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SubjectRe: [PATCH v2 11/14] regulator: s2mps11: Add opmode for S2MPS14 regulators
On Fri, 2014-02-14 at 21:05 +0000, Mark Brown wrote:
> On Fri, Feb 14, 2014 at 02:05:56PM +0100, Krzysztof Kozlowski wrote:
> > On Thu, 2014-02-13 at 17:46 +0530, Yadwinder Singh Brar wrote:
> > - low-power mode;
> > - low-power mode controlled by PWREN;
> > Although not all are present for each regulator.
> What exactly is low power mode and how does it interact with the enable?
> The name suggests it's a more efficient mode for use with low current
> drain, is that right?

Yes, it is (i.e. ground current on battery load typically reduced from
8mA to 1.5mA). In this mode for Buck5 and LDO-s the regulator is enabled
but output current is limited to 5 mA.

> > A generic solution for operating mode of regulators (not only s2mps11
> > and s5m8767) could cover all of these above or just a subset, for
> > example regulator bindings could look like:
> > - regulator-mode-suspend; /* PWR controls: on/off or low-power mode */
> > - regulator-mode-low-power; /* Low power mode */
> Those properties have awfully generic names and part of what I was
> wondering above is if the low power mode maps onto the idle or standby
> modes that the API defines? We don't cover those in the bindings yet
> since they are unfortunately fuzzy but perhaps we need to do so.

(depending on the understanding of "more efficient" and "most efficient"
for light loads). However the suspend mode of S5M8767/S2MPS14 is more
like automatic regulator disable by SoC.

Best regards,

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