Re: Device tree usage in TF-A & OP-Tee consultation

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On Wed, Aug 16, 2023 at 9:57 AM Simon Glass <sjg@xxxxxxxxxxxx> wrote:
>
> Hi Yi,
>
> On Tue, 15 Aug 2023 at 17:58, Yi Chou <yich@xxxxxxxxxxxx> wrote:
> >
> > On Tue, Aug 15, 2023 at 10:44 PM Simon Glass <sjg@xxxxxxxxxxxx> wrote:
> > >
> > > Hi,
> > >
> > > On Thu, 10 Aug 2023 at 01:39, Yi Chou <yich@xxxxxxxxxxxx> wrote:
> > > >
> > > > On Wed, Aug 9, 2023 at 10:58 PM Rob Herring <robh@xxxxxxxxxx> wrote:
> > > > >
> > > > > On Tue, Aug 8, 2023 at 2:08 AM Yi Chou <yich@xxxxxxxxxxxx> wrote:
> > > > > >
> > > > > > On Wed, Jul 26, 2023 at 12:37 AM Rob Herring <robh@xxxxxxxxxx> wrote:
> > > > > > >
> > > > > > > On Tue, Jul 25, 2023 at 8:52 AM Simon Glass <sjg@xxxxxxxxxxxx> wrote:
> > > > > > > >
> > > > > > > > On Mon, 24 Jul 2023 at 04:02, Yi Chou <yich@xxxxxxxxxxxx> wrote:
> > > > > > > > >
> > > > > > > > > Sorry for the late reply,
> > > > > > > > > this is the new version that moved the bindings to the /options node.
> > > > > > > > >
> > > > > > > > > From 1662ec6c6a9cbb07d83157ad9411897b4acaf1f0 Mon Sep 17 00:00:00 2001
> > > > > > > > > From: Yi Chou <yich@xxxxxxxxxx>
> > > > > > > > > Date: Wed, 14 Jun 2023 14:49:46 +0800
> > > > > > > > > Subject: [PATCH] dt-bindings: Add Google Widevine initialize parameters
> > > > > > > > >
> > > > > > > > > The necessary fields to initialize the widevine related functions in
> > > > > > > > > OP-TEE.
> > > > > > > > >
> > > > > > > > > Change-Id: Iceb6c533bcb60034e811d4fdf9310d9df48507de
> > > > > > > > > Signed-off-by: Yi Chou <yich@xxxxxxxxxx>
> > > > > > > > > ---
> > > > > > > > >  .../bindings/options/google,widevine.yaml     | 61 +++++++++++++++++++
> > > > > > > > >  1 file changed, 61 insertions(+)
> > > > > > > > >  create mode 100644
> > > > > > > > > Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > > > >
> > > > > > > > > diff --git a/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > > > > b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > > > > new file mode 100644
> > > > > > > > > index 0000000000000..acfc96d162c88
> > > > > > > > > --- /dev/null
> > > > > > > > > +++ b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > > > > @@ -0,0 +1,61 @@
> > > > > > > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > > > > > > +%YAML 1.2
> > > > > > > > > +---
> > > > > > > > > +$id: http://devicetree.org/schemas/options/google,widevine.yaml#
> > > > > > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > > > > > > +
> > > > > > > > > +title: Google Widevine initialize parameters.
> > > > > > > > > +
> > > > > > > > > +maintainers:
> > > > > > > > > +  - Jeffrey Kardatzke <jkardatzke@xxxxxxxxxxxx>
> > > > > > > > > +  - Yi Chou <yich@xxxxxxxxxxxx>
> > > > > > > > > +
> > > > > > > > > +description:
> > > > > > > > > +  The necessary fields to initialize the widevine related functions in
> > > > > > > > > +  OP-TEE. This node does not represent a real device, but serves as a
> > > > > > > > > +  place for passing data between firmware and OP-TEE.
