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SubjectRe: [PATCH] USB: ISP1760: Add flags for interrupt polarity and edge/level trigger
On Wed, Dec 14, 2011 at 08:57:33AM +0100, Alexander Stein wrote:
> On Tuesday 13 December 2011 10:00:10 Greg KH wrote:
> > On Tue, Dec 13, 2011 at 10:33:13AM +0100, Alexander Stein wrote:
> > > Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
> > > ---
> > >
> > > drivers/usb/host/isp1760-if.c | 4 ++++
> > > include/linux/usb/isp1760.h | 2 ++
> > > 2 files changed, 6 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/drivers/usb/host/isp1760-if.c
> > > b/drivers/usb/host/isp1760-if.c index a7dc1e1..0ef9867 100644
> > > --- a/drivers/usb/host/isp1760-if.c
> > > +++ b/drivers/usb/host/isp1760-if.c
> > > @@ -388,6 +388,10 @@ static int __devinit isp1760_plat_probe(struct
> > > platform_device *pdev)>
> > > devflags |= ISP1760_FLAG_DACK_POL_HIGH;
> > >
> > > if (priv->dreq_polarity_high)
> > >
> > > devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
> > >
> > > + if (priv->interrupt_polarity_high)
> > > + devflags |= ISP1760_FLAG_INTR_POL_HIGH;
> > > + if (priv->interrupt_edge_triggered)
> > > + devflags |= ISP1760_FLAG_INTR_EDGE_TRIG;
> > >
> > > }
> > >
> > > hcd = isp1760_register(mem_res->start, mem_size, irq_res->start,
> > >
> > > diff --git a/include/linux/usb/isp1760.h b/include/linux/usb/isp1760.h
> > > index de7de53..c5edbc8 100644
> > > --- a/include/linux/usb/isp1760.h
> > > +++ b/include/linux/usb/isp1760.h
> > > @@ -13,6 +13,8 @@ struct isp1760_platform_data {
> > >
> > > unsigned analog_oc:1; /* Analog overcurrent */
> > > unsigned dack_polarity_high:1; /* DACK active high */
> > > unsigned dreq_polarity_high:1; /* DREQ active high */
> > >
> > > + unsigned interrupt_polarity_high:1;
> > > + unsigned interrupt_edge_triggered:1;
> >
> > So you added these, and you check them, but who sets them? What is the
> > point of this patch at this point in time?
>
> These platform data bits are set by board configurations, which is completly
> optional. So currently maybe noone sets/use it, but in future someone may need
> it. Also dreq_polarity_high is also there and I only found board files setting
> them to 0... So why not add the feature bits too?

Because we don't add "features" to the kernel that are not used, that's
just unneeded cruft.

If you have a real need and an actual user of these flags, then I will
be glad to accept this patch.

thanks,

greg k-h


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