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pwm: Add PWM polarity flag macro for DT 

Define a PWM_POLARITY_INVERTED macro in include/dt-bindings/pwm/pwm.h to
be used by device tree sources.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Laurent Pinchart 2013-07-18 00:54:21 +02:00 committed by Thierry Reding
parent cfb9e4c40e
commit 9344dade4f
2 changed files with 18 additions and 3 deletions
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7
Documentation/devicetree/bindings/pwm/pwm.txt
View File

@ -43,13 +43,14 @@ because the name "backlight" would be used as fallback anyway.
pwm-specifier typically encodes the chip-relative PWM number and the PWM
period in nanoseconds.
Optionally, the pwm-specifier can encode a number of flags in a third cell:
- bit 0: PWM signal polarity (0: normal polarity, 1: inverse polarity)
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
Example with optional PWM specifier for inverse polarity
bl: backlight {
pwms = <&pwm 0 5000000 1>;
pwms = <&pwm 0 5000000 PWM_POLARITY_INVERTED>;
pwm-names = "backlight";
};

14
include/dt-bindings/pwm/pwm.h Normal file
View File

@ -0,0 +1,14 @@
/*
* This header provides constants for most PWM bindings.
*
* Most PWM bindings can include a flags cell as part of the PWM specifier.
* In most cases, the format of the flags cell uses the standard values
* defined in this header.
*/
#ifndef _DT_BINDINGS_PWM_PWM_H
#define _DT_BINDINGS_PWM_PWM_H
#define PWM_POLARITY_INVERTED (1 << 0)
#endif