> > > > > > > > > +
> > > > > > > > > +properties:
> > > > > > > > > +  compatible:
> > > > > > > > > +    const: google,widevine
> > > > > > > > > +
> > > > > > > > > +  huk:
> > > > > > > > > +    $ref: /schemas/types.yaml#/definitions/string
> > > > > > > > > +    description:
> > > > > > > > > +      The encryption key of the Widevine OP-TEE storage.
> > > > > > > > > +
> > > > > > > > > +  tpm-auth-pk:
> > > > > > > > > +    $ref: /schemas/types.yaml#/definitions/string
> > > > > > > > > +    description:
> > > > > > > > > +      The TPM auth public key. Used to communicate the TPM from OP-TEE.
> > > > > > > >
> > > > > > > > Can you add more details about this key. What format is it in? How is
> > > > > > > > it created?
> > > > > > > >
> > > > > > > > > +
> > > > > > > > > +  widevine-dice:
> > > > > > > >
> > > > > > > > We should avoid the 'widevine-' prefix since it is already this node.
> > > > > > >
> > > > > > > Yes, but then 'dice' is pretty vague. It is preferred that property
> > > > > > > names are unique enough to only have 1 type globally (at least within
> > > > > > > a defined size). This allows using the schemas to decode DT data.
> > > > > > >
> > > > > > > >
> > > > > > > > I don't know what the words mean in the description, so I cannot offer
> > > > > > > > a better idea.
> > > > > > > >
> > > > > > > > > +    $ref: /schemas/types.yaml#/definitions/string
> > > > > > > > > +    description:
> > > > > > > > > +      The Widevine boot certificate chain(Device Identifier Composition
> > > > > > > > > +      Engine) of this device. Used to provision the device status with
> > > > > > > > > +      the Widevine server in OP-TEE.
> > > > > > > >
> > > > > > > > Ditto
> > > > > > > >
> > > > > > > > > +
> > > > > > > > > +  widevine-ta-key:
> > > > > > > >
> > > > > > > > As above
> > > > > > > > > +    $ref: /schemas/types.yaml#/definitions/string
> > > > > > > > > +    description:
> > > > > > > > > +      The Widevine private key corresponding to the widevine-dice.
> > > > > > > > > +      Used to signing the widevine request in OP-TEE.
> > > > > > > >
> > > > > > > > Again, more details please
> > > > > > > >
> > > > > > > > > +
> > > > > > > > > +required:
> > > > > > > > > +  - compatible
> > > > > > >
> > > > > > > What's the point of this binding if none of the other properties are required?
> > > > > > >
> > > > > > > > > +
> > > > > > > > > +additionalProperties: false
> > > > > > > > > +
> > > > > > > > > +examples:
> > > > > > > > > +  - |+
> > > > > > > > > +    options {
> > > > > > > > > +      widevine: {
> > > > > > > > > +        compatible = "google,widevine";
> > > > > > > > > +
> > > > > > > > > +        huk = [00 de ad be af aa bb cc],
> > > > > > > > > +        tpm-auth-pk = [00 de ad be af aa bb cc],
> > > > > > > > > +        widevine-dice = [00 de ad be af aa bb cc],
> > > > > > > > > +        widevine-ta-key = [00 de ad be af aa bb cc],
> > > > > > > > > +      };
> > > > > > > > > +    };
> > > > > > > > > --
> > > > > > > > > 2.39.2
> > > > > > > > >
> > > > > > > >
> > > > > > > > [..]
> > > > > > > >
> > > > > > > > Regards,
> > > > > > > > Simon
> > > > > >
> > > > > > Sorry for the late reply.
> > > > > > We changed the internal format of the "widevine-dice" from COSE to
> > > > > > X.509 recently.
> > > > > > And here is the new patch with the corresponding changes.
