diff options
| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-07-18 00:54:21 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2013-09-03 13:08:09 +0200 |
| commit | 9344dade4f9438c26f7eb517caeceee4d52a3a68 (patch) | |
| tree | bb03808265ef5c1d4d1a95b95d7b4eecdb89d074 | |
| parent | cfb9e4c40e87dffdce96d3a95c33d01f441b2470 (diff) | |
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>
| -rw-r--r-- | Documentation/devicetree/bindings/pwm/pwm.txt | 7 | ||||
| -rw-r--r-- | include/dt-bindings/pwm/pwm.h | 14 |
2 files changed, 18 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/pwm/pwm.txt b/Documentation/devicetree/bindings/pwm/pwm.txt index 06e67247859a..8556263b8502 100644 --- a/Documentation/devicetree/bindings/pwm/pwm.txt +++ b/Documentation/devicetree/bindings/pwm/pwm.txt @@ -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"; }; diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h new file mode 100644 index 000000000000..96f49e82253e --- /dev/null +++ b/include/dt-bindings/pwm/pwm.h @@ -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 |