linux-kernel - Re: [PATCH v4 4/4] dt-bindings: timer: Add CLINT bindings

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Date:   Tue, 21 Jul 2020 08:17:59 -0400
From:   Sean Anderson <seanga2@...il.com>
To:     Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>
Cc:     devicetree@...r.kernel.org, Damien Le Moal <damien.lemoal@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Emil Renner Berhing <kernel@...il.dk>,
        Anup Patel <anup.patel@....com>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Atish Patra <atish.patra@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Alistair Francis <Alistair.Francis@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v4 4/4] dt-bindings: timer: Add CLINT bindings

On 7/20/20 9:15 PM, Atish Patra wrote:
> On Fri, Jul 17, 2020 at 12:52 AM Anup Patel <anup.patel@....com> wrote:
>>
>> We add DT bindings documentation for CLINT device.
>>
>> Signed-off-by: Anup Patel <anup.patel@....com>
>> Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
>> Tested-by: Emil Renner Berhing <kernel@...il.dk>
>> ---
>>  .../bindings/timer/sifive,clint.yaml          | 58 +++++++++++++++++++
>>  1 file changed, 58 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..8ad115611860
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
>> @@ -0,0 +1,58 @@
>> +# 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@...belt.com>
>> +  - Anup Patel <anup.patel@....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,clint0
>> +      - const: sifive,fu540-c000-clint
>> +
>> +    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
>> +
> 
> As the DT binding suggests that the clint device should be named as "sifive,**",
> I think we should change the DT property in kendryte dts as well.

The kendryte device is based on Rocket Chip, not any SiFive IP/device.
If anything, the general binding should be "chipsalliance,clint" and the
specific bindings should be "sifive,clint" and "kendryte,clint" (or
"canaan,clint").

--Sean