> > > > > >
> > > > > > From 9f754c8872c411e3e4216a181b4028875f1f54fc Mon Sep 17 00:00:00 2001
> > > > > > From: Yi Chou <yich@xxxxxxxxxx>
> > > > > > Date: Wed, 14 Jun 2023 14:49:46 +0800
> > > > > > Subject: [PATCH] dt-bindings: Add Google Widevine initialize parameters
> > > > > >
> > > > > > The necessary fields to initialize the widevine related functions in
> > > > > > OP-TEE.
> > > > > >
> > > > > > Change-Id: Iceb6c533bcb60034e811d4fdf9310d9df48507de
> > > > > > Signed-off-by: Yi Chou <yich@xxxxxxxxxx>
> > > > > > ---
> > > > > > .../bindings/options/google,widevine.yaml | 63 +++++++++++++++++++
> > > > > > 1 file changed, 63 insertions(+)
> > > > > > create mode 100644
> > > > > > Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > >
> > > > > > diff --git a/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > new file mode 100644
> > > > > > index 0000000000000..874f62598b087
> > > > > > --- /dev/null
> > > > > > +++ b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > > > @@ -0,0 +1,63 @@
> > > > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > > > +%YAML 1.2
> > > > > > +---
> > > > > > +$id: http://devicetree.org/schemas/options/google,widevine.yaml#
> > > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > > > +
> > > > > > +title: Google Widevine initialize parameters.
> > > > > > +
> > > > > > +maintainers:
> > > > > > + - Jeffrey Kardatzke <jkardatzke@xxxxxxxxxxxx>
> > > > > > + - Yi Chou <yich@xxxxxxxxxxxx>
> > > > > > +
> > > > > > +description:
> > > > > > + The necessary fields to initialize the widevine related functions in
> > > > > > + OP-TEE. This node does not represent a real device, but serves as a
> > > > > > + place for passing data between firmware and OP-TEE.
> > > > > > +
> > > > > > +properties:
> > > > > > + compatible:
> > > > > > + const: google,widevine
> > > > >
> > > > > This isn't valid json-schema as the indentation is wrong. Please test
> > > > > your schema with the tools.
> > > > >
> > > > > > +
> > > > > > + huk:
> > > > >
> > > > > As mentioned previously, this is too vague.
> > > > >
> > > > > > + $ref: /schemas/types.yaml#/definitions/string
> > > > >
> > > > > Doesn't look like a string from the example.
> > > > >
> > > > > > + description:
> > > > > > + The encryption key of the Widevine OP-TEE storage. The length
> > > > > > + should be 32 bytes.
> > > > >
> > > > > Your example is 8 bytes.
> > > > >
> > > > > > +
> > > > > > + tpm-auth-pk:
> > > > > > + $ref: /schemas/types.yaml#/definitions/string
> > > > > > + description:
> > > > > > + The TPM auth public key. Used to communicate the TPM from OP-TEE.
> > > > > > + The format of data should be TPM2B_PUBLIC.
> > > > > > +
> > > > > > + rot:
> > > > > > + $ref: /schemas/types.yaml#/definitions/string
> > > > > > + description:
> > > > > > + The Widevine root of trust secret. Used to signing the widevine
> > > > > > + request in OP-TEE. The length should be 32 bytes.
> > > > > > +
> > > > > > + rot-cert:
> > > > > > + $ref: /schemas/types.yaml#/definitions/string
> > > > > > + description:
> > > > > > + The X.509 certificate of the Widevine root of trust on this
> > > > > > + device. Used to provision the device status with the Widevine
> > > > > > + server in OP-TEE.
> > > > > > +
> > > > > > +required:
> > > > > > + - compatible
> > > > > > + - huk
> > > > > > + - rot
> > > > > > +
> > > > > > +additionalProperties: false
> > > > > > +
> > > > > > +examples:
> > > > > > + - |+
> > > > > > + options {
> > > > > > + widevine: {
> > > > > > + compatible = "google,widevine";
> > > > > > +
> > > > > > + huk = [00 de ad be af aa bb cc],
> > > > > > + rot = [00 de ad be af aa bb cc],
> > > > > > + };
> > > > > > + };
> > > > > > --
> > > > > > 2.39.2
> > > > > >
> > > > > > Sincerely,
> > > > > > Yi
> > > >
> > > > Thanks for the reply, this is the new version of this patch.
