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

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Date: Sat, 13 Apr 2024 12:56:13 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: "M. Haener" <michael.haener@...mens.com>,
	linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alexander Sverdlin <alexander.sverdlin@...mens.com>
Subject: Re: [PATCH 2/2] dt-bindings: tpm: Add st,st33ktpm2xi2c to TCG TIS
 binding

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.

Thanks,

Lukas