Message-ID: <CAJM55Z_f=zp3Z=wno_yr7csAUMQ472RiZXD19CrDTTxmGAmU4w@mail.gmail.com>
Date:   Sun, 20 Nov 2022 15:57:17 +0100
From:   Emil Renner Berthing <emil.renner.berthing@...onical.com>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 5/7] riscv: dts: bouffalolab: add the bl808 SoC base
 device tree

On Sun, 20 Nov 2022 at 09:32, Jisheng Zhang <jszhang@...nel.org> wrote:
>
> Add a baisc dtsi for the bouffalolab bl808 SoC.
>
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  arch/riscv/boot/dts/Makefile               |  1 +
>  arch/riscv/boot/dts/bouffalolab/bl808.dtsi | 74 ++++++++++++++++++++++
>  2 files changed, 75 insertions(+)
>  create mode 100644 arch/riscv/boot/dts/bouffalolab/bl808.dtsi
>
> diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
> index ff174996cdfd..b525467152b2 100644
> --- a/arch/riscv/boot/dts/Makefile
> +++ b/arch/riscv/boot/dts/Makefile
> @@ -1,4 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> +subdir-y += bouffalolab
>  subdir-y += sifive
>  subdir-y += starfive
>  subdir-$(CONFIG_SOC_CANAAN_K210_DTB_BUILTIN) += canaan
> diff --git a/arch/riscv/boot/dts/bouffalolab/bl808.dtsi b/arch/riscv/boot/dts/bouffalolab/bl808.dtsi
> new file mode 100644
> index 000000000000..c98ebb14ee10
> --- /dev/null
> +++ b/arch/riscv/boot/dts/bouffalolab/bl808.dtsi
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
> +/*
> + * Copyright (C) 2022 Jisheng Zhang <jszhang@...nel.org>
> + */
> +
> +#include <dt-bindings/interrupt-controller/irq.h>
> +
> +/ {
> +       compatible = "bouffalolab,bl808";
> +       #address-cells = <1>;
> +       #size-cells = <1>;
> +
> +       cpus {
> +               timebase-frequency = <1000000>;
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +
> +               cpu0: cpu@0 {
> +                       compatible = "thead,c906", "riscv";
> +                       device_type = "cpu";
> +                       reg = <0>;
> +                       d-cache-block-size = <64>;
> +                       d-cache-sets = <256>;
> +                       d-cache-size = <32768>;
> +                       i-cache-block-size = <64>;
> +                       i-cache-sets = <128>;
> +                       i-cache-size = <32768>;
> +                       mmu-type = "riscv,sv39";
> +                       riscv,isa = "rv64imafdc";
> +
> +                       cpu0_intc: interrupt-controller {
> +                               compatible = "riscv,cpu-intc";
> +                               interrupt-controller;
> +                               #address-cells = <0>;
> +                               #interrupt-cells = <1>;
> +                       };
> +               };
> +       };
> +
> +       xtal: xtal-clk {
> +               compatible = "fixed-clock";
> +               clock-frequency = <40000000>;

This was discussed many times before, but I think the conclusion was
that the frequency is a property of the crystal on the board, so this
should be 0 in the SoC dtsi, and then overwritten in the board device
tree.

> +               clock-output-names = "xtal";
> +               #clock-cells = <0>;
> +       };
> +
> +       soc {
> +               compatible = "simple-bus";
> +               ranges;
> +               interrupt-parent = <&plic>;
> +               dma-noncoherent;
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +
> +               uart0: serial@...02000 {
> +                       compatible = "bouffalolab,uart";
> +                       reg = <0x30002000 0x1000>;
> +                       interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> +                       clocks = <&xtal>;
> +                       status = "disabled";
> +               };
> +
> +               plic: interrupt-controller@...00000 {
> +                       compatible = "thead,c900-plic";
> +                       reg = <0xe0000000 0x4000000>;
> +                       interrupts-extended = <&cpu0_intc 0xffffffff>,
> +                                             <&cpu0_intc 9>;
> +                       interrupt-controller;
> +                       #address-cells = <0>;
> +                       #interrupt-cells = <2>;
> +                       riscv,ndev = <64>;
> +               };
> +       };
> +};
> --
> 2.37.2
>
>
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