[RESEND,v5,5/9] pwm: add PWM modes

Commit Message

Claudiu Beznea Aug. 28, 2018, 1:01 p.m. UTC

Add PWM normal and complementary modes.

Signed-off-by: Claudiu Beznea <[e-mail]>
---
 Documentation/devicetree/bindings/pwm/pwm.txt |  9 +++++++--
 Documentation/pwm.txt                         | 26 +++++++++++++++++++++++---
 include/dt-bindings/pwm/pwm.h                 |  1 +
 3 files changed, 31 insertions(+), 5 deletions(-)

Comments

Rob Herring Aug. 28, 2018, 10:27 p.m. UTC | #1

On Tue, Aug 28, 2018 at 04:01:22PM +0300, Claudiu Beznea wrote:
> Add PWM normal and complementary modes.
> 
> Signed-off-by: Claudiu Beznea <[e-mail]>
> ---
>  Documentation/devicetree/bindings/pwm/pwm.txt |  9 +++++++--

Acked-by: Rob Herring <[e-mail]>

>  Documentation/pwm.txt                         | 26 +++++++++++++++++++++++---
>  include/dt-bindings/pwm/pwm.h                 |  1 +
>  3 files changed, 31 insertions(+), 5 deletions(-)

Patch

diff --git a/Documentation/devicetree/bindings/pwm/pwm.txt b/Documentation/devicetree/bindings/pwm/pwm.txt
index 8556263b8502..7c8aaac43f92 100644
--- a/Documentation/devicetree/bindings/pwm/pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/pwm.txt
@@ -46,11 +46,16 @@  period in nanoseconds.
 Optionally, the pwm-specifier can encode a number of flags (defined in
 <dt-bindings/pwm/pwm.h>) in a third cell:
 - PWM_POLARITY_INVERTED: invert the PWM signal polarity
+- PWM_MODE_COMPLEMENTARY: PWM complementary working mode (for PWM channels
+with two outputs); if not specified, the default for PWM channel will be
+used
 
-Example with optional PWM specifier for inverse polarity
+Example with optional PWM specifier for inverse polarity and complementary
+mode:
 
 	bl: backlight {
-		pwms = <&pwm 0 5000000 PWM_POLARITY_INVERTED>;
+		pwms = <&pwm 0 5000000
+			(PWM_MODE_COMPLEMENTARY | PWM_POLARITY_INVERTED)>;
 		pwm-names = "backlight";
 	};
 
diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
index 8fbf0aa3ba2d..912c43da8b48 100644
--- a/Documentation/pwm.txt
+++ b/Documentation/pwm.txt
@@ -61,9 +61,9 @@  In addition to the PWM state, the PWM API also exposes PWM arguments, which
 are the reference PWM config one should use on this PWM.
 PWM arguments are usually platform-specific and allows the PWM user to only
 care about dutycycle relatively to the full period (like, duty = 50% of the
-period). struct pwm_args contains 2 fields (period and polarity) and should
-be used to set the initial PWM config (usually done in the probe function
-of the PWM user). PWM arguments are retrieved with pwm_get_args().
+period). struct pwm_args contains 3 fields (period, polarity and mode) and
+should be used to set the initial PWM config (usually done in the probe
+function of the PWM user). PWM arguments are retrieved with pwm_get_args().
 
 Using PWMs with the sysfs interface
 -----------------------------------
@@ -110,6 +110,26 @@  channel that was exported. The following properties will then be available:
 	- 0 - disabled
 	- 1 - enabled
 
+  mode
+    Get/set PWM channel working mode.
+
+    Normal mode - for PWM channels with one output; this should be the
+        default working mode for every PWM channel; output waveforms looks
+        like this:
+             __    __    __    __
+    PWM   __|  |__|  |__|  |__|  |__
+            <--T-->
+
+    Complementary mode - for PWM channels with two outputs; output waveforms
+        looks line this:
+             __    __    __    __
+    PWMH1 __|  |__|  |__|  |__|  |__
+          __    __    __    __    __
+    PWML1   |__|  |__|  |__|  |__|
+            <--T-->
+
+    Where T is the signal period.
+
 Implementing a PWM driver
 -------------------------
 
diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h
index ab9a077e3c7d..b82279cc1787 100644
--- a/include/dt-bindings/pwm/pwm.h
+++ b/include/dt-bindings/pwm/pwm.h
@@ -11,5 +11,6 @@ 
 #define _DT_BINDINGS_PWM_PWM_H
 
 #define PWM_POLARITY_INVERTED			(1 << 0)
+#define PWM_MODE_COMPLEMENTARY			(1 << 1)
 
 #endif