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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>,
	Vinod Koul <vkoul@kernel.org>, Rob Herring <robh+dt@kernel.org>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	linux-phy@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Eddie Hung <eddie.hung@mediatek.com>
Subject: Re: [PATCH 2/7] dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis
Date: Fri, 26 Aug 2022 09:36:57 +0300	[thread overview]
Message-ID: <000babd8-5980-3d77-f156-324b3442cbe7@linaro.org> (raw)
In-Reply-To: <1a16cce9fe164bafc06ae193310be71c6f645d75.camel@mediatek.com>

On 26/08/2022 08:36, Chunfeng Yun wrote:
> On Tue, 2022-08-23 at 13:24 +0300, Krzysztof Kozlowski wrote:
>> On 22/08/2022 10:07, Chunfeng Yun wrote:
>>> On Fri, 2022-08-19 at 15:15 +0300, Krzysztof Kozlowski wrote:
>>>> On 19/08/2022 12:13, Chunfeng Yun wrote:
>>>>> Add a property to set usb2 phy's pre-emphasis.
>>>>>
>>>>> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
>>>>> ---
>>>>>  Documentation/devicetree/bindings/phy/mediatek,tphy.yaml | 7
>>>>> +++++++
>>>>>  1 file changed, 7 insertions(+)
>>>>>
>>>>> diff --git
>>>>> a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>>>>> b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>>>>> index 848edfb1f677..aee2f3027371 100644
>>>>> --- a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>>>>> +++ b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>>>>> @@ -219,6 +219,13 @@ patternProperties:
>>>>>          minimum: 1
>>>>>          maximum: 15
>>>>>  
>>>>> +      mediatek,pre-emphasis:
>>>>> +        description:
>>>>> +          The selection of pre-emphasis (U2 phy)
>>>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>>>> +        minimum: 1
>>>>> +        maximum: 3
>>>>
>>>> Instead of hard-coding register values in bindings, you should
>>>> rather
>>>> describe here feature/effect. If it is in units, use unit
>>>> suffixes.
>>>> If
>>>> it is some choice, usually string enum is appropriate.
>>>
>>> How about changing description as bellow:
>>>
>>> "The level of pre-emphasis, increases one level, boosts the
>>> relative
>>> amplitudes of signal's higher frequencies components about 4.16%
>>> (U2
>>> phy)"
>>>
>>
>> Still the question is what is the unit. 4.16%?
> No unit, it's a level value, like an index of array.
> 

So a value from register/device programming? Rather a regular units
should be used if that's possible. If not, this should be clearly
described here, not some magical number which you encode into DTS...

Best regards,
Krzysztof

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  reply	other threads:[~2022-08-26  6:38 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-19  9:13 [PATCH 1/7] dt-bindings: phy: mediatek,tphy: add support type of SGMII Chunfeng Yun
2022-08-19  9:13 ` [PATCH 2/7] dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis Chunfeng Yun
2022-08-19 12:15   ` Krzysztof Kozlowski
2022-08-22  7:07     ` Chunfeng Yun
2022-08-23 10:24       ` Krzysztof Kozlowski
2022-08-26  5:36         ` Chunfeng Yun
2022-08-26  6:36           ` Krzysztof Kozlowski [this message]
2022-08-29  2:37             ` Chunfeng Yun
2022-08-30 10:08               ` Krzysztof Kozlowski
2022-08-31  3:00                 ` Chunfeng Yun
2022-08-31  6:03                   ` Krzysztof Kozlowski
2022-09-08  1:45                     ` Chunfeng Yun
2022-09-09  3:03                     ` Chunfeng Yun
2022-09-09  8:27                       ` Krzysztof Kozlowski
2022-09-14  5:42                         ` Chunfeng Yun
2022-08-19  9:13 ` [PATCH 3/7] phy: phy-mtk-tphy: " Chunfeng Yun
2022-08-19  9:13 ` [PATCH 4/7] phy: phy-mtk-tphy: disable hardware efuse when set INTR Chunfeng Yun
2022-08-19  9:13 ` [PATCH 5/7] phy: phy-mtk-tphy: disable gpio mode for all usb2 phys Chunfeng Yun
2022-08-19  9:13 ` [PATCH 6/7] phy: phy-mtk-tphy: set utmi 0 register in init() ops Chunfeng Yun
2022-08-19  9:13 ` [PATCH 7/7] phy: phy-mtk-tphy: fix the phy type setting issue Chunfeng Yun
2022-08-22 18:25 ` [PATCH 1/7] dt-bindings: phy: mediatek,tphy: add support type of SGMII Rob Herring
2022-08-23 20:44 ` Nícolas F. R. A. Prado
2022-08-29  6:30   ` Chunfeng Yun

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