RE: [EXT] Re: [PATCH v3 2/5] dt-bindings: arm: fsl: add imx-se-fw binding doc

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> -----Original Message-----
> From: Conor Dooley <conor@xxxxxxxxxx>
> Sent: Monday, June 17, 2024 10:07 PM
> To: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> Cc: Jonathan Corbet <corbet@xxxxxxx>; Rob Herring <robh@xxxxxxxxxx>;
> Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>; Conor Dooley
> <conor+dt@xxxxxxxxxx>; Shawn Guo <shawnguo@xxxxxxxxxx>; Sascha Hauer
> <s.hauer@xxxxxxxxxxxxxx>; Pengutronix Kernel Team
> <kernel@xxxxxxxxxxxxxx>; Fabio Estevam <festevam@xxxxxxxxx>; Rob
> Herring <robh+dt@xxxxxxxxxx>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@xxxxxxxxxx>; linux-doc@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; imx@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH v3 2/5] dt-bindings: arm: fsl: add imx-se-fw binding
> doc
> 
> On Mon, Jun 17, 2024 at 12:59:40PM +0530, Pankaj Gupta wrote:
> > The NXP security hardware IP(s) like: i.MX EdgeLock Enclave, V2X etc.,
> > creates an embedded secure enclave within the SoC boundary to enable
> > features like:
> > - HSM
> > - SHE
> > - V2X
> >
> > Secure-Enclave(s) communication interface are typically via message
> > unit, i.e., based on mailbox linux kernel driver. This driver enables
> > communication ensuring well defined message sequence protocol between
> > Application Core and enclave's firmware.
> >
> > Driver configures multiple misc-device on the MU, for multiple
> > user-space applications, to be able to communicate over single MU.
> >
> > It exists on some i.MX processors. e.g. i.MX8ULP, i.MX93 etc.
> >
> > Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> > ---
> >  .../devicetree/bindings/firmware/fsl,imx-se.yaml   | 160
> +++++++++++++++++++++
> >  1 file changed, 160 insertions(+)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/firmware/fsl,imx-se.yaml
> > b/Documentation/devicetree/bindings/firmware/fsl,imx-se.yaml
> > new file mode 100644
> > index 000000000000..60ad1c4a3dfa
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/firmware/fsl,imx-se.yaml
> > @@ -0,0 +1,160 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/firmware/fsl,imx-se.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: NXP i.MX HW Secure Enclave(s) EdgeLock Enclave
> > +
> > +maintainers:
> > +  - Pankaj Gupta <pankaj.gupta@xxxxxxx>
> > +
> > +description: |
> > +  NXP's SoC may contain one or multiple embedded secure-enclave HW
> > +  IP(s) like i.MX EdgeLock Enclave, V2X etc. These NXP's HW IP(s)
> > +  enables features like
> > +    - Hardware Security Module (HSM),
> > +    - Security Hardware Extension (SHE), and
> > +    - Vehicular to Anything (V2X)
> > +
> > +  Communication interface to the secure-enclaves is based on the
> > + messaging unit(s).
> > +
> > +properties:
> > +  $nodename:
> > +    pattern: "^[0-9a-z]*-if@[0-9a-f]+$"
> 
> Just "firmware@<hex>" please.
> 

Modified as per your suggestion, 
-    pattern: "^[0-9a-z]*-if@[0-9a-f]+$"
+    pattern: "^[0-9a-z]*-if@<hex>"

encountering the following error:
/home/yuktilab/linux_bkp/Documentation/devicetree/bindings/firmware/fsl,imx-se.example.dtb: ele-if@0: $nodename:0: 'ele-if@0' does not match '^[0-9a-z]*-if@<hex>'
	from schema $id: http://devicetree.org/schemas/firmware/fsl,imx-se.yaml#
/home/yuktilab/linux_bkp/Documentation/devicetree/bindings/firmware/fsl,imx-se.example.dtb: v2x-if@3: $nodename:0: 'v2x-if@3' does not match '^[0-9a-z]*-if@<hex>'
	from schema $id: http://devicetree.org/schemas/firmware/fsl,imx-se.yaml#
/home/yuktilab/linux_bkp/Documentation/devicetree/bindings/firmware/fsl,imx-se.example.dtb: v2x-if@4: $nodename:0: 'v2x-if@4' does not match '^[0-9a-z]*-if@<hex>'
	from schema $id: http://devicetree.org/schemas/firmware/fsl,imx-se.yaml#
/home/yuktilab/linux_bkp/Documentation/devicetree/bindings/firmware/fsl,imx-se.example.dtb: v2x-if@5: $nodename:0: 'v2x-if@5' does not match '^[0-9a-z]*-if@<hex>'
	from schema $id: http://devicetree.org/schemas/firmware/fsl,imx-se.yaml#

Please help and guide to resolve this comment, correctly.
Highly appreciated. Thanks.

