linux-kernel - Re: [PATCH 2/4] dt-bindings: arm: mediatek: Add new bindings of MediaTek frequency hopping

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Message-ID: <4e5d2fc2-5816-ba31-6a75-da669eddc5cf@linaro.org>
Date:   Mon, 5 Sep 2022 12:05:49 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Johnson Wang <johnson.wang@...iatek.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        angelogioacchino.delregno@...labora.com, sboyd@...nel.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Edward-JW Yang <edward-jw.yang@...iatek.com>
Subject: Re: [PATCH 2/4] dt-bindings: arm: mediatek: Add new bindings of
 MediaTek frequency hopping

On 02/09/2022 08:39, Johnson Wang wrote:
> On Wed, 2022-08-31 at 16:19 +0300, Krzysztof Kozlowski wrote:
>> On 31/08/2022 15:48, Johnson Wang wrote:
>>> Add the new binding documentation for MediaTek frequency hopping
>>> and spread spectrum clocking control.
>>>
>>> Co-developed-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
>>> Signed-off-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
>>> Signed-off-by: Johnson Wang <johnson.wang@...iatek.com>
>>> ---
>>>  .../bindings/arm/mediatek/mediatek,fhctl.yaml | 49
>>> +++++++++++++++++++
>>>  1 file changed, 49 insertions(+)
>>>  create mode 100644
>>> Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yaml
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam
>>> l
>>> b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam
>>> l
>>> new file mode 100644
>>> index 000000000000..c5d76410538b
>>> --- /dev/null
>>> +++
>>> b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam
>>> l
>>> @@ -0,0 +1,49 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: 
>>> https://urldefense.com/v3/__http://devicetree.org/schemas/arm/mediatek/mediatek,fhctl.yaml*__;Iw!!CTRNKA9wMg0ARbw!ysl-bMp7yP9Ym70o6EVB8A36MBxcXGap8doEKR_SbaAQSy8-_RU5jvrWTjzETut_6eXNGut4j-3dY0q7xJdpQbmaOw$
>>>  
>>> +$schema: 
>>> https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!ysl-bMp7yP9Ym70o6EVB8A36MBxcXGap8doEKR_SbaAQSy8-_RU5jvrWTjzETut_6eXNGut4j-3dY0q7xJezt7_RBw$
>>>  
>>> +
>>> +title: MediaTek frequency hopping and spread spectrum clocking
>>> control
>>> +
>>> +maintainers:
>>> +  - Edward-JW Yang <edward-jw.yang@...iatek.com>
>>> +
>>> +description: |
>>> +  Frequency hopping control (FHCTL) is a piece of hardware that
>>> control
>>> +  some PLLs to adopt "hopping" mechanism to adjust their
>>> frequency.
>>> +  Spread spectrum clocking (SSC) is another function provided by
>>> this hardware.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: mediatek,fhctl
>>
>> You need SoC/device specific compatibles. Preferably only SoC
>> specific,
>> without generic fallback, unless you can guarantee (while
>> representing
>> MediaTek), that generic fallback will cover all of their SoCs?
>>
> 
> Hi Krzysztof,
> 
> At this moment, we plan to support FHCTL feature for MT8186 only.
> 
> If you prefer SoC-specific compatble, we will improve that in the next
> version.

Then make it only for mt8186.

Best regards,
Krzysztof