linux-kernel - Re: [PATCH v1 1/3] dt-bindings: timer: Add timer for StarFive JH7110 SoC

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Message-ID: <4febeef1-a42a-7d6f-d1af-d8fe19582822@starfivetech.com>
Date:   Tue, 10 Jan 2023 10:14:21 +0800
From:   Xingyu Wu <xingyu.wu@...rfivetech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Samin Guo <samin.guo@...rfivetech.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] dt-bindings: timer: Add timer for StarFive JH7110
 SoC

On 2022/12/23 18:25, Krzysztof Kozlowski wrote:
> On 23/12/2022 10:47, Xingyu Wu wrote:
>> Add bindings for the timer on the JH7110
>> RISC-V SoC by StarFive Technology Ltd.
> 
> Please wrap commit message according to Linux coding style / submission
> process (neither too early nor over the limit):
> https://elixir.bootlin.com/linux/v5.18-rc4/source/Documentation/process/submitting-patches.rst#L586
> 
> 
>> 
>> Signed-off-by: Xingyu Wu <xingyu.wu@...rfivetech.com>
>> ---
>>  .../timer/starfive,jh7110-timers.yaml         | 105 ++++++++++++++++++
>>  1 file changed, 105 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/timer/starfive,jh7110-timers.yaml
>> 
>> diff --git a/Documentation/devicetree/bindings/timer/starfive,jh7110-timers.yaml b/Documentation/devicetree/bindings/timer/starfive,jh7110-timers.yaml
>> new file mode 100644
>> index 000000000000..fe58dc056313
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/timer/starfive,jh7110-timers.yaml
>> @@ -0,0 +1,105 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/timer/starfive,jh7110-timers.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: StarFive Timers
> 
> 
> Not enough, really not enough. Describe the hardware.

Will add. Thanks.

> 
>> +
>> +maintainers:
>> +  - Samin Guo <samin.guo@...rfivetech.com>
>> +  - Xingyu Wu <xingyu.wu@...rfivetech.com>
>> +
>> +properties:
>> +  compatible:
>> +    const: starfive,jh7110-timers
> 
> Why plural "timers", not "timer"? The module is usually called timer -
> see other hardware that type.
> 

Will fix. Thanks.

>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    items:
>> +      - description: timer channel 0 interrupt
>> +      - description: timer channel 1 interrupt
>> +      - description: timer channel 2 interrupt
>> +      - description: timer channel 3 interrupt
>> +
>> +  interrupt-names:
>> +    items:
>> +      - const: timer0
>> +      - const: timer1
>> +      - const: timer2
>> +      - const: timer3
> 
> I would just drop the names, not really useful. Unless you plan to add
> here some generic interrupt (like you did for clock-names)?

Will drop. Thanks.

> 
>> +
>> +  clocks:
>> +    items:
>> +      - description: timer channel 0 clock
>> +      - description: timer channel 1 clock
>> +      - description: timer channel 2 clock
>> +      - description: timer channel 3 clock
>> +      - description: APB clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: timer0
>> +      - const: timer1
>> +      - const: timer2
>> +      - const: timer3
>> +      - const: apb
>> +
>> +  resets:
>> +    items:
>> +      - description: timer channel 0 reset
>> +      - description: timer channel 1 reset
>> +      - description: timer channel 2 reset
>> +      - description: timer channel 3 reset
>> +      - description: APB reset
>> +
>> +  reset-names:
>> +    items:
>> +      - const: timer0
>> +      - const: timer1
>> +      - const: timer2
>> +      - const: timer3
>> +      - const: apb
>> +
>> +  clock-frequency:
>> +    description: The frequency of the clock that drives the counter, in Hz.
> 
> Why do you need it? Use common clk framework to get that frequency.

Because normally this timer driver is loaded earlier than the clock tree driver, it won't get
that frequency by clk framework and this 'clock-frequency' node is used instead.

> 
> Also, sort the nodes somehow, e.g.
> compatible/reg/clocks/clock-frequency/interrupts/resets.

Will reorder. Thanks.

> 
> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - interrupt-names
>> +  - clocks
>> +  - clock-names
>> +  - resets
>> +  - reset-names
>> +  - clock-frequency
>> +
>> +unevaluatedProperties: false
> 
> Did you test the binding?

Yes, I had tested by 'dt_binding_check'. Do you mean the 'unevaluatedProperties' is wrong
and use 'additionalProperties'?

Best regards,
Xingyu Wu