linux-kernel - [PATCH 4.17 308/336] gpio: uniphier: set legitimate irq trigger type in .to

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Date:   Wed,  1 Aug 2018 18:50:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Katsuhiro Suzuki <suzuki.katsuhiro@...ionext.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.17 308/336] gpio: uniphier: set legitimate irq trigger type in .to_irq hook

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masahiro Yamada <yamada.masahiro@...ionext.com>

commit bbfbf04c2d4ef673f657175456f6693c9225748a upstream.

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.
(drivers/irq/irq-uniphier-aidet.c)

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@...ionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Tested-by: Katsuhiro Suzuki <suzuki.katsuhiro@...ionext.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/gpio/gpio-uniphier.c
+++ b/drivers/gpio/gpio-uniphier.c
@@ -181,7 +181,11 @@ static int uniphier_gpio_to_irq(struct g
 	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);
 }