Date:   Fri, 26 May 2023 10:19:10 +0800
From:   Yixun Lan <dlan@...too.org>
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>, Guo Ren <guoren@...nel.org>,
        devicetree@...r.kernel.org, Yangtao Li <frank.li@...o.com>,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Wei Fu <wefu@...hat.com>
Subject: Re: [PATCH v2 0/9] Add Sipeed Lichee Pi 4A RISC-V board support

Hi Jisheng
On 02:45 Fri 19 May     , 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.
> 
> FWICT, one issue I'm not sure is the cpu reset dt-binding: IIUC, the
> secondary CPUs in T-HEAD SMP capable platforms need some special
> handling. The first one is to write the warm reset entry to entry
> register. The second one is write a SoC specific control value to
> a SoC specific control reg. The last one is to clone some CSRs for
> secondary CPUs to ensure these CSRs' values are the same as the
> main boot CPU. This DT node is mainly used by opensbi firmware.
> Any suggestion about this reset dt-binding is appreciated!
> 
> Thanks
> 
> Since v1:
>   - add missing plic, clint, th1520 itself dt-bindings
>   - use c900-plic
>   - s/light/th1520
>   - add dt-binding for T-HEAD CPU reset
>   - enable ARCH_THEAD in defconfig
>   - fix all dtbs_check error/warning except the CPU RESET, see above.
it would be nice to have a URL reference to v0
https://lore.kernel.org/all/20230507182304.2934-1-jszhang@kernel.org/

> 
> Jisheng Zhang (9):
>   dt-bindings: interrupt-controller: Add T-HEAD's TH1520 PLIC
>   dt-bindings: timer: Add T-HEAD TH1520 clint
>   dt-bindings: riscv: Add T-HEAD TH1520 board compatibles
>   dt-binding: riscv: add T-HEAD CPU reset
>   riscv: Add the T-HEAD SoC family Kconfig option
>   riscv: dts: add initial T-HEAD TH1520 SoC device tree
>   riscv: dts: thead: add sipeed Lichee Pi 4A board device tree
>   MAINTAINERS: add entry for T-HEAD RISC-V SoC
>   riscv: defconfig: enable T-HEAD SoC
> 
>  .../sifive,plic-1.0.0.yaml                    |   1 +
>  .../bindings/riscv/thead,cpu-reset.yaml       |  69 +++
>  .../devicetree/bindings/riscv/thead.yaml      |  29 ++
>  .../bindings/timer/sifive,clint.yaml          |   1 +
>  MAINTAINERS                                   |   6 +
>  arch/riscv/Kconfig.socs                       |   6 +
>  arch/riscv/boot/dts/Makefile                  |   1 +
>  arch/riscv/boot/dts/thead/Makefile            |   2 +
>  .../dts/thead/th1520-lichee-module-4a.dtsi    |  38 ++
>  .../boot/dts/thead/th1520-lichee-pi-4a.dts    |  32 ++
>  arch/riscv/boot/dts/thead/th1520.dtsi         | 451 ++++++++++++++++++
>  arch/riscv/configs/defconfig                  |   1 +
>  12 files changed, 637 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/riscv/thead,cpu-reset.yaml
>  create mode 100644 Documentation/devicetree/bindings/riscv/thead.yaml
>  create mode 100644 arch/riscv/boot/dts/thead/Makefile
>  create mode 100644 arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
>  create mode 100644 arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
>  create mode 100644 arch/riscv/boot/dts/thead/th1520.dtsi
> 
> -- 
> 2.40.0
> 
> 
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-- 
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55

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