iio: humidity: hts221: Use EXPORT_SIMPLE_DEV_PM_OPS() to allow compiler to remove dead code.

If CONFIG_PM_SLEEP is not defined using EXPORT_SIMPLE_DEV_PM_OPS()
in conjunction with pm_sleep_ptr() allows the compiler to remove
the unused code and data. This removes the need for __maybe_unused
markings etc.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/20220220181522.541718-6-jic23@kernel.orgAcked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/20220604161223.461847-3-jic23@kernel.org

drivers/iio/humidity/hts221_core.c

@@ -670,7 +670,7 @@ int hts221_probe(struct device *dev, int irq, const char *name,
 }
 EXPORT_SYMBOL(hts221_probe);
 
-static int __maybe_unused hts221_suspend(struct device *dev)
+static int hts221_suspend(struct device *dev)
 {
 	struct iio_dev *iio_dev = dev_get_drvdata(dev);
 	struct hts221_hw *hw = iio_priv(iio_dev);
@@ -680,7 +680,7 @@ static int __maybe_unused hts221_suspend(struct device *dev)
 				  FIELD_PREP(HTS221_ENABLE_MASK, false));
 }
 
-static int __maybe_unused hts221_resume(struct device *dev)
+static int hts221_resume(struct device *dev)
 {
 	struct iio_dev *iio_dev = dev_get_drvdata(dev);
 	struct hts221_hw *hw = iio_priv(iio_dev);
@@ -694,10 +694,7 @@ static int __maybe_unused hts221_resume(struct device *dev)
 	return err;
 }
 
-const struct dev_pm_ops hts221_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(hts221_suspend, hts221_resume)
-};
-EXPORT_SYMBOL(hts221_pm_ops);
+EXPORT_SIMPLE_DEV_PM_OPS(hts221_pm_ops, hts221_suspend, hts221_resume);
 
 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
 MODULE_DESCRIPTION("STMicroelectronics hts221 sensor driver");

drivers/iio/humidity/hts221_i2c.c

@@ -62,7 +62,7 @@ MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
 static struct i2c_driver hts221_driver = {
 	.driver = {
 		.name = "hts221_i2c",
-		.pm = &hts221_pm_ops,
+		.pm = pm_sleep_ptr(&hts221_pm_ops),
 		.of_match_table = hts221_i2c_of_match,
 		.acpi_match_table = ACPI_PTR(hts221_acpi_match),
 	},

drivers/iio/humidity/hts221_spi.c

@@ -55,7 +55,7 @@ MODULE_DEVICE_TABLE(spi, hts221_spi_id_table);
 static struct spi_driver hts221_driver = {
 	.driver = {
 		.name = "hts221_spi",
-		.pm = &hts221_pm_ops,
+		.pm = pm_sleep_ptr(&hts221_pm_ops),
 		.of_match_table = hts221_spi_of_match,
 	},
 	.probe = hts221_spi_probe,