used by PCIe to use the same refclk both in local SERDES and remote device. Add support here to drive refclk out. Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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