Messages in this thread | | | From | Peng Fan <> | Subject | RE: [PATCH] regmap: mmio: prepare/unprepare clk only when read/write | Date | Thu, 23 Apr 2020 10:51:36 +0000 |
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> Subject: Re: [PATCH] regmap: mmio: prepare/unprepare clk only when > read/write > > On Thu, Apr 23, 2020 at 01:46:31PM +0800, peng.fan@nxp.com wrote: > > From: Peng Fan <peng.fan@nxp.com> > > > > use clk_prepare at the very beginning will invoke pm runtime resume, > > if the clk is binded with a power domain. This will cause runtime > > power high. Let's use clk_prepare_enable and clk_disable_unprepare > > when read/write to avoid the runtime power issue. > > This will mean that we're doing clk_prepare() during I/O which isn't good > since for MMIO regmaps we support I/O operations in atomic contexts.
Ah, yes. Do you have any suggestions? If we use clk_prepare at the very beginning, the power that binded to the clk device will be always on, and cause power consumption high.
Thanks, Peng.
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