linux-kernel - [PATCH v1] gpio: mpc8xxx: Add shutdown function.

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Date:   Wed,  8 Apr 2020 18:21:17 +0800
From:   Hui Song <hui.song_1@....com>
To:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Song Hui <hui.song_1@....com>
Subject: [PATCH v1] gpio: mpc8xxx: Add shutdown function.

From: Song Hui <hui.song_1@....com>

The shutdown function needed to make interrupt handler to be NULL
when kexec execute.

Signed-off-by: Song Hui <hui.song_1@....com>
---
 drivers/gpio/gpio-mpc8xxx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 604dfec..a24e6c5 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -446,9 +446,21 @@ static int mpc8xxx_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int mpc8xxx_shutdown(struct platform_device *pdev)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
+
+	if (mpc8xxx_gc->irq) {
+		irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
+		irq_domain_remove(mpc8xxx_gc->irq);
+	}
+
+	return 0;
+}
 static struct platform_driver mpc8xxx_plat_driver = {
 	.probe		= mpc8xxx_probe,
 	.remove		= mpc8xxx_remove,
+	.shutdown	= mpc8xxx_shutdown,
 	.driver		= {
 		.name = "gpio-mpc8xxx",
 		.of_match_table	= mpc8xxx_gpio_ids,
-- 
2.9.5