gpio: mpc8xxx: Add platform device to gpiochip->parent

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>

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index f1e164cecff80375ddcfa89017d15fe2af277886..5ae30de3490ac84118da2da0b169f8f24b9da4b9 100644 (file)
--- 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,