> > > >
> > > > From 360c63617c8cd595da41b04430993b9d435b0865 Mon Sep 17 00:00:00 2001
> > > > From: Yi Chou <yich@xxxxxxxxxx>
> > > > Date: Wed, 14 Jun 2023 14:49:46 +0800
> > > > Subject: [PATCH] dt-bindings: Add Google Widevine initialize parameters
> > > >
> > > > The necessary fields to initialize the widevine related functions in
> > > > OP-TEE.
> > > >
> > > > Change-Id: Iceb6c533bcb60034e811d4fdf9310d9df48507de
> > > > Signed-off-by: Yi Chou <yich@xxxxxxxxxx>
> > > > ---
> > > >  .../bindings/options/google,widevine.yaml     | 68 +++++++++++++++++++
> > > >  1 file changed, 68 insertions(+)
> > > >  create mode 100644
> > > > Documentation/devicetree/bindings/options/google,widevine.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > new file mode 100644
> > > > index 0000000000000..e77e9ac5be29a
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > > > @@ -0,0 +1,68 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/options/google,widevine.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Google Widevine initialize parameters.
> > >
> > > 'initialization' would be better I think
> > >
> > > > +
> > > > +maintainers:
> > > > +  - Jeffrey Kardatzke <jkardatzke@xxxxxxxxxxxx>
> > > > +  - Yi Chou <yich@xxxxxxxxxxxx>
> > > > +
> > >
> > > The property names you have used seem good to me.
> > >
> > > > +description:
> > > > +  The necessary fields to initialize the widevine related functions in
> > > > +  OP-TEE. This node does not represent a real device, but serves as a
> > > > +  place for passing data between firmware and OP-TEE.
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    const: google,widevine
> > > > +
> > > > +  hardware-unique-key:
> > > > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > > > +    description:
> > > > +      The hardware unique key of the Widevine OP-TEE. It will be used
> > >
> > > hardware-unique key
> > >
> > > > +      to derive the secure storage key. The length should be 32 bytes.
> > >
> > > What is the format of this? Do you have a link?
> > >
> > > > +
> > > > +  tpm-auth-public-key:
> > > > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > > > +    description:
> > > > +      The TPM auth public key. Used to communicate the TPM from OP-TEE.
> > > > +      The format of data should be TPM2B_PUBLIC.
> > >
> > > Same here. I tried to look up TPM2B_PUBLIC but didn't get very far.
> > >
> > > If this is omitted, what does it mean?
> > >
> > > > +
> > > > +  root-of-trust:
> > > > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > > > +    description:
> > > > +      The Widevine root of trust secret. Used to sign the widevine
> > > > +      request in OP-TEE. The length should be 32 bytes.
> > >
> > > What is the format of this? Do you have a link?
> > >
> > > > +
> > > > +  root-of-trust-cert:
> > > > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > > > +    description:
> > > > +      The X.509 certificate of the Widevine root of trust on this
> > > > +      device. Used to provision the device status with the Widevine
> > > > +      server in OP-TEE.
> > >
> > > Which format is used for the X.509 certificate?
> > >
> > > If this is omitted, what does it mean?
> > >
> > > > +
> > > > +required:
> > > > +  - compatible
> > > > +  - hardware-unique-key
> > > > +  - root-of-trust
> > > > +
> > > > +additionalProperties: false
> > > > +
> > > > +examples:
> > > > +  - |+
> > > > +    options {
> > > > +      widevine {
> > > > +        compatible = "google,widevine";
> > > > +        hardware-unique-key = /bits/ 8 <
> > > > +          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
> > > > +          6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> > > > +        >;
> > > > +        root-of-trust = /bits/ 8 <
> > > > +          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
> > > > +          6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> > > > +        >;
> > >
> > > Can you please add the other fields to your example? Perhaps this
> > > would be better to use the [] encoding for the bytes?
