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Date:   Tue, 04 Aug 2020 18:47:55 -0700 (PDT)
Subject:     Re: [PATCH v6 4/4] dt-bindings: timer: Add CLINT bindings
In-Reply-To: <20200724071822.126758-5-anup.patel@wdc.com>
CC:     Paul Walmsley <paul.walmsley@sifive.com>, aou@eecs.berkeley.edu,
        robh+dt@kernel.org, daniel.lezcano@linaro.org, tglx@linutronix.de,
        Damien Le Moal <Damien.LeMoal@wdc.com>,
        Atish Patra <Atish.Patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        anup@brainfault.org, linux-riscv@lists.infradead.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        Anup Patel <Anup.Patel@wdc.com>, kernel@esmil.dk
From:   Palmer Dabbelt <palmer@dabbelt.com>
To:     Anup Patel <Anup.Patel@wdc.com>
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On Fri, 24 Jul 2020 00:18:22 PDT (-0700), Anup Patel wrote:
> We add DT bindings documentation for CLINT device.
>
> Signed-off-by: Anup Patel <anup.patel@wdc.com>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
> Tested-by: Emil Renner Berhing <kernel@esmil.dk>
> ---
>  .../bindings/timer/sifive,clint.yaml          | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/timer/sifive,clint.yaml
>
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> new file mode 100644
> index 000000000000..2a0e9cd9fbcf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/sifive,clint.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SiFive Core Local Interruptor
> +
> +maintainers:
> +  - Palmer Dabbelt <palmer@dabbelt.com>
> +  - Anup Patel <anup.patel@wdc.com>
> +
> +description:
> +  SiFive (and other RISC-V) SOCs include an implementation of the SiFive
> +  Core Local Interruptor (CLINT) for M-mode timer and M-mode inter-processor
> +  interrupts. It directly connects to the timer and inter-processor interrupt
> +  lines of various HARTs (or CPUs) so RISC-V per-HART (or per-CPU) local
> +  interrupt controller is the parent interrupt controller for CLINT device.
> +  The clock frequency of CLINT is specified via "timebase-frequency" DT
> +  property of "/cpus" DT node. The "timebase-frequency" DT property is
> +  described in Documentation/devicetree/bindings/riscv/cpus.yaml
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: sifive,fu540-c000-clint
> +      - const: sifive,clint0
> +
> +    description:
> +      Should be "sifive,<chip>-clint" and "sifive,clint<version>".
> +      Supported compatible strings are -
> +      "sifive,fu540-c000-clint" for the SiFive CLINT v0 as integrated
> +      onto the SiFive FU540 chip, and "sifive,clint0" for the SiFive
> +      CLINT v0 IP block with no chip integration tweaks.
> +      Please refer to sifive-blocks-ip-versioning.txt for details

Perfect!  I was going to mention that we forgot to define the
"sifive,${name}${version}" scheme but I guess I just forgot that we did define
it ;)

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts-extended:
> +    minItems: 1
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts-extended
> +
> +examples:
> +  - |
> +    timer@2000000 {
> +      compatible = "sifive,fu540-c000-clint", "sifive,clint0";
> +      interrupts-extended = <&cpu1intc 3 &cpu1intc 7
> +                             &cpu2intc 3 &cpu2intc 7
> +                             &cpu3intc 3 &cpu3intc 7
> +                             &cpu4intc 3 &cpu4intc 7>;
> +       reg = <0x2000000 0x10000>;
> +    };
> +...

Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>