linux-kernel - Re: [PATCH v1 2/2] dt-bindings: hpet: add loongson2k hpet binding

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Date:   Sun, 9 Oct 2022 17:14:23 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        Yun Liu <liuyun@...ngson.cn>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        loongarch@...ts.linux.dev
Subject: Re: [PATCH v1 2/2] dt-bindings: hpet: add loongson2k hpet binding

On 08/10/2022 05:21, Yinbo Zhu wrote:
> 
> 
> 在 2022/9/30 下午5:58, Krzysztof Kozlowski 写道:
>> On 30/09/2022 11:35, Yinbo Zhu wrote:
>>> Add the loongson2k High Precision Event Timer (HPET) binding
>>> with DT schema format using json-schema.
>>>
>>> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
>>> ---
>>>   .../bindings/timer/loongson,ls2k-hpet.yaml    | 41 +++++++++++++++++++
>>>   MAINTAINERS                                   |  1 +
>>>   2 files changed, 42 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/timer/loongson,ls2k-hpet.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/timer/loongson,ls2k-hpet.yaml b/Documentation/devicetree/bindings/timer/loongson,ls2k-hpet.yaml
>>> new file mode 100644
>>> index 000000000000..1a8785076228
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/timer/loongson,ls2k-hpet.yaml
>>> @@ -0,0 +1,41 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/timer/loongson,ls2k-hpet.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Loongson2k High Precision Event Timer (HPET)
>>> +
>>> +maintainers:
>>> +  - Yinbo Zhu <zhuyinbo@...ngson.cn>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: loongson,ls2k-hpet
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  clock-frequency: true
>>
>> clock frequency of what? I assume it's too early to use common clock
>> framework and just get the clock?

Still you did not answer: which/what clock?

> The clock-frequency is 125000000, It doesn't support use common clock 
> framework 

But it should use CCF, if possible.

> and just get the clock from dts, and I refer 

How do you "get" the clock from DTS?

> "arm,armv7m-systick" to add the clock-frequency information:

Better go with Common Clock Framework instead.

> 
>    clock-frequency: true
> 
> oneOf:
>    - required:
>        - clocks
>    - required:
>        - clock-frequency
>>

Best regards,
Krzysztof