linux-kernel - Re: [PATCH v3 5/7] riscv: Kconfig.socs: Allow SOC

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Date: Wed, 6 Mar 2024 08:58:49 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Conor Dooley <conor@...nel.org>, Yangyu Chen <cyy@...self.name>
Cc: linux-riscv@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Guo Ren <guoren@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v3 5/7] riscv: Kconfig.socs: Allow SOC_CANAAN with MMU for
 K230

On 3/6/24 02:20, Conor Dooley wrote:
> On Tue, Mar 05, 2024 at 03:47:15PM +0800, Yangyu Chen wrote:
>> On 2024/3/5 07:46, Damien Le Moal wrote:
>>> On 3/5/24 06:05, Yangyu Chen wrote:
>>>> Since K230 was released, SOC_CANAAN is no longer only referred to the K210.
>>>> Remove it depends on !MMU will allow building dts for K230 and remove the
>>>> K210 string from the help message.
>>>>
>>>> Signed-off-by: Yangyu Chen <cyy@...self.name>
>>>> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>>>> ---
>>>>   arch/riscv/Kconfig.socs | 5 ++---
>>>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
>>>> index 623de5f8a208..b4e9b7f75510 100644
>>>> --- a/arch/riscv/Kconfig.socs
>>>> +++ b/arch/riscv/Kconfig.socs
>>>> @@ -75,13 +75,12 @@ config ARCH_CANAAN
>>>>   	def_bool SOC_CANAAN
>>>>   config SOC_CANAAN
>>>> -	bool "Canaan Kendryte K210 SoC"
>>>> -	depends on !MMU
>>>
>>> This seems wrong to me. The k210 support does require no-mmu. So why remove
>>> this ?
>>
>> It just allows SOC_CANAAN to be selected when MMU=y. With this patch,
>> nommu_k210_defconfig still works.
> 
> I think the concern here is that this would allow people to build a
> kernel for the k120 with the MMU enabled, not that the existing nommu
> build will be affected.

Yes, this is my concern. Apologies for the lack of clarity.

> 
> Maybe you could squash in something like the following?
> 
> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> index b4e9b7f75510..75d55059163f 100644
> --- a/arch/riscv/Kconfig.socs
> +++ b/arch/riscv/Kconfig.socs
> @@ -72,15 +72,19 @@ config SOC_VIRT
>  	  This enables support for QEMU Virt Machine.
>  
>  config ARCH_CANAAN
> -	def_bool SOC_CANAAN
> +	bool "Canaan Kendryte SoCs"
> +	help
> +	  This enables support for Canaan Kendryte SoC platform hardware.
>  
>  config SOC_CANAAN
> -	bool "Canaan Kendryte SoC"
> +	bool "Canaan Kendryte K210 SoC"
> +	depends on !MMU
> +	depends on ARCH_CANAAN
>  	select CLINT_TIMER if RISCV_M_MODE
>  	select ARCH_HAS_RESET_CONTROLLER
>  	select PINCTRL
>  	select COMMON_CLK
>  	help
> -	  This enables support for Canaan Kendryte SoC platform hardware.
> +	  This enables support for Canaan Kendryte K210 SoC platform hardware.
>  
>  endmenu # "SoC selection"
> 
> (Which reminds me, I really need to go and finish sorting out the ARCH_
> stuff)

-- 
Damien Le Moal
Western Digital Research