linux-kernel - Re: [PATCH] serial: 8250: add IRQ trigger support

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Message-ID: <20090622124037.GD7352@atomide.com>
Date:	Mon, 22 Jun 2009 15:40:37 +0300
From:	Tony Lindgren <tony@...mide.com>
To:	Marc Zyngier <maz@...terjones.org>
Cc:	Vikram Pandita <vikram.pandita@...com>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH] serial: 8250: add IRQ trigger support

* Marc Zyngier <maz@...terjones.org> [090612 22:31]:
> On Fri, 12 Jun 2009 12:32:51 -0500
> Vikram Pandita <vikram.pandita@...com> 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@...com>
> > Acked-by: Kevin Hilman <khilman@...prootsystems.com>
> 
> 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@...terjones.org>
> 
> > ---
> >  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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