From: Peter Chen <peter.chen@nxp.com>
To: <myungjoo.ham@samsung.com>, <cw00.choi@samsung.com>
Cc: <rogerq@ti.com>, <linux-kernel@vger.kernel.org>,
Peter Chen <peter.chen@nxp.com>
Subject: [PATCH v2 1/1] extcon: usb-gpio: add pinctrl operation during system PM
Date: Wed, 4 Jan 2017 15:19:51 +0800 [thread overview]
Message-ID: <1483514391-20252-1-git-send-email-peter.chen@nxp.com> (raw)
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@nxp.com>
---
Changes for v2:
- Add header file for pinctrl to avoid build error
- Only set pin as "sleep" state when the wakeup is not requested
drivers/extcon/extcon-usb-gpio.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index d589c5f..a5e1882 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/acpi.h>
+#include <linux/pinctrl/consumer.h>
#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
@@ -245,6 +246,9 @@ static int usb_extcon_suspend(struct device *dev)
if (info->vbus_gpiod)
disable_irq(info->vbus_irq);
+ if (!device_may_wakeup(dev))
+ pinctrl_pm_select_sleep_state(dev);
+
return ret;
}
@@ -253,6 +257,9 @@ static int usb_extcon_resume(struct device *dev)
struct usb_extcon_info *info = dev_get_drvdata(dev);
int ret = 0;
+ if (!device_may_wakeup(dev))
+ 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
next reply other threads:[~2017-01-04 7:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20170104071934epcas4p390f218107287b6096a6fe861ea730c31@epcas4p3.samsung.com>
2017-01-04 7:19 ` Peter Chen [this message]
2017-01-06 8:30 ` [PATCH v2 1/1] extcon: usb-gpio: add pinctrl operation during system PM Chanwoo Choi
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