i2c: brcmstb: The interrupt line is optional, so use platform_get_irq_optional

If there is no interrupt defined then an error is logged due
to the use of platform_get_irq. The driver handles not having
the interrupt by falling back to polling, therefore make
the appropriate call when claiming it.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/i2c/busses/i2c-brcmstb.c b/drivers/i2c/busses/i2c-brcmstb.c
index 169a283..d4e0a0f 100644 (file)
--- a/drivers/i2c/busses/i2c-brcmstb.c
+++ b/drivers/i2c/busses/i2c-brcmstb.c
@@ -647,20 +647,22 @@ static int brcmstb_i2c_probe(struct platform_device *pdev)
                int_name = NULL;
 
        /* Get the interrupt number */
-       dev->irq = platform_get_irq(pdev, 0);
+       dev->irq = platform_get_irq_optional(pdev, 0);
 
        /* disable the bsc interrupt line */
        brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE);
 
        /* register the ISR handler */
-       rc = devm_request_irq(&pdev->dev, dev->irq, brcmstb_i2c_isr,
-                             IRQF_SHARED,
-                             int_name ? int_name : pdev->name,
-                             dev);
-
-       if (rc) {
-               dev_dbg(dev->device, "falling back to polling mode");
-               dev->irq = -1;
+       if (dev->irq >= 0) {
+               rc = devm_request_irq(&pdev->dev, dev->irq, brcmstb_i2c_isr,
+                                     IRQF_SHARED,
+                                     int_name ? int_name : pdev->name,
+                                     dev);
+
+               if (rc) {
+                       dev_dbg(dev->device, "falling back to polling mode");
+                       dev->irq = -1;
+               }
        }
 
        if (of_property_read_u32(dev->device->of_node,