[PATCH v6 2/6] pwm: add PWM modes

From: Claudiu.Beznea
Date: Mon Dec 17 2018 - 09:03:27 EST


From: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>

Add PWM normal and complementary modes.

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

Hi Rob,

In prevous version I had your Acked-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 DT bindings since they were also removed from code
- 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 | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
index 8fbf0aa3ba2d..669fd4c9cc8e 100644
--- a/Documentation/pwm.txt
+++ b/Documentation/pwm.txt
@@ -110,6 +110,28 @@ channel that was exported. The following properties will then be available:
- 0 - disabled
- 1 - enabled

+ mode
+ Get/set PWM channel working mode.
+
+ In the following description PWMx_y refers to output y of PWM with ID x.
+
+ Normal mode - for PWM channels with one output; this should be the
+ default working mode for every PWM channel; output waveforms looks
+ like this:
+ __ __ __ __
+ PWMx __| |____| |____| |____| |__
+ ^ ^ ^ ^
+
+ Complementary mode - for PWM channels with two outputs; output waveforms
+ looks line this:
+ __ __ __ __
+ PWMx_0 __| |____| |____| |____| |__
+ __ ____ ____ ____ __
+ PWMx_1 |__| |__| |__| |__|
+ ^ ^ ^ ^
+
+ Where '^' specifies the beginning of a period.
+
Implementing a PWM driver
-------------------------

--
2.7.4