linux-kernel - Re: [PATCH v4 1/7] dt-bindings: arm: fsl: add se-fw binding doc

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Date:   Wed, 12 Jul 2023 20:34:53 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Conor Dooley <conor@...nel.org>,
        Pankaj Gupta <pankaj.gupta@....com>
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        clin@...e.com, conor+dt@...nel.org, pierre.gondois@....com,
        ping.bai@....com, xiaoning.wang@....com, wei.fang@....com,
        peng.fan@....com, haibo.chen@....com, festevam@...il.com,
        linux-imx@....com, davem@...emloft.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, gaurav.jain@....com,
        alexander.stein@...tq-group.com, sahil.malhotra@....com,
        aisheng.dong@....com, V.Sethi@....com
Subject: Re: [PATCH v4 1/7] dt-bindings: arm: fsl: add se-fw binding doc

On 12/07/2023 20:26, Conor Dooley wrote:
> Hey,
> 
> On Wed, Jul 12, 2023 at 05:42:13PM +0530, Pankaj Gupta wrote:
>> The NXP's i.MX EdgeLock Enclave, a HW IP creating an embedded
>> secure enclave within the SoC boundary to enable features like
>> - HSM
>> - SHE
>> - V2X
>>
>> Communicates via message unit with linux kernel. This driver
>> is 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 can communicate on single MU.
>>
>> It exists on some i.MX processors. e.g. i.MX8ULP, i.MX93 etc.
>>
>> Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
>> ---
>>  .../bindings/arm/freescale/fsl,se-fw.yaml     | 121 ++++++++++++++++++
>>  1 file changed, 121 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,se-fw.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,se-fw.yaml b/Documentation/devicetree/bindings/arm/freescale/fsl,se-fw.yaml
>> new file mode 100644
>> index 000000000000..7567da0b4c21
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,se-fw.yaml
>> @@ -0,0 +1,121 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/arm/freescale/fsl,se-fw.yaml#
> 
> I think on v3 you were asked to use a filename that matches the
> compatibles?
> 
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NXP i.MX EdgeLock Enclave Firmware (ELEFW)
>> +
>> +maintainers:
>> +  - Pankaj Gupta <pankaj.gupta@....com>
> 
>> +  value, i.e., supported SoC(s) are imx8ulp, imx93.
> 
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - fsl,imx-ele
> 
> This looks like a generic compatible, not a specific one, but you use it
> on the imx8ulp. I would have expected that you would have something like
> "fsl,imx8ulp-ele" for that.

Yeah, this one looks generic, so not what we expect.

> 
>> +      - fsl,imx93-ele
> 
> 
>> +
>> +  mboxes:
>> +    description:
>> +      A list of phandles of TX MU channels followed by a list of phandles of
>> +      RX MU channels. The number of expected tx and rx channels is 1 TX, and
>> +      1 RX channels. 

Don't repeat constraints in free form text. This is obvious from the
items below.


Best regards,
Krzysztof