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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-07-18 00:54:21 +0200 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-03-20 17:42:08 +0900 |
| commit | 315b04e463da4b9202aedf605df822892742de21 (patch) | |
| tree | e966fd5e2ee22c8c9c980abef3a4810b62851eec | |
| parent | 9680e9f0e255ce6a0aae52506ad96b70f9d4f3d3 (diff) | |
| download | linux-3.10-315b04e463da4b9202aedf605df822892742de21.tar.gz linux-3.10-315b04e463da4b9202aedf605df822892742de21.tar.bz2 linux-3.10-315b04e463da4b9202aedf605df822892742de21.zip | |
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 06e67247859..8556263b850 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 00000000000..96f49e82253 --- /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 |