linux-kernel - Re: [PATCH v3 0/8] Add Sipeed Lichee Pi 4A RISC-V board support

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Message-ID: <ZNZyNjjekd2SW/mn@x1>
Date:   Fri, 11 Aug 2023 10:39:02 -0700
From:   Drew Fustini <dfustini@...libre.com>
To:     Jisheng Zhang <jszhang@...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>,
        Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 0/8] Add Sipeed Lichee Pi 4A RISC-V board support

On Sun, Jun 18, 2023 at 12:15:21AM +0800, Jisheng Zhang wrote:
> Sipeed's Lichee Pi 4A development board uses Lichee Module 4A core
> module which is powered by T-HEAD's TH1520 SoC. Add minimal device
> tree files for the core module and the development board.
> 
> Support basic uart/gpio/dmac drivers, so supports booting to a basic
> shell.
> 
> NOTE: the thead cpu reset dt-binding and DT node are removed in v3. This
> makes secondary CPUs unable to be online. However, minimal th1520
> support is better than nothing. And the community has been working on
> and will work on the cpu reset dt-binding, for example, Conor, Guo and
> Jessica are discussing about it, I have seen valuable comments and
> inputs from them. I believe we can add back cpu reset in next
> development window.

I'm interested in starting the secondary cpus on mainline. It seems that
that "thead,reset-sample" is already implemented in upstream OpenSBI in
lib/utils/reset/fdt_reset_thead.c and the issue is getting the
dt-binding accepted. Is that correct?

It looks like you've tried to restart the discussion on the DT list [1]
so I hope that the DT maintainers will give their perspective.

Thank you,
Drew

[1] https://lore.kernel.org/all/ZNURXBKkYdiWLanf@xhacker/