Quoting Douglas Anderson (2021-03-04 15:51:59)
> The clock framework makes it simple to deal with an optional clock.
> You can call clk_get_optional() and if the clock isn't specified it'll
> just return NULL without complaint. It's valid to pass NULL to
> enable/disable/prepare/unprepare. Let's make use of this to simplify
> things a tiny bit.
> 
> NOTE: this makes things look a tad bit asymmetric now since we check
> for NULL before clk_prepare_enable() but not for
> clk_disable_unprepare(). This seemed OK to me. We already have to
> check for NULL in the enable case anyway so why not avoid the extra
> call?
> 
> Signed-off-by: Douglas Anderson <diand...@chromium.org>
> ---

Reviewed-by: Stephen Boyd <swb...@chromium.org>
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