MLK-13638-4 regulator: fixed: add system pm routines for pinctrl

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>

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 988a747..27b6d75 100644 (file)
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -30,6 +30,7 @@
 #include <linux/of_gpio.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/machine.h>
+#include <linux/pinctrl/consumer.h>
 
 struct fixed_voltage_data {
        struct regulator_desc desc;
@@ -199,11 +200,32 @@ 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,
        },
 };