Re: [PATCH] clk: mediatek: Export CPU mux clocks for CPU frequency control

From: Viresh Kumar
Date: Thu Mar 12 2015 - 05:21:39 EST

On 11 March 2015 at 05:43, Mike Turquette <mturquette@xxxxxxxxxx> wrote:
> Sorry, I am not who you asked for advice but I will chime in anyways ;-)

Always welcome :)

> I really hate this intermediate frequency stuff in cpufreq. As we

I am starting to :)

> Furthermore any intermediate-frequency property in a Devicetree binding
> would suffer the same fate. Trying to neatly encode some weird sequence
> into this generic thing will get very ugly very fast.


> For proof please look at clk-divider.c, clk-gate.c, clk-mux.c or
> clk-composite.c and you'll see the result of the slow accumulation of
> lots and lots of hardware corner cases onto generic code. If I had known
> then what I know now I would not have created those generic clock types
> and I would have tried for an abstraction layer between generic stuff
> (e.g. find the best divider) and the real hardware stuff (write to the
> register). Instead I kept all of it together and now things are super
> ugly.

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