iio: imu: inv_icm42600: Move exports to IIO_ICM42600 namespace

As these exports are only relevant to core module and users in the
bus specific modules, move them out of the main kernel namespace.

Includes using EXPORT_NS_GPL_DEV_PM_OPS() and the simplifications that
brings by allowing the compiler to remove unused struct dev_pm_ops
and callbacks without needing explicit __maybe_unused markings.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

--
EXPORT_NS_GPL_DEV_PM_OPS()

v2: Switch to Paul's more flexible version of the
Acked-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://lore.kernel.org/r/20220925155719.3316280-5-jic23@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/inv_icm42600/inv_icm42600_core.c

@@ -41,7 +41,7 @@ const struct regmap_config inv_icm42600_regmap_config = {
 	.ranges = inv_icm42600_regmap_ranges,
 	.num_ranges = ARRAY_SIZE(inv_icm42600_regmap_ranges),
 };
-EXPORT_SYMBOL_GPL(inv_icm42600_regmap_config);
+EXPORT_SYMBOL_NS_GPL(inv_icm42600_regmap_config, IIO_ICM42600);
 
 struct inv_icm42600_hw {
 	uint8_t whoami;
@@ -660,13 +660,13 @@ int inv_icm42600_core_probe(struct regmap *regmap, int chip, int irq,
 
 	return devm_add_action_or_reset(dev, inv_icm42600_disable_pm, dev);
 }
-EXPORT_SYMBOL_GPL(inv_icm42600_core_probe);
+EXPORT_SYMBOL_NS_GPL(inv_icm42600_core_probe, IIO_ICM42600);
 
 /*
  * Suspend saves sensors state and turns everything off.
  * Check first if runtime suspend has not already done the job.
  */
-static int __maybe_unused inv_icm42600_suspend(struct device *dev)
+static int inv_icm42600_suspend(struct device *dev)
 {
 	struct inv_icm42600_state *st = dev_get_drvdata(dev);
 	int ret;
@@ -706,7 +706,7 @@ static int __maybe_unused inv_icm42600_suspend(struct device *dev)
  * System resume gets the system back on and restores the sensors state.
  * Manually put runtime power management in system active state.
  */
-static int __maybe_unused inv_icm42600_resume(struct device *dev)
+static int inv_icm42600_resume(struct device *dev)
 {
 	struct inv_icm42600_state *st = dev_get_drvdata(dev);
 	int ret;
@@ -739,7 +739,7 @@ static int __maybe_unused inv_icm42600_resume(struct device *dev)
 }
 
 /* Runtime suspend will turn off sensors that are enabled by iio devices. */
-static int __maybe_unused inv_icm42600_runtime_suspend(struct device *dev)
+static int inv_icm42600_runtime_suspend(struct device *dev)
 {
 	struct inv_icm42600_state *st = dev_get_drvdata(dev);
 	int ret;
@@ -761,7 +761,7 @@ static int __maybe_unused inv_icm42600_runtime_suspend(struct device *dev)
 }
 
 /* Sensors are enabled by iio devices, no need to turn them back on here. */
-static int __maybe_unused inv_icm42600_runtime_resume(struct device *dev)
+static int inv_icm42600_runtime_resume(struct device *dev)
 {
 	struct inv_icm42600_state *st = dev_get_drvdata(dev);
 	int ret;
@@ -774,12 +774,11 @@ static int __maybe_unused inv_icm42600_runtime_resume(struct device *dev)
 	return ret;
 }
 
-const struct dev_pm_ops inv_icm42600_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(inv_icm42600_suspend, inv_icm42600_resume)
-	SET_RUNTIME_PM_OPS(inv_icm42600_runtime_suspend,
-			   inv_icm42600_runtime_resume, NULL)
+EXPORT_NS_GPL_DEV_PM_OPS(inv_icm42600_pm_ops, IIO_ICM42600) = {
+	SYSTEM_SLEEP_PM_OPS(inv_icm42600_suspend, inv_icm42600_resume)
+	RUNTIME_PM_OPS(inv_icm42600_runtime_suspend,
+		       inv_icm42600_runtime_resume, NULL)
 };
-EXPORT_SYMBOL_GPL(inv_icm42600_pm_ops);
 
 MODULE_AUTHOR("InvenSense, Inc.");
 MODULE_DESCRIPTION("InvenSense ICM-426xx device driver");

drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c

@@ -93,7 +93,7 @@ static struct i2c_driver inv_icm42600_driver = {
 	.driver = {
 		.name = "inv-icm42600-i2c",
 		.of_match_table = inv_icm42600_of_matches,
-		.pm = &inv_icm42600_pm_ops,
+		.pm = pm_ptr(&inv_icm42600_pm_ops),
 	},
 	.probe_new = inv_icm42600_probe,
 };
@@ -102,3 +102,4 @@ module_i2c_driver(inv_icm42600_driver);
 MODULE_AUTHOR("InvenSense, Inc.");
 MODULE_DESCRIPTION("InvenSense ICM-426xx I2C driver");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_ICM42600);

drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c

@@ -89,7 +89,7 @@ static struct spi_driver inv_icm42600_driver = {
 	.driver = {
 		.name = "inv-icm42600-spi",
 		.of_match_table = inv_icm42600_of_matches,
-		.pm = &inv_icm42600_pm_ops,
+		.pm = pm_ptr(&inv_icm42600_pm_ops),
 	},
 	.probe = inv_icm42600_probe,
 };
@@ -98,3 +98,4 @@ module_spi_driver(inv_icm42600_driver);
 MODULE_AUTHOR("InvenSense, Inc.");
 MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_ICM42600);