linux-kernel - Re: [PATCH v2 04/17] riscv: dts: allwinner: Add xtheadvector to the D1/D1s devicetree

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Message-ID: <20240416-scorer-easeful-4dae3c18465d@spud>
Date: Tue, 16 Apr 2024 16:28:19 +0100
From: Conor Dooley <conor@...nel.org>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: Rob Herring <robh@...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>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Evan Green <evan@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 04/17] riscv: dts: allwinner: Add xtheadvector to the
 D1/D1s devicetree

On Mon, Apr 15, 2024 at 09:12:01PM -0700, Charlie Jenkins wrote:
> The D1/D1s SoCs support xtheadvector which should be included in the
> devicetree. Also include vendorid for the cpu.
> 
> Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> ---
>  arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> index 64c3c2e6cbe0..4788bb50afa2 100644
> --- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> @@ -27,7 +27,8 @@ cpu0: cpu@0 {
>  			riscv,isa = "rv64imafdc";
>  			riscv,isa-base = "rv64i";
>  			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
> -					       "zifencei", "zihpm";
> +					       "zifencei", "zihpm", "xtheadvector";


> +			riscv,vendorid = <0x00000000 0x0000005b7>;

Isn't this effectively useless given there's only one CPU here?
We also already know the vendor of the hart, because the compatible says
it is a "thead,c906" so this doesn't provide any new information.

>  			#cooling-cells = <2>;
>  
>  			cpu0_intc: interrupt-controller {
> 
> -- 
> 2.44.0
> 

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