There is a bug in regards to deferred probing within the drivers core
that causes GPIO-driver to suspend before its users. The bug appears if
GPIO-driver probe is getting deferred, which happens after introducing
dependency on PINCTRL-driver for the GPIO-driver by defining "gpio-ranges"
property in device-tree. The bug in the drivers core is old (more than 4
years now) and is well known, unfortunately there is no easy fix for it.
The good news is that we can workaround the deferred probe issue by
changing GPIO / PINCTRL drivers registration order and hence by moving
PINCTRL driver registration to the arch_init level and GPIO to the
subsys_init.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
Acked-by: Stefan Agner <stefan@xxxxxxxx>
---
Changelog:
v2: Corrected commit message with s/to suspend after/to suspend before/.
drivers/gpio/gpio-tegra.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index 2d940785bad0..a53c77db9744 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -712,4 +712,4 @@ static int __init tegra_gpio_init(void)
{
return platform_driver_register(&tegra_gpio_driver);
}
-postcore_initcall(tegra_gpio_init);
+subsys_initcall(tegra_gpio_init);
--
2.18.0
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