Received-SPF: pass (google.com: domain of linux-kernel+bounces-93131-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Message-ID: <311bdf17-c16f-41d8-8366-10f9b00adf27@kernel.org>
Date: Wed, 6 Mar 2024 08:58:49 +0900
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v3 5/7] riscv: Kconfig.socs: Allow SOC_CANAAN with MMU for
 K230
To: Conor Dooley <conor@kernel.org>, Yangyu Chen <cyy@cyyself.name>
Cc: linux-riscv@lists.infradead.org, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt
 <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>,
 Guo Ren <guoren@kernel.org>, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Conor Dooley <conor.dooley@microchip.com>
References: <tencent_BB2364BBF1812F4E304F7BDDD11E57356605@qq.com>
 <tencent_0432DA968E39B81431F921F38D747C008208@qq.com>
 <ef8df22f-dac8-4652-bf17-d10254e6abfb@kernel.org>
 <tencent_E56A833916E00EC7B4840C34FAF1250ADE0A@qq.com>
 <20240305-fascism-enrich-06483ddeb149@spud>
Content-Language: en-US
From: Damien Le Moal <dlemoal@kernel.org>
Organization: Western Digital Research
In-Reply-To: <20240305-fascism-enrich-06483ddeb149@spud>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

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@cyyself.name>
>>>> Reviewed-by: Conor Dooley <conor.dooley@microchip.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