linux-kernel - Re: [PATCH v2 11/12] riscv: Add the Allwinner SoC family Kconfig option

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Message-ID: <Y4JAh72RUJFS/RtR@spud>
Date:   Sat, 26 Nov 2022 16:36:23 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev, Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Christian Hewitt <christianshewitt@...il.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Stanislav Jakubek <stano.jakubek@...il.com>
Subject: Re: [PATCH v2 11/12] riscv: Add the Allwinner SoC family Kconfig
 option

On Fri, Nov 25, 2022 at 05:46:55PM -0600, Samuel Holland wrote:
> Allwinner manufactures the sunxi family of application processors. This
> includes the "sun8i" series of ARMv7 SoCs, the "sun50i" series of ARMv8
> SoCs, and now the "sun20i" series of 64-bit RISC-V SoCs.
> 
> The first SoC in the sun20i series is D1, containing a single T-HEAD
> C906 core. D1s is a low-pin-count variant of D1 with co-packaged DRAM.
> 
> Most peripherals are shared across the entire chip family. In fact, the
> ARMv7 T113 SoC is pin-compatible and almost entirely register-compatible
> with the D1s.
> 
> This means many existing device drivers can be reused. To facilitate
> this reuse, name the symbol ARCH_SUNXI, since that is what the existing
> drivers have as their dependency.
> 
> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> Tested-by: Heiko Stuebner <heiko@...ech.de>
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> 
> Changes in v2:
>  - Sort Kconfig as if we had done s/SOC_/ARCH_/ for future-proofing
> 
>  arch/riscv/Kconfig.socs | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> index 69774bb362d6..4c1dc2ca11f9 100644
> --- a/arch/riscv/Kconfig.socs
> +++ b/arch/riscv/Kconfig.socs
> @@ -26,6 +26,15 @@ config SOC_STARFIVE
>  	help
>  	  This enables support for StarFive SoC platform hardware.
>  
> +config ARCH_SUNXI
> +	bool "Allwinner sun20i SoCs"
> +	select ERRATA_THEAD if MMU && !XIP_KERNEL

Does this need to have the if MMU? I thought it only needed the
!XIP_KERNEL since the PMU errata does not depend on MMU.

Or have a missed some patch elsewhere that'll change that?

> +	select SIFIVE_PLIC

This is v6.3 material right? One of the things that should be going for
v6.3 is all of these select SIFIVE_PLICs. Palmer suggested putting up an
immutable branch for any of that cleanup that intersects with new
platforms, so I'll probably send one out at some stage.

Thanks,
Conor.

> +	select SUN4I_TIMER
> +	help
> +	  This enables support for Allwinner sun20i platform hardware,
> +	  including boards based on the D1 and D1s SoCs.
> +
>  config SOC_VIRT
>  	bool "QEMU Virt Machine"
>  	select CLINT_TIMER if RISCV_M_MODE
> -- 
> 2.37.4
>