* Marc Zyngier <maz@xxxxxxxxxxxxxxx> [090612 22:31]:
> On Fri, 12 Jun 2009 12:32:51 -0500
> Vikram Pandita <vikram.pandita@xxxxxx> wrote:
>
> > There is currently no provision for passing IRQ trigger flags for
> > serial IRQs with triggering requirements (such as GPIO IRQs.)
> >
> > This patch adds UPF_IRQ_TRIG_* flags which map on to IRQF_TRIGGER_*
> > flags.
> >
> > Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
> > Acked-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
>
> Note that this patch doesn't allow the interrupt to trigger on both
> edges (not that I have ever seen a 8250 with this behavior, but this
> is a valid configuration from an interrupt point of view).
To me it sounds like the it would be better to have unsigned
long irqflags in struct uart_port instead of trying to squeeze
the irqflags the flags field. We're already not covering all the
irqflags currently like Marc pointed out.
Regards,
Tony
> Aside from this remark:
> Acked-by: Marc Zyngier <maz@xxxxxxxxxxxxxxx>
>
> > ---
> > drivers/serial/8250.c | 10 ++++++++++
> > include/linux/serial_core.h | 4 ++++
> > 2 files changed, 14 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
> > index bab115e..8235ef5 100644
> > --- a/drivers/serial/8250.c
> > +++ b/drivers/serial/8250.c
> > @@ -1641,6 +1641,16 @@ static int serial_link_irq_chain(struct
> > uart_8250_port *up) struct irq_info *i;
> > int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ?
> > IRQF_SHARED : 0;
> > + /* Get IRQ Trigger Flag */
> > + if (up->port.flags & UPF_IRQ_TRIG_RISING)
> > + irq_flags |= IRQF_TRIGGER_RISING;
> > + else if (up->port.flags & UPF_IRQ_TRIG_FALLING)
> > + irq_flags |= IRQF_TRIGGER_FALLING;
> > + else if (up->port.flags & UPF_IRQ_TRIG_HIGH)
> > + irq_flags |= IRQF_TRIGGER_HIGH;
> > + else if (up->port.flags & UPF_IRQ_TRIG_LOW)
> > + irq_flags |= IRQF_TRIGGER_LOW;
> > +
> > mutex_lock(&hash_mutex);
> >
> > h = &irq_lists[up->port.irq % NR_IRQ_HASH];
> > diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> > index 57a97e5..07591d5 100644
> > --- a/include/linux/serial_core.h
> > +++ b/include/linux/serial_core.h
> > @@ -296,7 +296,11 @@ struct uart_port {
> > #define UPF_SPD_WARP ((__force upf_t) (0x1010))
> > #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
> > #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
> > +#define UPF_IRQ_TRIG_RISING ((__force upf_t) (1 << 8))
> > +#define UPF_IRQ_TRIG_FALLING ((__force upf_t) (1 << 9))
> > +#define UPF_IRQ_TRIG_HIGH ((__force upf_t) (1 << 10))
> > #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
> > +#define UPF_IRQ_TRIG_LOW ((__force upf_t) (1 << 12))
> > #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
> > #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
> > #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
>
> --
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