mfd: mt6397: Trim probe function to support different chips more cleanly

Add new struct members for mfd-cells and irq initial function, so we can
call devm_mfd_add_devices() only once.
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/mt6397-core.c

@@ -103,22 +103,31 @@ static const struct mfd_cell mt6397_devs[] = {
 struct chip_data {
 	u32 cid_addr;
 	u32 cid_shift;
+	const struct mfd_cell *cells;
+	int cell_size;
+	int (*irq_init)(struct mt6397_chip *chip);
 };
 
 static const struct chip_data mt6323_core = {
 	.cid_addr = MT6323_CID,
 	.cid_shift = 0,
+	.cells = mt6323_devs,
+	.cell_size = ARRAY_SIZE(mt6323_devs),
+	.irq_init = mt6397_irq_init,
 };
 
 static const struct chip_data mt6397_core = {
 	.cid_addr = MT6397_CID,
 	.cid_shift = 0,
+	.cells = mt6397_devs,
+	.cell_size = ARRAY_SIZE(mt6397_devs),
+	.irq_init = mt6397_irq_init,
 };
 
 static int mt6397_probe(struct platform_device *pdev)
 {
 	int ret;
-	unsigned int id;
+	unsigned int id = 0;
 	struct mt6397_chip *pmic;
 	const struct chip_data *pmic_core;
 
@@ -154,29 +163,13 @@ static int mt6397_probe(struct platform_device *pdev)
 	if (pmic->irq <= 0)
 		return pmic->irq;
 
-	ret = mt6397_irq_init(pmic);
+	ret = pmic_core->irq_init(pmic);
 	if (ret)
 		return ret;
 
-	switch (pmic->chip_id) {
-	case MT6323_CHIP_ID:
-		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, PLATFORM_DEVID_NONE,
-					   mt6397_devs, ARRAY_SIZE(mt6397_devs),
-					   NULL, 0, pmic->irq_domain);
-		break;
-
-	default:
-		dev_err(&pdev->dev, "unsupported chip: %d\n", pmic->chip_id);
-		return -ENODEV;
-	}
-
+	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+				   pmic_core->cells, pmic_core->cell_size,
+				   NULL, 0, pmic->irq_domain);
 	if (ret) {
 		irq_domain_remove(pmic->irq_domain);
 		dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);