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Commit 9344dade authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Thierry Reding
Browse files

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: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent cfb9e4c4

Documentation/devicetree/bindings/pwm/pwm.txt

+4 −3
Original line number Original line Diff line number Diff line
@@ -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

pwm-specifier typically encodes the chip-relative PWM number and the PWM

period in nanoseconds.

period in nanoseconds.





Optionally, the pwm-specifier can encode a number of flags in a third cell:

Optionally, the pwm-specifier can encode a number of flags (defined in

- bit 0: PWM signal polarity (0: normal polarity, 1: inverse polarity)

<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

Example with optional PWM specifier for inverse polarity





	bl: backlight {

	bl: backlight {

		pwms = <&pwm 0 5000000 1>;

		pwms = <&pwm 0 5000000 PWM_POLARITY_INVERTED>;

		pwm-names = "backlight";

		pwm-names = "backlight";

	};

	};

include/dt-bindings/pwm/pwm.h

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+14 −0
Original line number Original line Diff line number Diff line 
/*

 * 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