On 21/05/15 06:06, Paul Walmsley wrote: >> Enable falls under the "critical clocks" discussion that is ongoing. I >> assume that this is some sort of critical clock that can't be turned off? > > It only needs to be enabled for this particular display IP subsystem to > function: > > http://marc.info/?l=linux-omap&m=142071550111482&w=2 > > I believe Tomi is taking this approach (enabling it unconditionally) to > avoid adding support for a secondary IP block "main clock" to the hwmod Right. I don't think that would be a simple task (correct me if I'm wrong), and that would all be only for this one IP on this particular SoC type. > code. Apparently, the chips that contain this clock gating bit are not > intended to be used for power-critical use cases, so there's not much > motivation to switch it on and off with the display controller. Even in power-critical use cases the the power use difference should be negligible. Tomi
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