linux-kernel - Re: [PATCH v5 5/6] regulator: core: Add support for a fixed delay after voltage changes

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Message-ID: <20160923151426.GA13456@rob-hp-laptop>
Date:   Fri, 23 Sep 2016 10:14:26 -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 v5 5/6] regulator: core: Add support for a fixed delay
 after voltage changes

On Wed, Sep 14, 2016 at 09:52:09AM -0700, Matthias Kaehlcke wrote:
> The target voltage is not 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 properties
> "regulator-settle-time-up-us"/"regulator-settle-time-down-us" which
> allow to specify a fixed delay after a voltage increase or decrease.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v5:
> - Added support for delay on voltage decreases
> - Don't skip set_voltage_time op if no settle time and ramp delay
> 
>  .../devicetree/bindings/regulator/regulator.txt        |  4 ++++

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

>  drivers/regulator/core.c                               | 18 +++++++++++-------
>  drivers/regulator/of_regulator.c                       |  8 ++++++++
>  include/linux/regulator/machine.h                      |  4 ++++
>  4 files changed, 27 insertions(+), 7 deletions(-)