[PATCH 2/3] i2c: ibm_iic: get the irq early in probe

[Rosen Penev]

platform_get_irq() can return -EPROBE_DEFER, unlike
irq_of_map_and_parse(), which helps reduce work done during probe.

Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/i2c/busses/i2c-ibm_iic.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c
index 043cb64a2544..2730c8410167 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.c
+++ b/drivers/i2c/busses/i2c-ibm_iic.c
@@ -649,20 +649,11 @@ static inline u8 iic_clckdiv(unsigned int opb)
 }
 
 static int iic_request_irq(struct platform_device *ofdev,
-				     struct ibm_iic_private *dev)
+			     struct ibm_iic_private *dev, int irq)
 {
-	struct device_node *np = ofdev->dev.of_node;
-	int irq;
-
 	if (iic_force_poll)
 		return 0;
 
-	irq = irq_of_parse_and_map(np, 0);
-	if (!irq) {
-		dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n");
-		return 0;
-	}
-
 	/* Disable interrupts until we finish initialization, assumes
 	 *  level-sensitive IRQ setup...
 	 */
@@ -686,12 +677,19 @@ static int iic_probe(struct platform_device *ofdev)
 	struct i2c_adapter *adap;
 	void __iomem *vaddr;
 	const u32 *freq;
+	int irq;
 	int ret;
 
 	vaddr = devm_platform_ioremap_resource(ofdev, 0);
 	if (IS_ERR(vaddr))
 		return PTR_ERR(vaddr);
 
+	irq = platform_get_irq(ofdev, 0);
+	if (irq == -EPROBE_DEFER)
+		return irq;
+	if (irq < 0)
+		dev_warn(&ofdev->dev, "using polling mode\n");
+
 	dev = kzalloc_obj(*dev);
 	if (!dev)
 		return -ENOMEM;
@@ -702,9 +700,8 @@ static int iic_probe(struct platform_device *ofdev)
 
 	init_waitqueue_head(&dev->wq);
 
-	dev->irq = iic_request_irq(ofdev, dev);
-	if (!dev->irq)
-		dev_warn(&ofdev->dev, "using polling mode\n");
+	if (irq > 0)
+		dev->irq = iic_request_irq(ofdev, dev, irq);
 
 	/* Board specific settings */
 	if (iic_force_fast || of_get_property(np, "fast-mode", NULL))
-- 
2.55.0