[PATCH v2 1/3] mfd: mt6397: irq domain should initialize before mfd_add_devices()

[Henry Chen]

Some sub driver like RTC module need irq domain from parent to create
irq mapping when driver initialize. so move mt6397_irq_init() before
mfd_add_devices().

Acked-by: John Crispin <blogic@xxxxxxxxxxx>
Signed-off-by: Henry Chen <henryc.chen@xxxxxxxxxxxx>
---
This series fixed the below warning based on "Linux kernel v4.6-rc1"
WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
irq_create_mapping+0xc4/0xd0

Changes in V2: Add two patch for error handle checking.
---
 drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
index 8e8d932..a879223 100644
--- a/drivers/mfd/mt6397-core.c
+++ b/drivers/mfd/mt6397-core.c
@@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
 		goto fail_irq;
 	}
 
+	pmic->irq = platform_get_irq(pdev, 0);
+
 	switch (id & 0xff) {
 	case MT6323_CID_CODE:
-		pmic->int_con[0] = MT6323_INT_CON0;
-		pmic->int_con[1] = MT6323_INT_CON1;
-		pmic->int_status[0] = MT6323_INT_STATUS0;
-		pmic->int_status[1] = MT6323_INT_STATUS1;
+		if (pmic->irq > 0) {
+			pmic->int_con[0] = MT6323_INT_CON0;
+			pmic->int_con[1] = MT6323_INT_CON1;
+			pmic->int_status[0] = MT6323_INT_STATUS0;
+			pmic->int_status[1] = MT6323_INT_STATUS1;
+			ret = mt6397_irq_init(pmic);
+			if (ret)
+				return ret;
+		}
+
 		ret = mfd_add_devices(&pdev->dev, -1, mt6323_devs,
 				ARRAY_SIZE(mt6323_devs), NULL, 0, NULL);
 		break;
 
 	case MT6397_CID_CODE:
 	case MT6391_CID_CODE:
-		pmic->int_con[0] = MT6397_INT_CON0;
-		pmic->int_con[1] = MT6397_INT_CON1;
-		pmic->int_status[0] = MT6397_INT_STATUS0;
-		pmic->int_status[1] = MT6397_INT_STATUS1;
+		if (pmic->irq > 0) {
+			pmic->int_con[0] = MT6397_INT_CON0;
+			pmic->int_con[1] = MT6397_INT_CON1;
+			pmic->int_status[0] = MT6397_INT_STATUS0;
+			pmic->int_status[1] = MT6397_INT_STATUS1;
+			ret = mt6397_irq_init(pmic);
+			if (ret)
+				return ret;
+		}
+
 		ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
 				ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
 		break;
@@ -296,13 +310,6 @@ static int mt6397_probe(struct platform_device *pdev)
 		break;
 	}
 
-	pmic->irq = platform_get_irq(pdev, 0);
-	if (pmic->irq > 0) {
-		ret = mt6397_irq_init(pmic);
-		if (ret)
-			return ret;
-	}
-
 fail_irq:
 	if (ret) {
 		irq_domain_remove(pmic->irq_domain);
-- 
1.8.1.1.dirty