RE: [PATCH 2/2] rtc: omap: add rtc wakeup support to alarm events

From: Hebbar, Gururaja
Date: Mon Jun 10 2013 - 07:27:01 EST

On Fri, May 31, 2013 at 23:11:22, Kevin Hilman wrote:
> Hebbar Gururaja <gururaja.hebbar@xxxxxx> writes:
> > On some platforms (like AM33xx), a special register (RTC_IRQWAKEEN)
> > is available to enable Wakeup feature for Alarm Events.
> >
> > Since new platforms/Boards are now added through DT only, this feature
> > is supported via DT property only.
> > Platforms using such IP should add the property "ti,has_irq_wake_enb"
> > in rtc DT node.
> This is a property of the IP, not the board. Can't you detect this
> based on the revision of the IP?

Here is what I found out till now.

1. rtc-omap driver is used by Davinci, OMAP-1/2 & AM33xx SoC.

2. Only AM33xx soc rtc ip has revision register (& populated). Older OMAP
Or davinci doesn't have this register.

3. AFAIK, this was the reason why Afzal used platform_device_id &
of_device_id->data method to detect new versions (commit

So now either
a. I can follow the same method and add new member to omap_rtc_devtype & add a new compatible in
omap_rtc_of_match in rtc-omap.c


b. use dt property to indicate existence of above property.

Kindly let me know your opinion about the same.

> Kevin

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at