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MLK-20682 reset: gpio-reset: add suspend/resume callback 

The reset PIN may loss its state when system suspend due to GPIO
controller power off. Set pinctrl as "sleep" state to keep PIN
voltage during system suspend, and configurate pinctrl as "default"
state after system resume back. Because GPIO resume back earlier
than gpio-reset, then GPIO signal can control the PIN voltage again.

Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Arulpandiyan Vadivel <arulpandiyan_vadivel@mentor.com>
Signed-off-by: Shrikant Bobade <Shrikant_Bobade@mentor.com>
(cherry picked from commit ea5a9cdc1941afc36fd0f5a223ea762b85512130)
5.4-rM2-2.2.x-imx-squashed
Andy Duan 2018-12-20 17:08:20 +08:00 committed by Dong Aisheng
parent 80fcea5b45
commit a9c85cb2d8
1 changed files with 20 additions and 0 deletions
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20
drivers/reset/gpio-reset.c
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@ -167,6 +167,25 @@ static struct of_device_id gpio_reset_dt_ids[] = {
{ }
};
#ifdef CONFIG_PM_SLEEP
static int gpio_reset_suspend(struct device *dev)
{
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int gpio_reset_resume(struct device *dev)
{
pinctrl_pm_select_default_state(dev);
return 0;
}
#endif
static const struct dev_pm_ops gpio_reset_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(gpio_reset_suspend, gpio_reset_resume)
};
static struct platform_driver gpio_reset_driver = {
.probe = gpio_reset_probe,
.remove = gpio_reset_remove,
@ -174,6 +193,7 @@ static struct platform_driver gpio_reset_driver = {
.name = "gpio-reset",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpio_reset_dt_ids),
.pm = &gpio_reset_pm_ops,
},
};