[RFC PATCH 4/7] dt-bindings: pwm: add description of PWM polarity

[Oleksandr Suvorov]

Move the description of the PWM signal polarity from
<linux/pwm.h>, prepare for removing the polarity
definition from <linux/pwm.h>.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@xxxxxxxxxxx>
---

 include/dt-bindings/pwm/pwm.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h
index 6b58caa6385e..c07da2088a61 100644
--- a/include/dt-bindings/pwm/pwm.h
+++ b/include/dt-bindings/pwm/pwm.h
@@ -10,7 +10,16 @@
 #ifndef _DT_BINDINGS_PWM_PWM_H
 #define _DT_BINDINGS_PWM_PWM_H
 
+/**
+ * a high signal for the duration of the duty-cycle, followed by a low signal
+ * for the remainder of the pulse period.
+ */
 #define PWM_POLARITY_NORMAL			0
+
+/**
+ * a low signal for the duration of the duty-cycle, followed by a high signal
+ * for the remainder of the pulse period.
+ */
 #define PWM_POLARITY_INVERTED			(1 << 0)
 
 #endif
-- 
2.24.1