[PATCH 5.4 097/191] gpio/mpc8xxx: fix qoriq GPIO reading

[Greg Kroah-Hartman]

From: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>

[ Upstream commit 787b64a43f7acacf8099329ea08872e663f1e74f ]

Qoriq requires the IBE register to be set to enable GPIO inputs to be
read.  Set it.

Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/E1iX3HC-00069N-0T@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpio/gpio-mpc8xxx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 16a47de29c94..b863421ae730 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -386,6 +386,9 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 
 	gc->to_irq = mpc8xxx_gpio_to_irq;
 
+	if (of_device_is_compatible(np, "fsl,qoriq-gpio"))
+		gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
+
 	ret = gpiochip_add_data(gc, mpc8xxx_gc);
 	if (ret) {
 		pr_err("%pOF: GPIO chip registration failed with status %d\n",
-- 
2.20.1