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When the driver tries to get optional clock, it ignores all errors except -EPROBE_DEFER, but if only ignores -ENOENT, it will cover some real errors, such as -ENOMEM, so use devm_clk_get_optional() to get optional clock. Cc: Peter Chen <Peter.Chen@nxp.com> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Acked-by: Peter Chen <Peter.Chen@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>