On Fri, Nov 04, 2022 at 02:18:00PM +0100, Maxime Ripard wrote: > So, the set_parent hook is effectively unused, possibly because of an > oversight. However, it could also be an explicit decision by the > original author to avoid any reparenting but through an explicit call to > clk_set_parent(). > The latter case would be equivalent to setting the flag > CLK_SET_RATE_NO_REPARENT, together with setting our determine_rate hook > to __clk_mux_determine_rate(). Indeed, if no determine_rate > implementation is provided, clk_round_rate() (through > clk_core_round_rate_nolock()) will call itself on the parent if > CLK_SET_RATE_PARENT is set, and will not change the clock rate > otherwise. __clk_mux_determine_rate() has the exact same behavior when > CLK_SET_RATE_NO_REPARENT is set. > And if it was an oversight, then we are at least explicit about our > behavior now and it can be further refined down the line. Given that the current approach involves patching every single user to set a default implementation it feels like it might be more straightforward to just have the clock API use that implementation if none is defined - as you say there's already a flag to indicate the unusual case where there's a solid reason to prevent reparenting. It feels like the resulting API is more straightforward.
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