[PATCH] gpio: uniphier: set legitimate irq trigger type in .to_irq hook

From: Masahiro Yamada
Date: Thu Jun 14 2018 - 01:28:57 EST

If a GPIO chip is a part of a hierarchy IRQ domain, there is no
way to specify the trigger type when gpio(d)_to_irq() allocates an
interrupt on-the-fly.

Currently, uniphier_gpio_to_irq() sets IRQ_TYPE_NONE, but it causes
an error in the .alloc() hook of the parent domain.

Even if we change irq-uniphier-aidet.c to accept the NONE type,
GIC complains about it since commit 83a86fbb5b56 ("irqchip/gic:
Loudly complain about the use of IRQ_TYPE_NONE").

Instead, use IRQ_TYPE_LEVEL_HIGH as a temporary value when an irq
is allocated. irq_set_irq_type() will override it when the irq is
really requested.

Fixes: dbe776c2ca54 ("gpio: uniphier: add UniPhier GPIO controller driver")
Reported-by: Katsuhiro Suzuki <suzuki.katsuhiro@xxxxxxxxxxxxx>
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Tested-by: Katsuhiro Suzuki <suzuki.katsuhiro@xxxxxxxxxxxxx>

drivers/gpio/gpio-uniphier.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
index d3cf950..58faeb1 100644
--- a/drivers/gpio/gpio-uniphier.c
+++ b/drivers/gpio/gpio-uniphier.c
@@ -181,7 +181,11 @@ static int uniphier_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
fwspec.fwnode = of_node_to_fwnode(chip->parent->of_node);
fwspec.param_count = 2;
fwspec.param[0] = offset - UNIPHIER_GPIO_IRQ_OFFSET;
- fwspec.param[1] = IRQ_TYPE_NONE;
+ /*
+ * IRQ_TYPE_NONE is rejected by the parent irq domain. Set LEVEL_HIGH
+ * temporarily. Anyway, ->irq_set_type() will override it later.
+ */
+ fwspec.param[1] = IRQ_TYPE_LEVEL_HIGH;

return irq_create_fwspec_mapping(&fwspec);