From: Laxman Dewangan <ldewangan@nvidia.com>
To: <broonie@kernel.org>, <robh+dt@kernel.org>
Cc: <mark.rutland@arm.com>, <linux-kernel@vger.kernel.org>,
<devicetree@vger.kernel.org>,
Laxman Dewangan <ldewangan@nvidia.com>,
Douglas Anderson <dianders@chromium.org>,
Aleksandr Frid <afrid@nvidia.com>
Subject: [PATCH V2 1/2] regulator: pwm: DT: Add ramp delay for exponential voltage transition
Date: Fri, 18 Nov 2016 20:05:55 +0530 [thread overview]
Message-ID: <1479479756-10755-1-git-send-email-ldewangan@nvidia.com> (raw)
Some PWM regulator has the exponential transition in voltage change as
opposite to fixed slew-rate linear transition on other regulators.
For such PWM regulators, add the property to tell that voltage change
is exponential and having fixed delay for any level of change.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
CC: Douglas Anderson <dianders@chromium.org>
CC: Aleksandr Frid <afrid@nvidia.com>
---
This patch is continuation of discussion on patch
regulator: pwm: Fix regulator ramp delay for continuous mode
https://patchwork.kernel.org/patch/9216857/
where is it discussed to have separate property for PWM which has
exponential voltage transition.
Changes from V1:
- Pass the flag to tell that voltage ramp is exponential instead of
providing delay.
---
.../devicetree/bindings/regulator/pwm-regulator.txt | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
index 3aeba9f..2d9ef3a 100644
--- a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
@@ -54,6 +54,18 @@ Optional properties:
--------------------
- enable-gpios: GPIO to use to enable/disable the regulator
+- voltage-ramp-exponential: Boolean, Some of PWM regulator has the exponential
+ transition in voltage ramp as opposite to fixed
+ slew-rate linear transition on other regulators.
+ For such PWM regulator, presence of this property will
+ tell that value of the regulator ramp delay provided by
+ DT property "regulator-ramp-delay" is exponential and
+ fixed delay for any voltage level change.
+ If PWM regulator supports the fixed linear slew rate
+ then this property should be absent from DT node and
+ property "regulator-ramp-delay" is used as linear slew
+ rate.
+
Any property defined as part of the core regulator binding can also be used.
(See: ../regulator/regulator.txt)
--
2.1.4
next reply other threads:[~2016-11-18 14:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-18 14:35 Laxman Dewangan [this message]
2016-11-18 14:35 ` [PATCH V2 2/2] regulator: pwm: Add ramp delay for exponential voltage transition Laxman Dewangan
2016-11-21 16:17 ` [PATCH V2 1/2] regulator: pwm: DT: " Rob Herring
2016-11-22 8:50 ` Laxman Dewangan
2016-11-22 21:13 ` Rob Herring
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