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SubjectRe: [PATCH 2/2] gpiolib: introduce gpio_set_deglitch
On 16:14 Fri 25 Nov     , Felipe Balbi wrote:
> Hi,
>
> On Fri, Nov 25, 2011 at 03:08:40PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > this will allow to manage the Glitch Input Filter
> > as present on AT91 as example
> >
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> > Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> > Cc: Grant Likely <grant.likely@secretlab.ca>
> > ---
> > drivers/gpio/gpiolib.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
> > include/asm-generic/gpio.h | 4 ++++
> > include/linux/gpio.h | 5 +++++
> > 3 files changed, 53 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index b7e5e75..d2b1833 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -1563,6 +1563,50 @@ fail:
> > }
> > EXPORT_SYMBOL_GPL(gpio_set_pullup);
> >
> > +/**
> > + * gpio_set_deglitch - sets @deglitch for a @gpio
> > + * @gpio: the gpio to set deglitch
> > + * @deglitch: deglitch level
> > + */
> > +int gpio_set_deglitch(unsigned gpio, unsigned deglitch)
>
> sounds a lot like debounce, what's the difference ?
deglitch allow you to filter the fact that the line take time to be stable
go to 1 and 0

debounce will set 2 different threshold for changing the state from 0 to 1 and
invertly

Best Regards,
J.


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