From: Claudiu Beznea <claudiu.beznea@microchip.com>
To: thierry.reding@gmail.com, robh+dt@kernel.org,
mark.rutland@arm.com, linux@armlinux.org.uk, daniel@zonque.org,
haojian.zhuang@gmail.com, robert.jarzmik@free.fr, corbet@lwn.net,
nicolas.ferre@microchip.com,
alexandre.belloni@free-electrons.com
Cc: linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-amlogic@lists.infradead.org,
linux-rockchip@lists.infradead.org,
linux-rpi-kernel@lists.infradead.org, devicetree@vger.kernel.org,
Claudiu Beznea <claudiu.beznea@microchip.com>
Subject: [PATCH v2 15/16] pwm: add documentation for pwm push-pull mode
Date: Fri, 12 Jan 2018 16:23:02 +0200 [thread overview]
Message-ID: <1515766983-15151-16-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1515766983-15151-1-git-send-email-claudiu.beznea@microchip.com>
Add documentation for PWM push-pull mode.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
Documentation/devicetree/bindings/pwm/pwm.txt | 8 +++++++-
Documentation/pwm.txt | 18 ++++++++++++++++++
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/pwm/pwm.txt b/Documentation/devicetree/bindings/pwm/pwm.txt
index fdff25bad1db..a4562af3577c 100644
--- a/Documentation/devicetree/bindings/pwm/pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/pwm.txt
@@ -58,15 +58,21 @@ Example with optional PWM specifier for inverse polarity
- PWM_MODE_NORMAL: for all PWM controllers
- PWM_MODE_COMPLEMENTARY: for PWM controllers with more than one output per
PWM channel
+- PWM_MODE_PUSH_PULL: for PWM controllers with more than one output per channel,
+in push-pull mode
Example with PWM modes:
bl: blacklight {
pwms = <&pwm 0 5000000 PWM_POLARITY_INVERTED
- PWM_DTMODE_NORMAL | PWM_DTMODE_COMPLEMENTARY>;
+ PWM_DTMODE_NORMAL | PWM_DTMODE_COMPLEMENTARY |
+ PWM_DTMODE_PUSH_PULL>;
pwm-names = "backlight";
};
+If all the available modes are given as argument of pwms binding only the first
+valid one will be considered (first valid LSB bit of mode field).
+
2) PWM controller nodes
-----------------------
diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
index 58c9bd55f021..71b538239519 100644
--- a/Documentation/pwm.txt
+++ b/Documentation/pwm.txt
@@ -135,6 +135,24 @@ channel that was exported. The following properties will then be available:
Where T is the signal period.
+ Push-pull mode - for PWM chips with mode than one output per PWM channel;
+ output waveform for a PWM controller with 2 outputs per PWM channel, in
+ push-pull mode, with normal polarity looks like this:
+ __ __
+ PWMH __| |________| |________
+ __ __
+ PWML ________| |________| |__
+ <--T-->
+
+ If polarity is inversed:
+ __ ________ ________
+ PWMH |__| |__|
+ ________ ________ __
+ PWML |__| |__|
+ <--T-->
+
+ Where T is the signal period.
+
Implementing a PWM driver
-------------------------
--
2.7.4
next prev parent reply other threads:[~2018-01-12 14:23 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-12 14:22 [PATCH v2 00/16] extend PWM framework to support PWM modes Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 01/16] drivers: pwm: core: use a single of xlate function Claudiu Beznea
[not found] ` <1515766983-15151-2-git-send-email-claudiu.beznea-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
2018-01-12 18:35 ` Brian Norris
[not found] ` <20180112183512.GB102880-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2018-01-15 8:41 ` Claudiu Beznea
2018-01-15 12:43 ` Claudiu Beznea
2018-01-15 20:27 ` Andy Shevchenko
[not found] ` <CAHp75VcaFDEQ1cBzeU2eBj_vf19ok6EWLC07SOTQLRH8BQSbzA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-16 8:24 ` Claudiu Beznea
2018-01-17 23:14 ` Brian Norris
2018-01-18 9:11 ` Claudiu Beznea
2018-01-16 9:07 ` Neil Armstrong
2018-01-16 9:33 ` Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 02/16] pwm: pxa: update documentation regarding pwm-cells Claudiu Beznea
2018-01-19 22:30 ` Rob Herring
2018-01-22 8:47 ` Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 04/16] pwm: clps711x: " Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 05/16] ARM: dts: clps711x: update pwm-cells Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 07/16] arm64: dts: rockchip: " Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 08/16] drivers: pwm: core: extend PWM framework with PWM modes Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 10/16] pwm: Add " Claudiu Beznea
2018-01-19 22:34 ` Rob Herring
2018-01-22 8:54 ` Claudiu Beznea
[not found] ` <c5aeb8df-6aa8-cde4-9305-08777cac2f45-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
2018-01-22 18:12 ` Rob Herring
[not found] ` <CAL_JsqJho2OrdnHwRPpYsbNB4RFTq5qSLA=36D2zy=Mi7B8XwQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-23 10:40 ` Claudiu Beznea
2018-01-23 15:21 ` Rob Herring
2018-01-23 16:55 ` Claudiu Beznea
[not found] ` <1515766983-15151-1-git-send-email-claudiu.beznea-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
2018-01-12 14:22 ` [PATCH v2 03/16] pwm: cros-ec: update documentation regarding pwm-cells Claudiu Beznea
2018-01-12 18:31 ` Brian Norris
2018-01-15 9:01 ` Claudiu Beznea
2018-01-17 8:29 ` Claudiu Beznea
[not found] ` <c2078487-8cc6-429e-6c38-092d776c33aa-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
2018-01-17 23:10 ` Brian Norris
2018-01-18 9:18 ` Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 06/16] ARM: dts: pxa: update pwm-cells Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 09/16] drivers: pwm: core: add PWM mode to pwm_config() Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 11/16] pwm: add documentation for PWM modes Claudiu Beznea
2018-01-19 22:39 ` Rob Herring
2018-01-22 8:55 ` Claudiu Beznea
2018-01-12 14:23 ` [PATCH v2 13/16] drivers: pwm: core: add push-pull mode support Claudiu Beznea
2018-01-12 14:22 ` [PATCH v2 12/16] pwm: atmel: add pwm capabilities Claudiu Beznea
2018-01-12 14:23 ` [PATCH v2 14/16] pwm: add push-pull mode Claudiu Beznea
2018-01-12 14:23 ` Claudiu Beznea [this message]
[not found] ` <1515766983-15151-16-git-send-email-claudiu.beznea-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
2018-01-19 22:41 ` [PATCH v2 15/16] pwm: add documentation for pwm " Rob Herring
2018-01-12 14:23 ` [PATCH v2 16/16] pwm: atmel: add push-pull mode support Claudiu Beznea
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