linux-kernel - Re: [PATCH 2/2] dt-bindings: tpm: Add st,st33ktpm2xi2c to TCG TIS binding

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Message-ID: <8de8590f-0ed3-4fd1-82a3-96b5fb767e48@linaro.org>
Date: Sun, 14 Apr 2024 07:52:08 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: "Haener, Michael" <michael.haener@...mens.com>,
 "lukas@...ner.de" <lukas@...ner.de>
Cc: "jgg@...pe.ca" <jgg@...pe.ca>, "jarkko@...nel.org" <jarkko@...nel.org>,
 "peterhuewe@....de" <peterhuewe@....de>,
 "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
 "robh@...nel.org" <robh@...nel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
 "Sverdlin, Alexander" <alexander.sverdlin@...mens.com>
Subject: Re: [PATCH 2/2] dt-bindings: tpm: Add st,st33ktpm2xi2c to TCG TIS
 binding

On 14/04/2024 07:42, Haener, Michael wrote:
> On Sat, 2024-04-13 at 13:01 +0200, Krzysztof Kozlowski wrote:
>> On 13/04/2024 12:56, Lukas Wunner wrote:
>>> On Sat, Apr 13, 2024 at 12:53:25PM +0200, Krzysztof Kozlowski
>>> wrote:
>>>> On 13/04/2024 12:51, Lukas Wunner wrote:
>>>>> The binding requires two entries in the compatible string used
>>>>> in the DT,
>>>>> the chip name followed by the generic string:
>>>>>
>>>>>         items:
>>>>>           - enum:
>>>>>               - infineon,slb9673
>>>>>               - nuvoton,npct75x
>>>>>           - const: tcg,tpm-tis-i2c
>>>>>
>>>>> This allows us to deal with device-specific quirks, should they
>>>>> pop up
>>>>> (e.g. special timing requirements, hardware bugs).  We don't
>>>>> know in
>>>>> advance if they will be discovered, but if they are, it's
>>>>> cumbersome
>>>>> to determine after the fact which products (and thus DTs) are
>>>>> affected.
>>>>> So having the name of the actual chip used on the board has
>>>>> value.
>>>>
>>>> So you say devices are compatible. Then the second patch is
>>>> wrong.
>>>>
>>>> I cannot respond to it, though... so NAK-here-for-second-patch.
>>>
>>> I disagree.  It's ugly to have inconsistencies between the DT
>>> bindings
>>> and the driver.  So I think patch [1/2] in this series is fine.
>>
>> You are mixing different things. This patchset creates inconsistency.
>> You even refer here to bindings while we discuss the driver...
>>
>> Why this one driver is different than all other Linux drivers? Why do
>> you keep pushing here entirely different behavior?
>>
>> The devices are compatible, so growing match table is both redundant
>> and
>> confusing. That's everywhere. TPM is not different.
>>
>> Best regards,
>> Krzysztof
>>
> 
> Sorry for the mistakes made (kernel noob).
> I made the patch for the driver analogous to the i2c-tpm of
> infineon,slb9673 and nuvoton,npct75x. In the discussion I realize that
> the compatibility is a duplication and should not be extended.
> 
> I now adjust the following in the series:
> - correct cc receiver list
> - delete driver patch with compatibility extension
> - change commit title to "dt-bindings: tpm: Add st,st33ktpm2xi2c"

Thanks.

Best regards,
Krzysztof