dt-bindings: net: tja11xx: add nxp,refclk_in property
TJA110x REF_CLK can be configured as interface reference clock intput or output when the RMII mode enabled. This patch add the property to make the REF_CLK can be configurable. Signed-off-by: Wei Fang <wei.fang@nxp.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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