linux-kernel - [PATCH v7 5/6] pwm: add documentation for pwm push-pull mode

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Message-ID: <1545055999-23950-6-git-send-email-claudiu.beznea@microchip.com>
Date:   Mon, 17 Dec 2018 14:13:53 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <thierry.reding@...il.com>, <robh@...nel.org>, <corbet@....net>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>
CC:     <linux-pwm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Claudiu.Beznea@...rochip.com>
Subject: [PATCH v7 5/6] pwm: add documentation for pwm push-pull mode

From: Claudiu Beznea <claudiu.beznea@...rochip.com>

Add documentation for PWM push-pull mode.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---

Hi Rob,                                                                         
                                                                                
In prevous version I had your Reviewed-by tag on this patch but I removed it       
in this version since there are some changes b/w the previous one and this      
one. Please see bellow and let me know if you are ok with this.                                                        

Thank you,
Claudiu Beznea

Changes in v6:
- remove bindings part
- use 1/3 duty factor ratio
- use '^' symbols to emphasize the beginning of a new period
- use PWMx_y to refrer to output y of PWM x

 Documentation/pwm.txt | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
index 669fd4c9cc8e..80552627627d 100644
--- a/Documentation/pwm.txt
+++ b/Documentation/pwm.txt
@@ -130,6 +130,22 @@ channel that was exported. The following properties will then be available:
     PWMx_1   |__|    |__|    |__|    |__|
              ^       ^       ^       ^
 
+    Push-pull mode - for PWM channels with two outputs; output waveforms
+        for a PWM channel in push-pull mode, with normal polarity looks like
+        this:
+              __              __
+    PWMx_0 __|  |____________|  |__________
+                      __              __
+    PWMx_1 __________|  |____________|  |__
+             ^       ^       ^       ^
+
+    If polarity is inversed:
+           __    ____________    __________
+    PWMx_0   |__|            |__|
+           __________    ____________    __
+    PWMx_1           |__|            |__|
+             ^       ^       ^       ^
+
     Where '^' specifies the beginning of a period.
 
 Implementing a PWM driver
-- 
2.7.4