diff mbox

[02/14] mfd: ab8500: provide a irq_set_type() function

Message ID 1360093715-6348-3-git-send-email-linus.walleij@stericsson.com (mailing list archive)
State New, archived
Headers show

Commit Message

Linus Walleij Feb. 5, 2013, 7:48 p.m. UTC 
From: Lee Jones <lee.jones@linaro.org>

In the AB8500 IRQ mask and unmask functions, we rely on testing for
IRQ_TYPE_EDGE_RISING and IRQ_TYPE_EDGE_FALLING interrupts to
physically mask and unmask the correct interrupt lines. In order
for us to do that, the trigger needs to be set in the associated
flags. However, unless a irq_set_type() function pointer is passed
when registering the IRQ chip, the IRQ subsystem will refuse to do
it. For that reason, we're providing one.

Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Sam, it'd be nice if you could ACK these first four patches,
the series basically simplifies things a lot by not cascading
the AB8500 IRQs and duplicate code in the pinctrl driver.
---
 drivers/mfd/ab8500-core.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Stephen Warren Feb. 7, 2013, 12:07 a.m. UTC | #1 
On 02/05/2013 12:48 PM, Linus Walleij wrote:
> From: Lee Jones <lee.jones@linaro.org>
> 
> In the AB8500 IRQ mask and unmask functions, we rely on testing for
> IRQ_TYPE_EDGE_RISING and IRQ_TYPE_EDGE_FALLING interrupts to
> physically mask and unmask the correct interrupt lines. In order
> for us to do that, the trigger needs to be set in the associated
> flags. However, unless a irq_set_type() function pointer is passed
> when registering the IRQ chip, the IRQ subsystem will refuse to do
> it. For that reason, we're providing one.

> diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c

> +static int ab8500_irq_set_type(struct irq_data *data, unsigned int type)
> +{
> +	return 0;
> +}

I think patch 0 implied that only rising/falling edges can be detected,
not levels? If so, should that function validate that the requested type
can be supported?
Linus Walleij Feb. 7, 2013, 10:01 a.m. UTC | #2 
On Thu, Feb 7, 2013 at 10:08 AM, Lee Jones <lee.jones@linaro.org> wrote:

> Great spot/idea. But then this won't work at all until I can write a fixup.
>
> Will you allow me to write a follow-up patch please?

For me a sequel is OK, especially given that this thing doesn't make
things any worse than they are already, but actually checking supported
types will not be trivial, because...

>> > +static int ab8500_irq_set_type(struct irq_data *data, unsigned int
>> > type)
>> > +{
>> > +     return 0;
>> > +}

This applies to *ALL* AB8500 IRQs, and some of them actually support
rising/falling, apart from the GPIO ones, so it's not enough to just handle
the GPIO IRQs here.

Yours,
Linus Walleij
diff mbox

Patch

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index e1ba0be..aa5937e 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -403,6 +403,11 @@  static void ab8500_irq_unmask(struct irq_data *data)
 		ab8500->mask[index] &= ~mask;
 }
 
+static int ab8500_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	return 0;
+}
+
 static struct irq_chip ab8500_irq_chip = {
 	.name			= "ab8500",
 	.irq_bus_lock		= ab8500_irq_lock,
@@ -410,6 +415,7 @@  static struct irq_chip ab8500_irq_chip = {
 	.irq_mask		= ab8500_irq_mask,
 	.irq_disable		= ab8500_irq_mask,
 	.irq_unmask		= ab8500_irq_unmask,
+	.irq_set_type		= ab8500_irq_set_type,
 };
 
 static int ab8500_handle_hierarchical_line(struct ab8500 *ab8500,