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This adds a helper function for clk_get_by_name in cases where the clock is optional. Hopefully this helps point driver writers in the right direction. Also convert some existing users. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Simon Glass <sjg@chromium.org> Link: https://lore.kernel.org/r/20220115205247.566210-2-seanga2@gmail.com