linux-kernel - [PATCH v2 2/2] gpio: tegra: Move driver registration to subsys

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Message-Id: <20180806091207.12586-2-digetx@gmail.com>
Date:   Mon,  6 Aug 2018 12:12:07 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Stefan Agner <stefan@...er.ch>,
        Marcel Ziswiler <marcel@...wiler.com>
Cc:     linux-tegra@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] gpio: tegra: Move driver registration to subsys_init level

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@...il.com>
Acked-by: Stefan Agner <stefan@...er.ch>
---

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