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>
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@ -43,13 +43,14 @@ because the name "backlight" would be used as fallback anyway.
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pwm-specifier typically encodes the chip-relative PWM number and the PWM
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pwm-specifier typically encodes the chip-relative PWM number and the PWM
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period in nanoseconds.
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period in nanoseconds.
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Optionally, the pwm-specifier can encode a number of flags in a third cell:
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Optionally, the pwm-specifier can encode a number of flags (defined in
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- bit 0: PWM signal polarity (0: normal polarity, 1: inverse polarity)
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<dt-bindings/pwm/pwm.h>) in a third cell:
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- PWM_POLARITY_INVERTED: invert the PWM signal polarity
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Example with optional PWM specifier for inverse polarity
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Example with optional PWM specifier for inverse polarity
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bl: backlight {
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bl: backlight {
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pwms = <&pwm 0 5000000 1>;
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pwms = <&pwm 0 5000000 PWM_POLARITY_INVERTED>;
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pwm-names = "backlight";
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pwm-names = "backlight";
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};
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};
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@ -0,0 +1,14 @@
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/*
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* This header provides constants for most PWM bindings.
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*
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* Most PWM bindings can include a flags cell as part of the PWM specifier.
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* In most cases, the format of the flags cell uses the standard values
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* defined in this header.
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*/
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#ifndef _DT_BINDINGS_PWM_PWM_H
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#define _DT_BINDINGS_PWM_PWM_H
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#define PWM_POLARITY_INVERTED (1 << 0)
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#endif
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