linux-kernel - Re: [PATCH 4/5] riscv: dts: sophgo: add initial CV1800B SoC device tree

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Message-ID: <ZR/7te8fdBQWIZXH@xhacker>
Date:   Fri, 6 Oct 2023 20:21:09 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Conor Dooley <conor@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Anup Patel <anup@...infault.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Inochi Amaoto <inochiama@...look.com>, chao.wei@...hgo.com,
        xiaoguang.xing@...hgo.com
Subject: Re: [PATCH 4/5] riscv: dts: sophgo: add initial CV1800B SoC device
 tree

On Mon, Oct 02, 2023 at 01:09:38PM +0100, Conor Dooley wrote:
> On Sat, Sep 30, 2023 at 08:39:36PM +0800, Jisheng Zhang wrote:
> > Add initial device tree for the CV1800B RISC-V SoC by SOPHGO.
> > 
> > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> > ---
> >  arch/riscv/boot/dts/sophgo/cv1800b.dtsi | 117 ++++++++++++++++++++++++
> >  1 file changed, 117 insertions(+)
> >  create mode 100644 arch/riscv/boot/dts/sophgo/cv1800b.dtsi
> > 
> > diff --git a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
> > new file mode 100644
> > index 000000000000..8829bebaa017
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
> > @@ -0,0 +1,117 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright (C) 2023 Jisheng Zhang <jszhang@...nel.org>
> > + */
> > +
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +
> > +/ {
> > +	compatible = "sophgo,cv1800b";
> > +	#address-cells = <1>;
> > +	#size-cells = <1>;
> > +
> > +	cpus: cpus {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +		timebase-frequency = <25000000>;
> > +
> > +		cpu0: cpu@0 {
> > +			compatible = "thead,c906", "riscv";
> > +			device_type = "cpu";
> > +			reg = <0>;
> > +			d-cache-block-size = <64>;
> > +			d-cache-sets = <512>;
> > +			d-cache-size = <65536>;
> > +			i-cache-block-size = <64>;
> > +			i-cache-sets = <128>;
> > +			i-cache-size = <32768>;
> > +			mmu-type = "riscv,sv39";
> > +			riscv,isa = "rv64imafdc";
> > +			riscv,isa-base = "rv64i";
> > +			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
> > +					       "zifencei", "zihpm";
> > +
> > +			cpu0_intc: interrupt-controller {
> > +				compatible = "riscv,cpu-intc";
> > +				interrupt-controller;
> > +				#address-cells = <0>;
> > +				#interrupt-cells = <1>;
> > +			};
> > +		};
> > +	};
> > +
> > +	osc: oscillator {
> > +		compatible = "fixed-clock";
> > +		clock-output-names = "osc_25m";
> > +		#clock-cells = <0>;
> > +	};
> 
> Is this a stub that will later be replaced by a real clock controller
> node, or is this actually a fixed oscillator? If it is the former, could

Hi Conor,

This is a real 25MHZ oscillator. 

Thanks