iio: trigger: stm32-lptimer-trigger: Make use of device properties

Convert the module to be property provider agnostic and allow
it to be used on non-OF platforms.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220413185656.21994-1-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/trigger/stm32-lptimer-trigger.c

@@ -13,6 +13,7 @@
 #include <linux/mfd/stm32-lptimer.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 
 /* List Low-Power Timer triggers */
 static const char * const stm32_lptim_triggers[] = {
@@ -77,7 +78,7 @@ static int stm32_lptim_trigger_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
+	if (device_property_read_u32(&pdev->dev, "reg", &index))
 		return -EINVAL;
 
 	if (index >= ARRAY_SIZE(stm32_lptim_triggers))