[PATCH v2 1/1] regulator: fixed: add suspend pm routines for pinctrl

[Peter Chen]

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@xxxxxxx>
---

Changes for v2:
- Fixed build error reported by Kbuild robot, the header file
  was not added.

 drivers/regulator/fixed.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index a43b0e8..4a9e6da 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -33,6 +33,7 @@
 #include <linux/acpi.h>
 #include <linux/property.h>
 #include <linux/gpio/consumer.h>
+#include <linux/pinctrl/consumer.h>
 
 struct fixed_voltage_data {
 	struct regulator_desc desc;
@@ -245,11 +246,32 @@ static const struct of_device_id fixed_of_match[] = {
 MODULE_DEVICE_TABLE(of, fixed_of_match);
 #endif
 
+#ifdef CONFIG_PM_SLEEP
+static int reg_fixed_voltage_suspend(struct device *dev)
+{
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+static int reg_fixed_voltage_resume(struct device *dev)
+{
+	pinctrl_pm_select_default_state(dev);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops reg_fixed_voltage_pm_ops = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(reg_fixed_voltage_suspend,
+		reg_fixed_voltage_resume)
+};
+
 static struct platform_driver regulator_fixed_voltage_driver = {
 	.probe		= reg_fixed_voltage_probe,
 	.driver		= {
 		.name		= "reg-fixed-voltage",
 		.of_match_table = of_match_ptr(fixed_of_match),
+		.pm = &reg_fixed_voltage_pm_ops,
 	},
 };
 
-- 
2.7.4