lkml.org 
[lkml]   [2018]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 09/10] pwm: add documentation for pwm push-pull mode
    Date
    Add documentation for PWM push-pull mode.

    Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
    Reviewed-by: Rob Herring <robh@kernel.org>
    ---
    Documentation/devicetree/bindings/pwm/pwm.txt | 2 ++
    Documentation/pwm.txt | 16 ++++++++++++++++
    include/dt-bindings/pwm/pwm.h | 1 +
    3 files changed, 19 insertions(+)

    diff --git a/Documentation/devicetree/bindings/pwm/pwm.txt b/Documentation/devicetree/bindings/pwm/pwm.txt
    index c2b4b9ba0e3f..968dd786ad7c 100644
    --- a/Documentation/devicetree/bindings/pwm/pwm.txt
    +++ b/Documentation/devicetree/bindings/pwm/pwm.txt
    @@ -49,6 +49,8 @@ Optionally, the pwm-specifier can encode a number of flags (defined in
    - PWM_DTMODE_COMPLEMENTARY: PWM complementary working mode (for PWM
    channels two outputs); if not specified, the default for PWM channel will
    be used
    +- PWM_DTMODE_PUSH_PULL: PWM push-pull working modes (for PWM channels with
    +two outputs); if not specified the default for PWM channel will be used

    Example with optional PWM specifier for inverse polarity and complementary
    mode:
    diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
    index 59592f8cc381..174c371583b6 100644
    --- a/Documentation/pwm.txt
    +++ b/Documentation/pwm.txt
    @@ -128,6 +128,22 @@ channel that was exported. The following properties will then be available:
    PWML1 |__| |__| |__| |__|
    <--T-->

    + Push-pull mode - for PWM channels with two outputs; output waveforms
    + for a PWM channel with 2 outputs, in push-pull mode, with normal
    + polarity looks like this:
    + __ __
    + PWMH __| |________| |________
    + __ __
    + PWML ________| |________| |__
    + <--T-->
    +
    + If polarity is inversed:
    + __ ________ ________
    + PWMH |__| |__|
    + ________ ________ __
    + PWML |__| |__|
    + <--T-->
    +
    Where T is the signal period.

    Implementing a PWM driver
    diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h
    index b4d61269aced..674dfdd59595 100644
    --- a/include/dt-bindings/pwm/pwm.h
    +++ b/include/dt-bindings/pwm/pwm.h
    @@ -12,5 +12,6 @@

    #define PWM_POLARITY_INVERTED (1 << 0)
    #define PWM_DTMODE_COMPLEMENTARY (1 << 1)
    +#define PWM_DTMODE_PUSH_PULL (1 << 2)

    #endif
    --
    2.7.4
    \
     
     \ /
      Last update: 2018-02-22 13:05    [W:6.015 / U:0.332 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site