> > >
> > > > +      };
> > > > +    };
> > > > --
> > > > 2.39.2
> > > >
> > > > Sincerely,
> > > > Yi
> > >
> > > Regards,
> > > Simon
> >
> > Thanks for the reply, I added more references of the format into the doc.
> > And also added examples of tpm-auth-public-key and root-of-trust-cert.
> >
> > From fb8fa5684a36e4b59a9543691cd17e201ab9a226 Mon Sep 17 00:00:00 2001
> > From: Yi Chou <yich@xxxxxxxxxx>
> > Date: Wed, 14 Jun 2023 14:49:46 +0800
> > Subject: [PATCH] dt-bindings: Add Google Widevine initialization parameters
> >
> > The necessary fields to initialize the widevine related functions in
> > OP-TEE.
> >
> > Change-Id: Iceb6c533bcb60034e811d4fdf9310d9df48507de
> > Signed-off-by: Yi Chou <yich@xxxxxxxxxx>
> > ---
> >  .../bindings/options/google,widevine.yaml     | 121 ++++++++++++++++++
> >  1 file changed, 121 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/options/google,widevine.yaml
>
> Reviewed-by: Simon Glass <sjg@xxxxxxxxxxxx>
>
> It still isn't clear to me why some fields are optional and some not,
> but at least we have the links now.
>
> >
> > diff --git a/Documentation/devicetree/bindings/options/google,widevine.yaml
> > b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > new file mode 100644
> > index 0000000000000..233f5756f2c48
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/options/google,widevine.yaml
> > @@ -0,0 +1,121 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/options/google,widevine.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Google Widevine initialization parameters.
> > +
> > +maintainers:
> > +  - Jeffrey Kardatzke <jkardatzke@xxxxxxxxxxxx>
> > +  - Yi Chou <yich@xxxxxxxxxxxx>
> > +
> > +description:
> > +  The necessary fields to initialize the widevine related functions in
> > +  OP-TEE. This node does not represent a real device, but serves as a
> > +  place for passing data between firmware and OP-TEE.
> > +
> > +properties:
> > +  compatible:
> > +    const: google,widevine
> > +
> > +  hardware-unique-key:
> > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > +    description: |
> > +      The hardware-unique key of the Widevine OP-TEE. It will be used
> > +      to derive the secure storage key. The length should be 32 bytes.
> > +      For more information, please reference:
> > +      https://optee.readthedocs.io/en/latest/architecture/porting_guidelines.html#hardware-unique-key
> > +
> > +  tpm-auth-public-key:
> > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > +    description: |
> > +      The TPM auth public key. Used to communicate the TPM from OP-TEE.
> > +      The format of data should be TPM2B_PUBLIC.
> > +      For more information, please reference the 12.2.5 section:
> > +      https://trustedcomputinggroup.org/wp-content/uploads/TCG_TPM2_r1p59_Part2_Structures_pub.pdf
> > +
> > +  root-of-trust:
> > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > +    description: |
> > +      The Widevine root of trust secret. Used to sign the widevine
> > +      request in OP-TEE. The length should be 32 bytes. The value
> > +      is an ECC NIST P-256 scalar.
> > +      For more information, please reference the G.1.2 section:
> > +      https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-186.pdf
> > +
> > +  root-of-trust-cert:
> > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > +    description: |
> > +      The X.509 certificate of the Widevine root of trust on this
> > +      device. Used to provision the device status with the Widevine
> > +      server in OP-TEE.
