linux-kernel - [PATCH 1/1] extcon: usb-gpio: add pinctrl operation during system PM

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Date:   Tue, 3 Jan 2017 16:17:53 +0800
From:   Peter Chen <peter.chen@....com>
To:     <myungjoo.ham@...sung.com>, <cw00.choi@...sung.com>
CC:     <linux-kernel@...r.kernel.org>, <rogerq@...com>,
        Peter Chen <peter.chen@....com>
Subject: [PATCH 1/1] extcon: usb-gpio: add pinctrl operation during system PM

At some systems, the pinctrl setting will be lost or needs to
set as "sleep" state to save power consumption. So, we need to
configure pinctrl as "sleep" state when system enters suspend,
and as "default" state after system resumes. In this way, the
pinctrl value can be recovered as "default" state after resuming.

Signed-off-by: Peter Chen <peter.chen@....com>
---
 drivers/extcon/extcon-usb-gpio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index d589c5f..f7172ae 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -244,6 +244,7 @@ static int usb_extcon_suspend(struct device *dev)
 		disable_irq(info->id_irq);
 	if (info->vbus_gpiod)
 		disable_irq(info->vbus_irq);
+	pinctrl_pm_select_sleep_state(dev);
 
 	return ret;
 }
@@ -253,6 +254,7 @@ static int usb_extcon_resume(struct device *dev)
 	struct usb_extcon_info *info = dev_get_drvdata(dev);
 	int ret = 0;
 
+	pinctrl_pm_select_default_state(dev);
 	if (device_may_wakeup(dev)) {
 		if (info->id_gpiod) {
 			ret = disable_irq_wake(info->id_irq);
-- 
2.7.4