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Message-ID: <9e4733910810300939x40a7afear7a49557604ced628@mail.gmail.com> Date: Thu, 30 Oct 2008 12:39:42 -0400 From: "Jon Smirl" <jonsmirl@...il.com> To: "Jonas Bonn" <jonas.bonn@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [RFC] API for system clocks (oscillators) On Thu, Oct 30, 2008 at 12:27 PM, Jonas Bonn <jonas.bonn@...il.com> wrote: >> >> How does this compare to the framework in linux/include/linux/clk.h? >> > > clk.h is pretty much just an infrastructure for "storing" clock data > and accessors... it does not provide: > > i) Constraints on selectable frequencies of active devices > ii) Notifiers on frequency change, including changes due to events > such as reparenting > > These are the big ones that cause headaches. When I want to switch > frequency, I have to check elsewhere which devices are active and > which frequencies they allow. When a frequency changes, I have to > manually make sure that the active devices are notified properly of > the change. These are the main things that my document tries to > consolidate into one framework. Like I said, I'm not sure it's the > right approach, that's why I requested feedback... You could probably work those features into the existing clk framework. clk_set_rate() could compute the constrains and return an error. The API could be expanded with notifier support. -- Jon Smirl jonsmirl@...il.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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