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To enable the GMAC on the RK3368, we need to set up the clocking appropriately to generate a tx_clk for the MAC. This adds an implementation that implements the use of the <&ext_gmac> clock (i.e. an external 125MHz clock for RGMII provided by the PHY). This is the clock setup used by the boards currently supported by U-Boot (i.e. Geekbox, Sheep and RK3368-uQ7). This includes the change from commit - rockchip: clk: rk3368: define GMAC_MUX_SEL_EXTCLK Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>