linux-kernel - Re: [Patch V2 4/4] ARM: dts: AM33XX: update rtc node compatibility

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Date:	Tue, 30 Jul 2013 21:51:14 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Mark Rutland <mark.rutland@....com>
CC:	Gururaja Hebbar <gururaja.hebbar@...com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"tony@...mide.com" <tony@...mide.com>,
	"benoit.cousson@...il.com" <benoit.cousson@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vaibhav.bedia@...com" <vaibhav.bedia@...com>,
	"benoit.cousson@...aro.org" <benoit.cousson@...aro.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Patch V2 4/4] ARM: dts: AM33XX: update rtc node compatibility

On 7/30/2013 8:25 PM, Mark Rutland wrote:
> On Tue, Jul 30, 2013 at 06:05:52AM +0100, Gururaja Hebbar wrote:
>> Hi,
>>
>> On 7/3/2013 2:17 PM, Hebbar Gururaja wrote:
>>> Since AM33xx  RTC IP has RTC_IRQWAKEEN to support Alarm Wake-up.
>>>
>>> Update the rtc compatible property to "ti,am3352-rtc" to enable handling
>>> of this feature inside rtc-omap driver.
>>
>> The other 2 rtc driver related patches have been pulled up. If you have 
>> no comments, can you please pull this up.
>>
>> Regards
>> Gururaja
>>
>>>
>>> Signed-off-by: Hebbar Gururaja <gururaja.hebbar@...com>
>>> ---
>>> :100644 100644 77aa1b0... dde180a... M	arch/arm/boot/dts/am33xx.dtsi
>>>   arch/arm/boot/dts/am33xx.dtsi |    2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
>>> index 77aa1b0..dde180a 100644
>>> --- a/arch/arm/boot/dts/am33xx.dtsi
>>> +++ b/arch/arm/boot/dts/am33xx.dtsi
>>> @@ -297,7 +297,7 @@
>>>   		};
>>>
>>>   		rtc@...3e000 {
>>> -			compatible = "ti,da830-rtc";
>>> +			compatible = "ti,am3352-rtc";
> 
> Given that this is backwards compatible with the old binding, it would
> be nicer to have this as:
> 
> 	compatible = "ti,am3352-rtc", "ti,da830-rtc";
> 
> We must get into the habit of changing dts files in a
> backwards-compatible fashion.

Right, I suggested this when v1 was posted. It turns out the current
kernel does not handle the compatilble list correctly and the string
selected actually depends on the order in which it appears in match
table in driver instead.

I saw there were patches being discussed to fix this issue, but until
that is fixed, we cannot really use what you (and I before) suggested.

Thanks,
Sekhar
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