drivers: sensor: tdk: icm42x70: update temperature data processing

Update the temperature data processing to
handle different data sizes based on FIFO configuration.
The temperature sensor data size and conversion
formula vary depending on the FIFO mode:
1. FIFO disabled: Uses 20-bit data format
2. FIFO enabled (standard resolution): 16-bit data
3. FIFO enabled (high resolution): 20-bit data

The implementation now:
- Uses the 'fifo_highres_enabled' flag
  to determine the correct data size
- Applies the appropriate conversion formula
  based on the resolution mode
- Handles all three possible FIFO configurations
- Ensures accurate temperature readings in all modes

Signed-off-by: Shreehari HK <[email protected]>

Author: Shreehari-AlifSemi

drivers/sensor/tdk/icm42x70/icm42x70.c

@@ -482,12 +482,17 @@ static void icm42x70_convert_accel(struct sensor_value *val, int16_t raw_val, ui
 	val->val2 = conv_val % 1000000;
 }
 
-static void icm42x70_convert_temp(struct sensor_value *val, int16_t raw_val)
+static void icm42x70_convert_temp(struct sensor_value *val, int16_t raw_val, bool hires)
 {
 	int64_t conv_val;
 
 	/* see datasheet section 15.9 for details */
-	conv_val = 25 * 1000000 + ((int64_t)raw_val * 1000000 / 2);
+	if (hires) {
+		conv_val = (25 * 1000000) + ((int64_t)raw_val * 1000000 / 128);
+	} else {
+		conv_val = (25 * 1000000) + ((int64_t)raw_val * 1000000 / 2);
+	}
+
 	val->val1 = conv_val / 1000000;
 	val->val2 = conv_val % 1000000;
 }
@@ -530,7 +535,17 @@ static int icm42x70_channel_get(const struct device *dev, enum sensor_channel ch
 		icm42670_convert_gyro(val, data->gyro_z, data->gyro_fs);
 #endif
 	} else if (chan == SENSOR_CHAN_DIE_TEMP) {
-		icm42x70_convert_temp(val, data->temp);
+
+	/* see datasheet section 15.9 for details */
+#ifdef CONFIG_ICM42X70_TRIGGER
+		icm42x70_convert_temp(val, data->temp, data->driver.fifo_highres_enabled);
+#else
+		/* The temperature data read in non-fifo mode is of 2-bytes;
+		 * which is same as FIFO with high resolution temp data.
+		 */
+		icm42x70_convert_temp(val, data->temp, true);
+#endif
+
 #ifdef CONFIG_TDK_APEX
 	} else if ((enum sensor_channel_tdk_apex)chan == SENSOR_CHAN_APEX_MOTION) {
 		if (cfg->apex == TDK_APEX_PEDOMETER) {