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gpio/gpiolib: Forbid irqchip default trigger if probed over DT 

Using a default trigger is a bad idea if using DT to configure
interrupts, as the device's interrupt specifier will always contain
the trigger configuration.

Let's warn about that particular situation, and revert to not
having a default. Hopefully, the couple of drivers still using
this feature will quickly be fixed.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Marc Zyngier 2016-09-07 09:12:11 +01:00 committed by Linus Walleij
parent 5d2f1d6ef9
commit 332e99d5ae
1 changed files with 9 additions and 0 deletions
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9
drivers/gpio/gpiolib.c
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@ -1613,6 +1613,15 @@ int _gpiochip_irqchip_add(struct gpio_chip *gpiochip,
if (gpiochip->of_node)
of_node = gpiochip->of_node;
#endif
/*
* Specifying a default trigger is a terrible idea if DT is
* used to configure the interrupts, as you may end-up with
* conflicting triggers. Tell the user, and reset to NONE.
*/
if (WARN(of_node && type != IRQ_TYPE_NONE,
"%s: Ignoring %d default trigger\n", of_node->full_name, type))
type = IRQ_TYPE_NONE;
gpiochip->irqchip = irqchip;
gpiochip->irq_handler = handler;
gpiochip->irq_default_type = type;