linux-kernel - Re: [PATCH v3 0/3] Add RISC-V 32 NOMMU support

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Date:   Tue, 7 Mar 2023 19:51:39 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Jesse Taube <mr.bossman075@...il.com>,
        linux-riscv@...ts.infradead.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yimin Gu <ustcymgu@...il.com>,
        Damien Le Moal <damien.lemoal@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Waldemar Brodkorb <wbx@...nadk.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: [PATCH v3 0/3] Add RISC-V 32 NOMMU support



On 3/7/23 19:42, Damien Le Moal wrote:
> On 3/8/23 12:23, Randy Dunlap wrote:
>>>> OK, I don't know how it happened. I cannot reproduce it now.
>>>> The failing .config files has CONFIG_MMU is not set (for RV32I), which
>>>> appears to be impossible.
>>> These patches add `CONFIG_MMU is not set` (for RV32I).
>>> But no worries it seems to be a non issue  now.
>>>
>>> Your thoughts Damien?
>>>
>>
>> Thanks for reminding me.
>>
>> With these 3 patches applied to linux-next-20230307,
>> I still get this build error.
> 
> Does this help ?
> 
> diff --git a/drivers/soc/canaan/Kconfig b/drivers/soc/canaan/Kconfig
> index 2527cf5757ec..7796c5f1d109 100644
> --- a/drivers/soc/canaan/Kconfig
> +++ b/drivers/soc/canaan/Kconfig
> @@ -4,7 +4,8 @@ config SOC_K210_SYSCTL
>         bool "Canaan Kendryte K210 SoC system controller"
>         depends on RISCV && SOC_CANAAN && OF
>         default SOC_CANAAN
> -        select PM
> -        select MFD_SYSCON
> +       select COMMON_CLK_K210
> +       select PM
> +       select MFD_SYSCON
>         help
>           Canaan Kendryte K210 SoC system controller driver.
> 
> (just noticed that there are whitespace errors here...)

Yes, this patch allows it to build cleanly.
Thanks.

I didn't test any of the below changes.

> Note that both the sysctl and clk driver depend on RISCV. I think these should
> probably also depend on 64BIT, and eventually add a "|| COMPILE_TEST" as well.
> So something like this:
> 
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index b6c5bf69a2b2..657a36d2640d 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -431,7 +431,7 @@ config COMMON_CLK_FIXED_MMIO
> 
>  config COMMON_CLK_K210
>         bool "Clock driver for the Canaan Kendryte K210 SoC"
> -       depends on OF && RISCV && SOC_CANAAN
> +       depends on OF && RISCV && SOC_CANAAN && (64BIT || COMPILE_TEST)
>         default SOC_CANAAN
>         help
>           Support for the Canaan Kendryte K210 RISC-V SoC clocks.
> diff --git a/drivers/soc/canaan/Kconfig b/drivers/soc/canaan/Kconfig
> index 2527cf5757ec..1745a614d2a7 100644
> --- a/drivers/soc/canaan/Kconfig
> +++ b/drivers/soc/canaan/Kconfig
> @@ -2,9 +2,10 @@
> 
>  config SOC_K210_SYSCTL
>         bool "Canaan Kendryte K210 SoC system controller"
> -       depends on RISCV && SOC_CANAAN && OF
> +       depends on RISCV && SOC_CANAAN && OF && (64BIT || COMPILE_TEST)
>         default SOC_CANAAN
> -        select PM
> -        select MFD_SYSCON
> +       select COMMON_CLK_K210
> +       select PM
> +       select MFD_SYSCON
>         help
>           Canaan Kendryte K210 SoC system controller driver.
> 
> COMPILE_TEST is optional though, but I do not see any reason why not eventhough
> in practice these drivers will likely never end up in 32-bits SoC.
> 
> 

-- 
~Randy