mfd: mt6397: Use PLATFORM_DEVID_NONE macro instead of -1

Use the correct macro when adding the MFD devices instead of using
directly '-1' value.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/mt6397-core.c

@@ -189,16 +189,16 @@ static int mt6397_probe(struct platform_device *pdev)
 
 	switch (pmic->chip_id) {
 	case MT6323_CHIP_ID:
-		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6323_devs,
-					   ARRAY_SIZE(mt6323_devs), NULL,
-					   0, pmic->irq_domain);
+		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+					   mt6323_devs, ARRAY_SIZE(mt6323_devs),
+					   NULL, 0, pmic->irq_domain);
 		break;
 
 	case MT6391_CHIP_ID:
 	case MT6397_CHIP_ID:
-		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6397_devs,
-					   ARRAY_SIZE(mt6397_devs), NULL,
-					   0, pmic->irq_domain);
+		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+					   mt6397_devs, ARRAY_SIZE(mt6397_devs),
+					   NULL, 0, pmic->irq_domain);
 		break;
 
 	default: