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

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Date:   Wed, 29 May 2019 16:32:52 +0800
From:   Chuanhua Han <chuanhua.han@....com>
To:     shawnguo@...nel.org, leoyang.li@....com, robh+dt@...nel.org,
        mark.rutland@....com, linus.walleij@...aro.org,
        bgolaszewski@...libre.com
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Chuanhua Han <chuanhua.han@....com>,
        Zhang Ying-22455 <ying.zhang22455@....com>
Subject: [PATCH 1/3] gpio: mpc8xxx: Enable port input and interrupt

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@....com>
Signed-off-by: Chuanhua Han <chuanhua.han@....com>
---
 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