linux-kernel - [PATCH] gpio: 104-idio-16: Disable IRQ on device probe

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Message-ID: <20151122163855.GA18100@sophia>
Date:	Sun, 22 Nov 2015 11:38:55 -0500
From:	William Breathitt Gray <vilhelm.gray@...il.com>
To:	linus.walleij@...aro.org, gnurou@...il.com
Cc:	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpio: 104-idio-16: Disable IRQ on device probe

IRQ should be disabled on device probe so that the device IRQ is in a
known starting state. If IRQ is not disabled, interrupts may be reported
as handled by the IRQ handler, despite no irq_unmask calls made by the
user.

Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 drivers/gpio/gpio-104-idio-16.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 81b6904..efe3ff7 100644
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -242,6 +242,9 @@ static int __init idio_16_probe(struct platform_device *pdev)
 		goto err_gpio_register;
 	}
 
+	/* Disable IRQ by default */
+	outb(0, base + 2);
+
 	err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
 		handle_edge_irq, IRQ_TYPE_NONE);
 	if (err) {
-- 
2.4.10

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