rtc: pl031: make interrupt optional

On some platforms, the interrupt for the PL031 is optional.  Avoid
trying to claim the interrupt if it's not specified.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
index 64c77ec1b4ea..82eb7da2c478 100644
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -308,7 +308,8 @@ static int pl031_remove(struct amba_device *adev)
 
         dev_pm_clear_wake_irq(&adev->dev);
         device_init_wakeup(&adev->dev, false);
-        free_irq(adev->irq[0], ldata);
+        if (adev->irq[0])
+                free_irq(adev->irq[0], ldata);
         rtc_device_unregister(ldata->rtc);
         amba_release_regions(adev);
 
@@ -389,12 +390,13 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
                 goto out;
         }
 
-        if (request_irq(adev->irq[0], pl031_interrupt,
-                        vendor->irqflags, "rtc-pl031", ldata)) {
-                ret = -EIO;
-                goto out_no_irq;
+        if (adev->irq[0]) {
+                ret = request_irq(adev->irq[0], pl031_interrupt,
+                                  vendor->irqflags, "rtc-pl031", ldata);
+                if (ret)
+                        goto out_no_irq;
+                dev_pm_set_wake_irq(&adev->dev, adev->irq[0]);
         }
-        dev_pm_set_wake_irq(&adev->dev, adev->irq[0]);
         return 0;
 
 out_no_irq: