iio:health:max30102: Drop of_match_ptr and use generic fw accessors

This enables use of the driver with ACPI PRP0001 and also removes
an antipattern that I am trying to clear out of IIO to avoid
it being copied into new drivers.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Link: https://lore.kernel.org/r/20200910173242.621168-39-jic23@kernel.org

drivers/iio/health/max30102.c

@@ -19,7 +19,7 @@
 #include <linux/irq.h>
 #include <linux/i2c.h>
 #include <linux/mutex.h>
-#include <linux/of.h>
+#include <linux/mod_devicetable.h>
 #include <linux/regmap.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/buffer.h>
@@ -323,11 +323,10 @@ static int max30102_get_current_idx(unsigned int val, int *reg)
 static int max30102_led_init(struct max30102_data *data)
 {
 	struct device *dev = &data->client->dev;
-	struct device_node *np = dev->of_node;
 	unsigned int val;
 	int reg, ret;
 
-	ret = of_property_read_u32(np, "maxim,red-led-current-microamp", &val);
+	ret = device_property_read_u32(dev, "maxim,red-led-current-microamp", &val);
 	if (ret) {
 		dev_info(dev, "no red-led-current-microamp set\n");
 
@@ -346,7 +345,7 @@ static int max30102_led_init(struct max30102_data *data)
 		return ret;
 
 	if (data->chip_id == max30105) {
-		ret = of_property_read_u32(np,
+		ret = device_property_read_u32(dev,
 			"maxim,green-led-current-microamp", &val);
 		if (ret) {
 			dev_info(dev, "no green-led-current-microamp set\n");
@@ -368,7 +367,7 @@ static int max30102_led_init(struct max30102_data *data)
 			return ret;
 	}
 
-	ret = of_property_read_u32(np, "maxim,ir-led-current-microamp", &val);
+	ret = device_property_read_u32(dev, "maxim,ir-led-current-microamp", &val);
 	if (ret) {
 		dev_info(dev, "no ir-led-current-microamp set\n");
 
@@ -624,7 +623,7 @@ MODULE_DEVICE_TABLE(of, max30102_dt_ids);
 static struct i2c_driver max30102_driver = {
 	.driver = {
 		.name	= MAX30102_DRV_NAME,
-		.of_match_table	= of_match_ptr(max30102_dt_ids),
+		.of_match_table	= max30102_dt_ids,
 	},
 	.probe		= max30102_probe,
 	.remove		= max30102_remove,