| From 909d7c56d70416b1afabfba6d3d64582795c510a Mon Sep 17 00:00:00 2001 |
| From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> |
| Date: Thu, 18 Jul 2013 00:54:21 +0200 |
| Subject: 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> |
| (cherry picked from commit 9344dade4f9438c26f7eb517caeceee4d52a3a68) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| Documentation/devicetree/bindings/pwm/pwm.txt | 7 ++++--- |
| include/dt-bindings/pwm/pwm.h | 14 ++++++++++++++ |
| 2 files changed, 18 insertions(+), 3 deletions(-) |
| create mode 100644 include/dt-bindings/pwm/pwm.h |
| |
| 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 |
| -- |
| 1.8.5.rc3 |
| |