From 322f6a3182d42df18059a89c53b09d33919f755e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johnson=20CH=20Chen=20=28=E9=99=B3=E6=98=AD=E5=8B=B3=29?= <JohnsonCH.Chen@moxa.com>
Date: Tue, 26 Nov 2019 06:51:11 +0000
Subject: [PATCH] gpio: mpc8xxx: Add platform device to gpiochip->parent
Git-commit: 322f6a3182d42df18059a89c53b09d33919f755e
Patch-mainline: v5.5-rc4
References: git-fixes

Dear Linus Walleij,

In old kernels, some APIs still try to use parent->of_node from struct gpio_chip,
and it could be resulted in kernel panic because parent is NULL. Adding platform
device to gpiochip->parent can fix this problem.

Signed-off-by: Johnson Chen <johnsonch.chen@moxa.com>
Link: https://patchwork.kernel.org/patch/11234609
Link: https://lore.kernel.org/r/HK0PR01MB3521489269F76467DFD7843FFA450@HK0PR01MB3521.apcprd01.prod.exchangelabs.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpio/gpio-mpc8xxx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index f1e164cecff8..5ae30de3490a 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -346,6 +346,7 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	gc = &mpc8xxx_gc->gc;
+	gc->parent = &pdev->dev;
 
 	if (of_property_read_bool(np, "little-endian")) {
 		ret = bgpio_init(gc, &pdev->dev, 4,
-- 
2.26.2