[PATCH 1/3] gpio: mpc8xxx: Enable port input and interrupt

[Chuanhua Han]

The GPIO Input Buffer Enable register is used to control the input
enable of each individual GPIO port. When an individual GPIO port's
direction is set to input (GPIO_GPDIR[DRn=0]), the associated
input enable must be set (GPIOxGPIE[IEn]=1) to propagate the port
value to the GPIO Data Register.

This patch enable port input and interrupt.

Signed-off-by: Zhang Ying-22455 <ying.zhang22455@xxxxxxx>
Signed-off-by: Chuanhua Han <chuanhua.han@xxxxxxx>
---
 drivers/gpio/gpio-mpc8xxx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index c8673a5d9412..555e0e7957d9 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -373,9 +373,10 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 	if (!mpc8xxx_gc->irq)
 		return 0;
 
-	/* ack and mask all irqs */
+	/* ack and enable irqs */
 	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
-	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0xffffffff);
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR2, 0xffffffff);
 
 	irq_set_chained_handler_and_data(mpc8xxx_gc->irqn,
 					 mpc8xxx_gpio_irq_cascade, mpc8xxx_gc);
-- 
2.17.1