> > +      For more information, please reference:
> > +      https://www.itu.int/rec/T-REC-X.509
> > +
> > +required:
> > +  - compatible
> > +  - hardware-unique-key
> > +  - root-of-trust
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |+
> > +    options {
> > +      widevine {
> > +        compatible = "google,widevine";
> > +        hardware-unique-key = [
> > +          12 f7 98 d2 0e d2 85 92 a5 82 bf 98 b8 99 2b c0
> > +          c6 6f 19 85 79 86 65 18 55 eb ff 9b 6c c0 ac 27
> > +        ];
> > +        tpm-auth-public-key = [
> > +          00 76 00 23 00 0b 00 02 04 b2 00 20 e1 47 bf 27
> > +          e1 74 30 c8 16 ab 72 4d 5c 77 e1 5c 61 2d 56 81
> > +          b3 35 cd 9d eb 67 41 37 69 f0 32 41 00 10 00 10
> > +          00 03 00 10 00 20 70 9a df 50 f9 0f d5 f4 40 e0
> > +          ea 2c e8 f2 26 9f 0e 5c 02 70 16 c3 6c c1 83 03
> > +          2d 04 10 bd 85 7a 00 20 83 03 c2 66 6e 01 32 34
> > +          5c 5e 80 22 c7 48 24 3c 70 6b b8 e4 24 42 74 a9
> > +          cf fc ab f8 30 e9 de 51
> > +        ];
> > +        root-of-trust = [
> > +          ac 0d 86 c3 d7 b5 b7 a2 6f c3 d9 93 f7 de bc bb
> > +          d5 c4 25 9b 21 5f 36 af b5 dd 6d 29 9d 08 c0 10
> > +        ];
> > +        root-of-trust-cert = [
> > +          30 82 01 f4 30 82 01 9b a0 03 02 01 02 02 10 11
> > +          01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 30
> > +          0a 06 08 2a 86 48 ce 3d 04 03 02 30 0f 31 0d 30
> > +          0b 06 03 55 04 03 0c 04 54 69 35 30 30 22 18 0f
> > +          32 30 30 30 30 31 30 31 30 30 30 30 30 30 5a 18
> > +          0f 32 30 39 39 31 32 33 31 32 33 35 39 35 39 5a
> > +          30 0f 31 0d 30 0b 06 03 55 04 03 0c 04 54 69 35
> > +          30 30 59 30 13 06 07 2a 86 48 ce 3d 02 01 06 08
> > +          2a 86 48 ce 3d 03 01 07 03 42 00 04 ec ef cb 0c
> > +          68 7e 30 f4 d5 8f 2c 88 16 f4 7f b5 8b 5b 06 77
> > +          d7 47 fe 1e 91 4c a3 c5 a1 54 f5 40 9c f8 a5 4e
> > +          85 a0 fa 05 1a 01 98 da e4 b1 e5 ff 95 0d cf 8f
> > +          d9 c1 ce 28 0f 91 75 ca 06 e4 91 3b a3 81 d4 30
> > +          81 d1 30 1a 06 0a 2b 06 01 04 01 d6 79 02 01 21
> > +          04 0c 5a 53 5a 56 a5 ac a5 a9 7f 7f 00 00 30 0f
> > +          06 0a 2b 06 01 04 01 d6 79 02 01 22 04 01 21 30
> > +          2e 06 0a 2b 06 01 04 01 d6 79 02 01 23 04 20 23
> > +          e1 4d d9 bb 51 a5 0e 16 91 1f 7e 11 df 1e 1a af
> > +          0b 17 13 4d c7 39 c5 65 36 07 a1 ec 8d d3 7a 30
> > +          2e 06 0a 2b 06 01 04 01 d6 79 02 01 24 04 20 00
> > +          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > +          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30
> > +          2e 06 0a 2b 06 01 04 01 d6 79 02 01 25 04 20 00
> > +          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > +          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30
> > +          12 06 0a 2b 06 01 04 01 d6 79 02 01 26 04 04 00
> > +          00 00 00 30 0a 06 08 2a 86 48 ce 3d 04 03 02 03
> > +          47 00 30 44 02 20 62 a8 d3 23 db 1e 9c 64 91 49
> > +          45 5e b3 49 8d cc 1a ae 76 70 e3 12 d2 25 65 69
> > +          df f1 7e bc 4b d8 02 20 25 99 7c 36 cb b3 fd ce
> > +          6e 84 ee d7 ea eb 05 cf 69 cf 72 75 20 f3 ba 7f
> > +          8b 9f 06 f3 e4 11 bc cd
> > +        ];
> > +      };
> > +    };
> > --
> > 2.39.2
> >
> > Sincerely,
> > Yi
>
> Regards,
> Simon

Thanks, I added a small section about why those public fields can be
ignored in the description.
