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Without explicitly enabling sel_clk, clk_disable_unused() will disable it when boot is done, causing CPU hang on SPI1 register access on MT7986. Explicitly enable sel_clk to make SPI1 functional. Signed-off-by: Furong Xu <xfr@outlook.com> Signed-off-by: Chuanhong Guo <gch981213@gmail.com>