linux-kernel - [PATCH] armv8: GPIO: enable port input and interrupt

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Message-Id: <20181129085150.8602-1-ying.zhang22455@nxp.com>
Date:   Thu, 29 Nov 2018 16:51:50 +0800
From:   ying.zhang22455@....com
To:     linux-kernel@...r.kernel.org
Cc:     Zhang Ying-22455 <ying.zhang22455@....com>
Subject: [PATCH] armv8: GPIO: enable port input and interrupt

From: Zhang Ying-22455 <ying.zhang22455@....com>

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>
---
 drivers/gpio/gpio-mpc8xxx.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 793518a..f97cd23 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -362,9 +362,10 @@ 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);
-- 
1.7.1