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    SubjectRe: [PATCH 1/3] PWM: add pwm framework support
    On Thu, Jun 30, 2011 at 20:33, H Hartley Sweeten wrote:
    > On Thursday, June 30, 2011 4:24 PM, Ryan Mallon wrote:
    >> On 01/07/11 03:02, Sascha Hauer wrote:
    >>> I think that you made the fundamental mistake to completly ignore the
    >>> existing pwm API and its users. With a competing api we are basically
    >>> stuck. We can't convert the existing hardware drivers to the new API
    >>> because leds-pwm.c, pwm_bl.c and others still depend on the old API and
    >>> boards using it would break.
    >>
    >> I don't think this is really a blocker to Bill's patches. There are
    >> three (that I can see) pwm users currently:
    >> drivers/video/backlight/pwm_bl.c
    >> drivers/leds/leds-pwm.c
    >> drivers/input/misc/pwm-beeper.c
    >>
    >> All of those drivers are trivial and good easily be updated to work with
    >> Bill's patches. Bill already provided a leds-pwm driver.
    >
    > I agree with Ryan.  The three drivers listed above appear to be the only
    > pwm "user" drivers.  They are all trivial and could be updated easily.

    indeed ... the current pwm API is almost toy like in its simplicity.

    > The "core" drivers using the existing API appear to be:
    > arch/blackfin/kernel/pwm.c

    i only wrote this because Bill's subsystem wasnt yet merged. but i
    made sure that it was done in such a way that it's trivial to convert
    over to Bill's work once it's done.
    -mike
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