clk: dt: add support for default rate/parent
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Cover letter [PATCH 0/4] clk: dt: add support for default rate/parent
Quoting Tero Kristo (2014-03-05 05:10:17)
Quoted 3 lines
Ping.
Mike, any feedback on this?
Hi Tero,
Have you seen Sylwester's approach[1]? I prefer it since it is more device-oriented and less "centralized". The clock consumer enumerates the default parent or rate of a consumed clock. This can be made to work like your approach by having the clock driver consume these clocks and set them up with default rates or parents. What do you think?
Regards,
Mike
[1] https://lkml.org/lkml/2014/3/3/324
Quoted 36 lines
-Tero
Quoted 31 lines · Tero Kristo
Hi,
This set is a mix-match of new DT properties for generic and TI specific clock drivers. Basically provided for commenting purposes. The patches provide a way to configure clock parents / rates during boot through DT.
"default-rate" : sets rate of a clock during boot, supported for any DT
clock type (through generic clock driver)
"ti,default-parent" : selects a default parent for a multiplexer clock,
only supported for TI specific mux clock for now, as generic mux clock does not support DT clocksPatch #4 provided as a reference how to move the default rates / parents from kernel code to DT.
Default-rate logic in patch #2 looks somewhat complicated, as the clocks need to be sorted based on their parents to avoid cases where a child clock would set its rate first, just to be overridden by its parent changing rate later and resulting in incorrect rate for the child clock.
If the default-rate generic property is not going to fly, it can be moved to TI only drivers also.
-Tero
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