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Message-ID: <bbe365cd-698e-4507-b5e6-d7dd4dcc7a75@linaro.org>
Date: Sat, 13 Apr 2024 12:53:25 +0200
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Subject: Re: [PATCH 2/2] dt-bindings: tpm: Add st,st33ktpm2xi2c to TCG TIS
 binding
To: Lukas Wunner <lukas@wunner.de>
Cc: "M. Haener" <michael.haener@siemens.com>,
 linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
 Peter Huewe <peterhuewe@gmx.de>, Jarkko Sakkinen <jarkko@kernel.org>,
 Jason Gunthorpe <jgg@ziepe.ca>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Alexander Sverdlin <alexander.sverdlin@siemens.com>
References: <20240413071621.12509-1-michael.haener@siemens.com>
 <20240413071621.12509-3-michael.haener@siemens.com>
 <8c13a349-a721-44d3-9e23-2e01f4c2ca4d@linaro.org>
 <Zhpb2URMxuoilKAZ@wunner.de>
 <3d08cf54-f58f-446f-977e-21ba65986924@linaro.org>
 <ZhpfwaIUc0HpfZP1@wunner.de>
 <889ca65c-c9c7-4658-9c34-5d89774218cc@linaro.org>
 <ZhpjozjbeWrb0OTl@wunner.de>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <ZhpjozjbeWrb0OTl@wunner.de>
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On 13/04/2024 12:51, Lukas Wunner wrote:
> On Sat, Apr 13, 2024 at 12:43:38PM +0200, Krzysztof Kozlowski wrote:
>> On 13/04/2024 12:34, Lukas Wunner wrote:
>>> The other patch just adds an entry to of_tis_i2c_match[] in the driver,
>>> pretty unspectacular:
>>>
>>> https://lore.kernel.org/all/20240413071621.12509-2-michael.haener@siemens.com/
>>
>> Then why is it needed?
> 
> 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.

Best regards,
Krzysztof