We might want to omit those public fields to improve the boot time in
the future.

>From 39975741d2a7380aa65e43a449af90d496e800cf Mon Sep 17 00:00:00 2001
From: Yi Chou <yich@xxxxxxxxxx>
Date: Wed, 14 Jun 2023 14:49:46 +0800
Subject: [PATCH] dt-bindings: Add Google Widevine initialization parameters

The necessary fields to initialize the widevine related functions in
OP-TEE.

Change-Id: Iceb6c533bcb60034e811d4fdf9310d9df48507de
Signed-off-by: Yi Chou <yich@xxxxxxxxxx>
Reviewed-by: Simon Glass <sjg@xxxxxxxxxxxx>
---
 .../bindings/options/google,widevine.yaml     | 124 ++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644
Documentation/devicetree/bindings/options/google,widevine.yaml

diff --git a/Documentation/devicetree/bindings/options/google,widevine.yaml
b/Documentation/devicetree/bindings/options/google,widevine.yaml
new file mode 100644
index 0000000000000..8e1f0a252b18c
--- /dev/null
+++ b/Documentation/devicetree/bindings/options/google,widevine.yaml
@@ -0,0 +1,124 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/options/google,widevine.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Widevine initialization parameters.
+
+maintainers:
+  - Jeffrey Kardatzke <jkardatzke@xxxxxxxxxxxx>
+  - Yi Chou <yich@xxxxxxxxxxxx>
+
+description:
+  The necessary fields to initialize the widevine related functions in
+  OP-TEE. This node does not represent a real device, but serves as a
+  place for passing data between firmware and OP-TEE.
+  The public fields (e.g. tpm-auth-public-key & root-of-trust-cert) can
+  be ignored because it's safe to pass the public information with the
+  other methods(e.g. userland OP-TEE plugins).
+
+properties:
+  compatible:
+    const: google,widevine
+
+  hardware-unique-key:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description: |
+      The hardware-unique key of the Widevine OP-TEE. It will be used
+      to derive the secure storage key. The length should be 32 bytes.
+      For more information, please reference:
+      https://optee.readthedocs.io/en/latest/architecture/porting_guidelines.html#hardware-unique-key
+
+  tpm-auth-public-key:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description: |
+      The TPM auth public key. Used to communicate the TPM from OP-TEE.
+      The format of data should be TPM2B_PUBLIC.
+      For more information, please reference the 12.2.5 section:
+      https://trustedcomputinggroup.org/wp-content/uploads/TCG_TPM2_r1p59_Part2_Structures_pub.pdf
+
+  root-of-trust:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description: |
+      The Widevine root of trust secret. Used to sign the widevine
+      request in OP-TEE. The length should be 32 bytes. The value
+      is an ECC NIST P-256 scalar.
+      For more information, please reference the G.1.2 section:
+      https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-186.pdf
+
+  root-of-trust-cert:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description: |
+      The X.509 certificate of the Widevine root of trust on this
+      device. Used to provision the device status with the Widevine
+      server in OP-TEE.
