linux-kernel - Re: [PATCH v2] riscv: dts: sophgo: add watchdog dt node for CV1800

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Message-ID: <dxxc42mcdw6jlpk4lffyxqci7d6bamc7q5wsfdcx62snacbw2e@jrvrllwdb6t6>
Date: Sat, 15 Feb 2025 06:42:08 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Alexander Sverdlin <alexander.sverdlin@...il.com>, 
	AnnanLiu <annan.liu.xdu@...look.com>, chao.wei@...hgo.com, unicorn_wang@...look.com, 
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	Inochi Amaoto <inochiama@...il.com>
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, 
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] riscv: dts: sophgo: add watchdog dt node for CV1800

On Fri, Feb 14, 2025 at 01:58:15PM +0100, Alexander Sverdlin wrote:
> Hi Annan, Inochi,
> 
> On Thu, 2024-01-25 at 17:46 +0800, AnnanLiu wrote:
> > Add the watchdog device tree node to cv1800 SoC.
> > 
> > Signed-off-by: AnnanLiu <annan.liu.xdu@...look.com>
> > ---
> > This patch depends on the clk driver and reset driver.
> > Clk driver link:
> > https://lore.kernel.org/all/IA1PR20MB49539CDAD9A268CBF6CA184BBB9FA@IA1PR20MB4953.namprd20.prod.outlook.com/
> > Reset driver link:
> > https://lore.kernel.org/all/20231113005503.2423-1-jszhang@kernel.org/
> > 
> > Changes since v1:
> > - Change the name of the watchdog from watchdog0 to watchdog.
> > - Change the status of watchdog.
> > v1 link:
> > https://lore.kernel.org/all/DM6PR20MB23160B8499CC2BFDAE6FCACDAB9EA@DM6PR20MB2316.namprd20.prod.outlook.com/
> > 
> > 
> >  arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts |  4 ++++
> >  arch/riscv/boot/dts/sophgo/cv1800b.dtsi          | 16 ++++++++++++++++
> >  2 files changed, 20 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
> > index 3af9e34b3bc7..75469161bfff 100644
> > --- a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
> > +++ b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
> > @@ -36,3 +36,7 @@ &osc {
> >  &uart0 {
> >  	status = "okay";
> >  };
> > +
> > +&watchdog {
> > +	status = "okay";
> > +};
> 
> It would be necessary in all SoCs unless... [1]
> 
> > diff --git a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
> > index aec6401a467b..03ca32cd37b6 100644
> > --- a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
> > +++ b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
> > @@ -1,6 +1,7 @@
> >  // SPDX-License-Identifier: (GPL-2.0 OR MIT)
> >  /*
> >   * Copyright (C) 2023 Jisheng Zhang <jszhang@...nel.org>
> > + * Copyright (C) 2024 Annan Liu <annan.liu.xdu@...look.com>
> >   */
> >  
> >  #include <dt-bindings/interrupt-controller/irq.h>
> > @@ -103,6 +104,21 @@ uart4: serial@...0000 {
> >  			status = "disabled";
> >  		};
> >  
> > +		watchdog: watchdog@...0000{
> > +			compatible = "snps,dw-wdt";
> > +			reg = <0x3010000 0x100>;
> > +			interrupts = <58 IRQ_TYPE_LEVEL_HIGH>;
> > +			clocks = <&pclk>;
> 
> &osc ?
> 

This patch is submitted to early, before the clock driver is
applied. This reason applies to your all question.

> > +			resets = <&rst RST_WDT>;
> > +			status = "disabled";
> 
> [1] ... the status here is dropped. What is the reason for disabling it in the first place?
> 
> > +		};
> > +
> > +		pclk: pclk {
> > +			#clock-cells = <0>;
> > +			compatible = "fixed-clock";
> > +			clock-frequency = <25000000>;
> > +		};
> > +
> >  		plic: interrupt-controller@...00000 {
> >  			compatible = "sophgo,cv1800b-plic", "thead,c900-plic";
> >  			reg = <0x70000000 0x4000000>;
> 
> Why didn't it go into cv18xx.dtsi?
> 
> -- 
> Alexander Sverdlin.
>