linux-kernel - Re: [PATCH RFC 08/10] riscv: dts: Add initial Anlogic DR1V90 SoC device tree

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Message-ID: <20250722-proposal-gothic-e0c3725e0874@spud>
Date: Tue, 22 Jul 2025 16:21:21 +0100
From: Conor Dooley <conor@...nel.org>
To: Junhui Liu <junhui.liu@...moral.tech>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Anup Patel <anup@...infault.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...ive.com>,
	linux-riscv@...ts.infradead.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH RFC 08/10] riscv: dts: Add initial Anlogic DR1V90 SoC
 device tree

On Mon, Jul 21, 2025 at 11:46:14PM +0800, Junhui Liu wrote:
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		timebase-frequency = <800000000>;
> +
> +		cpu@0 {
> +			compatible = "nuclei,ux900", "riscv";
> +			device_type = "cpu";
> +			reg = <0>;
> +			riscv,isa = "rv64imafdc";
> +			riscv,isa-base = "rv64i";
> +			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zba", "zbb", "zbc",
> +					       "zbkc", "zbs", "zicntr", "zicsr", "zifencei",
> +					       "zihintpause", "zihpm";

Why do riscv,isa and riscv,isa-extensions differ?
If riscv,isa is not even accurate, why not just remove it entirely?

> +			i-cache-block-size = <64>;
> +			i-cache-size = <32768>;
> +			i-cache-sets = <256>;
> +			d-cache-block-size = <64>;
> +			d-cache-size = <32768>;
> +			d-cache-sets = <256>;
> +			mmu-type = "riscv,sv39";
> +
> +			cpu0_intc: interrupt-controller {
> +				compatible = "riscv,cpu-intc";
> +				interrupt-controller;
> +				#interrupt-cells = <1>;
> +			};
> +		};
> +	};

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