linux-kernel - Re: [PATCH 1/5] ARM: at91: at91sam9x5 RTC is not compatible with at91rm9200 one

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Date:	Fri, 19 Apr 2013 18:49:44 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	linux-kernel@...r.kernel.org, tanzilli@...esystems.it,
	dgilbert@...erlog.com, robertcnelson@...il.com
Subject: Re: [PATCH 1/5] ARM: at91: at91sam9x5 RTC is not compatible with
 at91rm9200 one

On 19-04-2013 18:05, Nicolas Ferre wrote:

>>> Due to a bug with RTC IMR, we cannot consider at91sam9x5 RTC compatible
>>> with the previous one. Modify DT compatibility string, even if the driver
>>> is not yet modified to take it into account.

>>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
>>> ---
>>>    arch/arm/boot/dts/at91sam9x5.dtsi | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)

>>> diff --git a/arch/arm/boot/dts/at91sam9x5.dtsi
>>> b/arch/arm/boot/dts/at91sam9x5.dtsi
>>> index a3d4464..58747f3 100644
>>> --- a/arch/arm/boot/dts/at91sam9x5.dtsi
>>> +++ b/arch/arm/boot/dts/at91sam9x5.dtsi
>>> @@ -564,7 +564,7 @@
>>>                };
>>>
>>>                rtc@...ffeb0 {
>>> -                compatible = "atmel,at91rm9200-rtc";
>>> +                compatible = "atmel,at91sam9x5-rtc";

>>     Do not use wildcards in the "compatible" prop values (I guess 'x' is
>> a wildcard).

> Well, it is for naming a series of hardware, not for giving a generic
> name that could cover different hardware.

> In the sense of Atmel it is our way to call the at91sam9x5 series of
> SoC: you will see that the code that covers these SoCs is always named
> like this.
> In fact, the hardware contained in these SoC cannot be different from
> one flavor of the family to the other.

    Nevertheless, the wildcards shouldn't be used. Use the name of e.g. the 
first member of the family.

> Best regards,

WBR, Sergei

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