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rtc: pl031: avoid exposing alarm if no interrupt 

If the RTC has no interrupt, there is little point in exposing the RTC
alarm capabilities, as it can't be used as a wakeup source nor can it
deliver an event to userspace.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Russell King 2017-09-29 11:22:10 +01:00 committed by Alexandre Belloni
parent 273c868e85
commit b86f581f8c
1 changed files with 12 additions and 3 deletions
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15
drivers/rtc/rtc-pl031.c
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@ -320,7 +320,7 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
int ret;
struct pl031_local *ldata;
struct pl031_vendor_data *vendor = id->data;
struct rtc_class_ops *ops = &vendor->ops;
struct rtc_class_ops *ops;
unsigned long time, data;
ret = amba_request_regions(adev, NULL);
@ -329,12 +329,14 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
ldata = devm_kzalloc(&adev->dev, sizeof(struct pl031_local),
GFP_KERNEL);
if (!ldata) {
ops = devm_kmemdup(&adev->dev, &vendor->ops, sizeof(vendor->ops),
GFP_KERNEL);
if (!ldata || !ops) {
ret = -ENOMEM;
goto out;
}
ldata->vendor = vendor;
ldata->vendor = vendor;
ldata->base = devm_ioremap(&adev->dev, adev->res.start,
resource_size(&adev->res));
if (!ldata->base) {
@ -372,6 +374,13 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
}
}
if (!adev->irq[0]) {
/* When there's no interrupt, no point in exposing the alarm */
ops->read_alarm = NULL;
ops->set_alarm = NULL;
ops->alarm_irq_enable = NULL;
}
device_init_wakeup(&adev->dev, true);
ldata->rtc = rtc_device_register("pl031", &adev->dev, ops,
THIS_MODULE);