linux-hardening - Re: [PATCH v1 2/8] dt-bindings: tpm: Add schema for TIS I2C devices

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Date: Thu, 14 Dec 2023 14:13:04 -0600
From: Rob Herring <robh+dt@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: Ninad Palsule <ninad@...ux.ibm.com>, krzysztof.kozlowski+dt@...aro.org, 
	conor+dt@...nel.org, joel@....id.au, andrew@...econstruct.com.au, 
	peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca, keescook@...omium.org, 
	tony.luck@...el.com, gpiccoli@...lia.com, johannes.holland@...ineon.com, 
	linux@...ck-us.net, broonie@...nel.org, patrick.rudolph@...ements.com, 
	vincent@...emblay.dev, peteryin.openbmc@...il.com, lakshmiy@...ibm.com, 
	bhelgaas@...gle.com, naresh.solanki@...ements.com, 
	alexander.stein@...tq-group.com, festevam@...x.de, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
	linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org, 
	linux-hardening@...r.kernel.org, geissonator@...oo.com
Subject: Re: [PATCH v1 2/8] dt-bindings: tpm: Add schema for TIS I2C devices

On Thu, Dec 14, 2023 at 10:35 AM Conor Dooley <conor@...nel.org> wrote:
>
> On Thu, Dec 14, 2023 at 09:34:39AM -0600, Ninad Palsule wrote:
> > Hello Conor,
> >
> > On 12/12/23 11:14, Conor Dooley wrote:
> > > Hey,
> > >
> > > On Tue, Dec 12, 2023 at 10:39:58AM -0600, Ninad Palsule wrote:
> > > > From: Johannes Holland <johannes.holland@...ineon.com>
> > > >
> > > > Add a dt schema to support device tree bindings
> > > "Add bindings for..."
> > Fixed.
> > >
> > > > for the generic I2C
> > > > physical layer. Refer to the TCG PC Client Platform TPM Profile (PTP)
> > > > Specification for TPM 2.0 v1.04 Revision 14.
> > > >
> > > > This includes descriptions for the Nuvoton and Infineon devices.
> > > >
> > > > OpenBMC-Staging-Count: 3
> > > I have no idea what this is, but it needs to be removed from the patch.
> > Removed.
> > >
> > > > Signed-off-by: Johannes Holland <johannes.holland@...ineon.com>
> > > > Signed-off-by: Joel Stanley <joel@....id.au>
> > > > Signed-off-by: Ninad Palsule <ninad@...ux.ibm.com>
> > > > ---
> > > >   .../bindings/security/tpm/tpm-tis-i2c.yaml    | 50 +++++++++++++++++++
> > > >   1 file changed, 50 insertions(+)
> > > >   create mode 100644 Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml b/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
> > > > new file mode 100644
> > > > index 000000000000..de1e34065748
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
> > > > @@ -0,0 +1,50 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/security/tpm/tpm-tis-i2c.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: I2C PTP based TPM Devices
> > > > +
> > > > +maintainers:
> > > > +  - Johannes Holland <johannes.holland@...ineon.com>
> > > > +
> > > > +description:
> > > > +  Device Tree Bindings for I2C based Trusted Platform Module (TPM).
> > > s/Device Tree Bindings for //. Doesn't dt_binding_check now complain if
> > > you have this in a title or description?
> > Fixed.
> > >
> > > > +properties:
> > > > +  $nodename:
> > > > +    pattern: "^tpm(@[0-9a-f]+)?$"
> > > > +
> > > > +  compatible:
> > > > +    oneOf:
> > > > +      - description: Infineon's Trusted Platform Module (TPM) (SLB9673).
> > > > +        items:
> > > > +          - const: infineon,slb9673
> > > > +          - const: tcg,tpm-tis-i2c
> > > > +      - description: Nuvoton's Trusted Platform Module (TPM) (NPCT75x).
> > > > +        items:
> > > > +          - const: nuvoton,npct75x
> > > > +          - const: tcg,tpm-tis-i2c
>
> Also, another thought - the bus is not usually encoded in the compatible
> string, so it would be good to remove that.

True, but we already have 3 different bus variants in this case. So
that ship has sailed.

Rob