> > +
> > +  compatible:
> > +    enum:
> > +      - fsl,imx8ulp-se
> > +      - fsl,imx93-se
> > +      - fsl,imx95-se
> > +
> > +  reg:
> > +    maxItems: 1
> > +    description: Identifier of the communication interface to secure-enclave.
> > +
> > +  mboxes:
> > +    description: contain a list of phandles to mailboxes.
> > +    items:
> > +      - description: Specify the mailbox used to send message to se firmware
> > +      - description: Specify the mailbox used to receive message from
> > + se firmware
> > +
> > +  mbox-names:
> > +    items:
> > +      - const: tx
> > +      - const: rx
> > +      - const: txdb
> > +      - const: rxdb
> > +    minItems: 2
> > +
> > +  memory-region:
> > +    description: contains a list of phandles to reserved external memory.
> > +    items:
> > +      - description: It is used by secure-enclave firmware. It is an optional
> > +          property based on compatible and identifier to communication
> interface.
> > +          (see bindings/reserved-memory/reserved-memory.txt)
> > +
> > +  sram:
> > +    description: contains a list of phandles to sram.
> 
> There's only 1 phandle allowed, don't describe it as a list.
> Same for memory-region.

Accepted. Will do the following changes.
   memory-region:
-    description: contains a list of phandles to reserved external memory.
+    description: contains the phandle to reserved external memory.

   sram:
-    description: contains a list of phandles to sram.
-    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: contains the phandle to sram.
     items:
> 
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    items:
> > +      - description: Phandle to the device SRAM. It is an optional property
> > +          based on compatible and identifier to communication interface.
> > +
> > +allOf:
> > +  # memory-region
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - fsl,imx8ulp-se
> > +              - fsl,imx93-se
> > +    then:
> > +      required:
> > +        - memory-region
> 
> > +    else:
> > +      not:
> > +        required:
> > +          - memory-region
> 
> Use
> 
> else: properties: memory-region: false
> 
> Same for sram. 
Accepted will be corrected in V4.
# memory-region
-      not:
-        required:
-          - memory-region
+      properties:
+        memory-region: false
 
   # sram
     else:
-      not:
-        required:
-          - sram
+      properties:
+        sram: false


> Sort the allOf after required.
Accepted. Will move allOf after "additionalProperties:"

> 
> > +
> > +  # sram
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - fsl,imx8ulp-se
> > +    then:
> > +      required:
> > +        - sram
> > +    else:
> > +      not:
> > +        required:
> > +          - sram
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - mboxes
> > +  - mbox-names
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    firmware {
> 
> You've made up these firmware "buses" here, what purpose do they serve,
> other than allowing you to have a reg property?
True.
Additionally, these are firmware nodes, these nodes are semantically put in firmware "buses".

> 
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      ele-if@0 {
> > +        compatible = "fsl,imx8ulp-se";
> > +        reg = <0x0>;
> 
> What does the reg property even do? Is it ever more than 0? 
> Can this information be provided as a mbox cell?
Yes, there are more than 0 nodes for i.MX95 platforms, i.e., total of around 7 such nodes.
Reg property will help to identify the node id, by other kernel management layer like NVMEM (patches to follow).

> 
> > +        mboxes = <&s4muap 0 0>, <&s4muap 1 0>;
> > +        mbox-names = "tx", "rx";
> > +        sram = <&sram0>;
> > +        memory-region = <&ele_reserved>;
> > +      };
> > +    };
> > +  - |
> > +    firmware {
> 
> These examples are all basically the same, drop all but one.
Ok, will keep the example of i.MX95.

> 
> Thanks,
> Conor.
> 
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      ele-if@0 {
> > +        compatible = "fsl,imx93-se";
> > +        reg = <0x0>;
> > +        mboxes = <&s4muap 0 0>, <&s4muap 1 0>;
> > +        mbox-names = "tx", "rx";
> > +        memory-region = <&ele_reserved>;
> > +      };
> > +    };
> > +  - |
> > +    firmware {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      ele-if@0 {
> > +        compatible = "fsl,imx95-se";
> > +        reg = <0x0>;
> > +        mboxes = <&ele_mu0 0 0>, <&ele_mu0 1 0>;
> > +        mbox-names = "tx", "rx";
> > +      };
> > +      v2x-if@3 {
> > +        compatible = "fsl,imx95-se";
> > +        reg = <0x3>;
> > +        mboxes = <&v2x_mu 0 0>, <&v2x_mu 1 0>;
> > +        mbox-names = "tx", "rx";
> > +      };
> > +      v2x-if@4 {
> > +        compatible = "fsl,imx95-se";
> > +        reg = <0x4>;
> > +        mboxes = <&v2x_mu6 0 0>, <&v2x_mu6 1 0>;
> > +        mbox-names = "tx", "rx";
> > +      };
> > +      v2x-if@5 {
> > +        compatible = "fsl,imx95-se";
> > +        reg = <0x5>;
> > +        mboxes = <&v2x_mu7 0 0>, <&v2x_mu7 1 0>;
> > +        mbox-names = "tx", "rx";
> > +      };
> > +    };
> > +...
> >
> > --
> > 2.34.1
> >





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