linux-kernel - RE: [PATCH v3 6/6] riscv: dts: starfive: Add initial StarFive JH8100 device tree

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Date:   Thu, 14 Dec 2023 00:34:53 +0000
From:   JeeHeng Sia <jeeheng.sia@...rfivetech.com>
To:     Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        "kernel@...il.dk" <kernel@...il.dk>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "krzk@...nel.org" <krzk@...nel.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "palmer@...belt.com" <palmer@...belt.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "conor@...nel.org" <conor@...nel.org>,
        "anup@...infault.org" <anup@...infault.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jirislaby@...nel.org" <jirislaby@...nel.org>,
        "michal.simek@....com" <michal.simek@....com>,
        Michael Zhu <michael.zhu@...rfivetech.com>,
        "drew@...gleboard.org" <drew@...gleboard.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>
Subject: RE: [PATCH v3 6/6] riscv: dts: starfive: Add initial StarFive JH8100
 device tree



> -----Original Message-----
> From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
> Sent: Wednesday, December 13, 2023 8:39 PM
> To: Emil Renner Berthing <emil.renner.berthing@...onical.com>; JeeHeng Sia <jeeheng.sia@...rfivetech.com>; kernel@...il.dk;
> robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org; krzk@...nel.org; conor+dt@...nel.org; paul.walmsley@...ive.com;
> palmer@...belt.com; aou@...s.berkeley.edu; daniel.lezcano@...aro.org; tglx@...utronix.de; conor@...nel.org;
> anup@...infault.org; gregkh@...uxfoundation.org; jirislaby@...nel.org; michal.simek@....com; Michael Zhu
> <michael.zhu@...rfivetech.com>; drew@...gleboard.org
> Cc: devicetree@...r.kernel.org; linux-riscv@...ts.infradead.org; linux-kernel@...r.kernel.org; Leyfoon Tan
> <leyfoon.tan@...rfivetech.com>
> Subject: Re: [PATCH v3 6/6] riscv: dts: starfive: Add initial StarFive JH8100 device tree
> 
> Emil Renner Berthing wrote:
> > Sia Jee Heng wrote:
> > > Add initial device tree for the StarFive JH8100 RISC-V SoC.
> > >
> > > Signed-off-by: Sia Jee Heng <jeeheng.sia@...rfivetech.com>
> > > Reviewed-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
> >
> > Looks good to me, thanks.
> >
> > Acked-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
> 
> I just learned that this JH8100 is not actually a real SoC yet but just an FPGA
> implementation, and no indication that that's actually a product that will be
> mass produced. Hence a lot of details may change before it becomes a real
> SoC/product people can buy, so let's not add this device tree yet before
> everything is set in silicon.
> 
> Please consider my Acked-by abeve revoked.
> 
> Sia Jee Heng: With that said I still think it's super awesome that you're
> beginning upstreaming support for your new SoCs early. I wish more SoC vendors
> would follow your example.
Hi Emil, I am not sure what you mean. We verified on FPGA & Emulator, and the logic
is pretty much close to the real silicon. I did mention that in the cover letter as well.
I am new to Linux, so I am wondering if there is a Linux upstream guideline mentioning
that pre-silicon software is not allowed to upstream? Hope there is an updated Linux
upstream guideline that benefit other vendors.
> 
> /Emil