Re: [PATCH] ARM: Kconfig: improve ARM_SINGLE_ARMV7M description with Cortex M7

From: Giulio Benetti <giulio.benetti@benettiengineering.com>
To: Vladimir Murzin <vladimir.murzin@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: "Russell King" <linux@armlinux.org.uk>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
	"Ard Biesheuvel" <ardb@kernel.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Anshuman Khandual" <anshuman.khandual@arm.com>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Lukas Bulwahn" <lukas.bulwahn@gmail.com>
Subject: Re: [PATCH] ARM: Kconfig: improve ARM_SINGLE_ARMV7M description with Cortex M7
Date: Fri, 3 Dec 2021 17:41:28 +0100	[thread overview]
Message-ID: <170aea55-44f3-9cf0-fd88-adf8c66efeb4@benettiengineering.com> (raw)
In-Reply-To: <db427a15-231b-957e-3690-73373fec55ea@arm.com>

Hi Vladimir,

On 03/12/21 10:30, Vladimir Murzin wrote:
> On 12/2/21 10:20 PM, Giulio Benetti wrote:
>> ARM_SINGLE_ARMV7M implies Arm Cortex M7 too, so let's add it to
>> description with M0/M3/M4.
> 
> Well it also implies M33 and M55. I'd suggest drop specific implementations
> from description - so we do not need to update it each time new compatible
> core is released. To account newest cores like M33 and M55 you can rephrase
> to:
> - ARMv7-M/v8-M

This ^^^ is ok for me. Also, I don't see any M0 used at the moment so no 
ARMv6-M makes sense, if any in the future we can update. I see M3,M4,M7 
for the moment, so ARMv7-M. But at the moment no ARMv8-M, or am I wrong?
Maybe it would be better to add ARMv8-M when there will really be the 
support, considering also that ARM_SINGLE_ARMV7M is a bit ambiguous to 
be used with ARMv8-M. So maybe that could be modified too when an 
ARMv8-M is added.

What do you think about this?

Best regards
-- 
Giulio Benetti
Benetti Engineering sas

> - ARMv7-M and above
> 
> Cheers
> Vladimir
> 
>>
>> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
>> ---
>>   arch/arm/Kconfig | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index c2724d986fa0..67efbde70e34 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -329,7 +329,7 @@ config ARCH_MULTIPLATFORM
>>   	select USE_OF
>>   
>>   config ARM_SINGLE_ARMV7M
>> -	bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
>> +	bool "ARMv7-M based platforms (Cortex-M0/M3/M4/M7)"
>>   	depends on !MMU
>>   	select ARM_NVIC
>>   	select AUTO_ZRELADDR
>>
> 

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