+      For more information, please reference:
+      https://www.itu.int/rec/T-REC-X.509
+
+required:
+  - compatible
+  - hardware-unique-key
+  - root-of-trust
+
+additionalProperties: false
+
+examples:
+  - |+
+    options {
+      widevine {
+        compatible = "google,widevine";
+        hardware-unique-key = [
+          12 f7 98 d2 0e d2 85 92 a5 82 bf 98 b8 99 2b c0
+          c6 6f 19 85 79 86 65 18 55 eb ff 9b 6c c0 ac 27
+        ];
+        tpm-auth-public-key = [
+          00 76 00 23 00 0b 00 02 04 b2 00 20 e1 47 bf 27
+          e1 74 30 c8 16 ab 72 4d 5c 77 e1 5c 61 2d 56 81
+          b3 35 cd 9d eb 67 41 37 69 f0 32 41 00 10 00 10
+          00 03 00 10 00 20 70 9a df 50 f9 0f d5 f4 40 e0
+          ea 2c e8 f2 26 9f 0e 5c 02 70 16 c3 6c c1 83 03
+          2d 04 10 bd 85 7a 00 20 83 03 c2 66 6e 01 32 34
+          5c 5e 80 22 c7 48 24 3c 70 6b b8 e4 24 42 74 a9
+          cf fc ab f8 30 e9 de 51
+        ];
+        root-of-trust = [
+          ac 0d 86 c3 d7 b5 b7 a2 6f c3 d9 93 f7 de bc bb
+          d5 c4 25 9b 21 5f 36 af b5 dd 6d 29 9d 08 c0 10
+        ];
+        root-of-trust-cert = [
+          30 82 01 f4 30 82 01 9b a0 03 02 01 02 02 10 11
+          01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 30
+          0a 06 08 2a 86 48 ce 3d 04 03 02 30 0f 31 0d 30
+          0b 06 03 55 04 03 0c 04 54 69 35 30 30 22 18 0f
+          32 30 30 30 30 31 30 31 30 30 30 30 30 30 5a 18
+          0f 32 30 39 39 31 32 33 31 32 33 35 39 35 39 5a
+          30 0f 31 0d 30 0b 06 03 55 04 03 0c 04 54 69 35
+          30 30 59 30 13 06 07 2a 86 48 ce 3d 02 01 06 08
+          2a 86 48 ce 3d 03 01 07 03 42 00 04 ec ef cb 0c
+          68 7e 30 f4 d5 8f 2c 88 16 f4 7f b5 8b 5b 06 77
+          d7 47 fe 1e 91 4c a3 c5 a1 54 f5 40 9c f8 a5 4e
+          85 a0 fa 05 1a 01 98 da e4 b1 e5 ff 95 0d cf 8f
+          d9 c1 ce 28 0f 91 75 ca 06 e4 91 3b a3 81 d4 30
+          81 d1 30 1a 06 0a 2b 06 01 04 01 d6 79 02 01 21
+          04 0c 5a 53 5a 56 a5 ac a5 a9 7f 7f 00 00 30 0f
+          06 0a 2b 06 01 04 01 d6 79 02 01 22 04 01 21 30
+          2e 06 0a 2b 06 01 04 01 d6 79 02 01 23 04 20 23
+          e1 4d d9 bb 51 a5 0e 16 91 1f 7e 11 df 1e 1a af
+          0b 17 13 4d c7 39 c5 65 36 07 a1 ec 8d d3 7a 30
+          2e 06 0a 2b 06 01 04 01 d6 79 02 01 24 04 20 00
+          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30
+          2e 06 0a 2b 06 01 04 01 d6 79 02 01 25 04 20 00
+          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30
+          12 06 0a 2b 06 01 04 01 d6 79 02 01 26 04 04 00
+          00 00 00 30 0a 06 08 2a 86 48 ce 3d 04 03 02 03
+          47 00 30 44 02 20 62 a8 d3 23 db 1e 9c 64 91 49
+          45 5e b3 49 8d cc 1a ae 76 70 e3 12 d2 25 65 69
+          df f1 7e bc 4b d8 02 20 25 99 7c 36 cb b3 fd ce
+          6e 84 ee d7 ea eb 05 cf 69 cf 72 75 20 f3 ba 7f
+          8b 9f 06 f3 e4 11 bc cd
+        ];
+      };
+    };
--
2.39.2

Sincerely,
Yi




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