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

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Message-ID: <1BAFE6F6C881BF42822005164F1491C33EC34679@DBDE04.ent.ti.com>
Date:	Thu, 13 Jun 2013 09:39:54 +0000
From:	"Hebbar, Gururaja" <gururaja.hebbar@...com>
To:	Kevin Hilman <khilman@...aro.org>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"zonque@...il.com" <zonque@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"a.zummo@...ertech.it" <a.zummo@...ertech.it>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"Bedia, Vaibhav" <vaibhav.bedia@...com>,
	"Rajashekhara, Sudhakar" <sudhakar.raj@...com>
Subject: RE: [PATCH 2/2] rtc: omap: add rtc wakeup support to alarm events

Hi Kevin,

On Mon, Jun 10, 2013 at 16:55:17, Hebbar, Gururaja wrote:
> On Fri, May 31, 2013 at 23:11:22, Kevin Hilman wrote:
> > Hebbar Gururaja <gururaja.hebbar@...com> 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
>    9e0344dcc225fe1a0e8b8af9ff7df44ec4613580)
> 
> 
> 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
> 
> or
> 
> b. use dt property to indicate existence of above property.
> 
> 
> Kindly let me know your opinion about the same.

Any update on this. I have patch ready for both the choices. Waiting for your ok to send


> 
> > 
> > Kevin
> > 
> 
> 
> Regards, 
> Gururaja
> 


Regards, 
Gururaja
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