linux-kernel - Re: [PATCH v4 3/4] regulator: Add support for a fixed delay after voltage increases

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Date:   Fri, 16 Sep 2016 07:28:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Mark Brown <broonie@...nel.org>, lgirdwood@...il.com,
        Douglas Anderson <dianders@...omium.org>,
        briannorris@...omium.org, javier@...hile0.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/4] regulator: Add support for a fixed delay after
 voltage increases

On Tue, Sep 06, 2016 at 12:05:04PM -0700, Matthias Kaehlcke wrote:
> The target voltage isn't necessarily reached inmediately after
> requesting a regulator to change the voltage. In some cases the
> ramp_delay can be used to calculate the stabilisation time, in others
> there is no direct relationship between the delta in the voltage and
> the stabilisation time. This change introduces the device tree property
> "regulator-settle-time-up-us" which allows to specify a fixed delay
> after a voltage increase.
> 
> We don't add an option of a fixed delay on the way down for now because
> the way down is probably modelled best with a ramp rate, not a fixed
> delay.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> 
> ---
> Changes in v4:
> - Moved from PWM regulator to regulator core
> - Added 'regulator' prefix to device tree property
> 
>  .../devicetree/bindings/regulator/regulator.txt    |  2 ++
>  drivers/regulator/core.c                           | 24 +++++++++++++---------
>  drivers/regulator/of_regulator.c                   |  4 ++++
>  include/linux/regulator/machine.h                  |  2 ++
>  4 files changed, 22 insertions(+), 10 deletions(-)

Acked-by: Rob Herring <robh@...nel.org>