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cmn_refclk_<p/m> lines in Torrent SERDES are used for an connecting external reference clock. cmn_refclk_<p/m> can also be configured to output the reference clock. In order to drive the refclk out from the SERDES (Cadence Torrent), PHY_EN_REFCLK should be set in SERDES_RST of WIZ. Model PHY_EN_REFCLK as a clock, so that platforms like AM642 EVM can enable it. Based on: https://lore.kernel.org/r/20210310120840.16447-6-kishon@ti.com Signed-off-by: George McCollister <george.mccollister@konsulko.com> Tested-by: Bryan Brattlof <bb@ti.com>