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

Conor Dooley
2024-06-24T16:49:01Z

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On Mon, Jun 24, 2024 at 01:46:19PM +0000, Pankaj Gupta wrote:
> Thanks Conor, for the help.
>
> Sorry to miss out this mail reply.
>
> > -----Original Message-----
> > From: Conor Dooley <conor.dooley@microchip.com>
> > Sent: Tuesday, June 18, 2024 4:50 PM
> > To: Pankaj Gupta <pankaj.gupta@nxp.com>
> > Cc: Conor Dooley <conor@kernel.org>; Jonathan Corbet <corbet@lwn.net>;
> > Rob Herring <robh@kernel.org>; Krzysztof Kozlowski <krzk+dt@kernel.org>;
> > Conor Dooley <conor+dt@kernel.org>; Shawn Guo <shawnguo@kernel.org>;
> > Sascha Hauer <s.hauer@pengutronix.de>; Pengutronix Kernel Team
> > <kernel@pengutronix.de>; Fabio Estevam <festevam@gmail.com>; Rob Herring
> > <robh+dt@kernel.org>; Krzysztof Kozlowski
> > <krzysztof.kozlowski+dt@linaro.org>; linux-doc@vger.kernel.org; linux-
> > kernel@vger.kernel.org; devicetree@vger.kernel.org; imx@lists.linux.dev; linux-
> > arm-kernel@lists.infradead.org
> > Subject: Re: [EXT] Re: [PATCH v3 2/5] dt-bindings: arm: fsl: add imx-se-fw
> > binding doc
> >
> > On Tue, Jun 18, 2024 at 10:58:47AM +0000, Pankaj Gupta wrote:
> > > > From: Conor Dooley <conor@kernel.org> 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@nxp.com>
> > > > > ---
> > > > > .../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@nxp.com>
> > > > > +
> > > > > +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]+$"
> > > + pattern: "^[0-9a-z]*-if@<hex>"
> >
> > Firstly, that's not even what I said verbatim, which I could understand. <hex>
> > isn't even a valid bit of regex for this.
> > What I want to see is something like: "^firmware@[0-9a-f]+$"
>
> These nodes define the interfaces(-if) to the "secure enclave" FW(-fw).
> Will replace "-if", with "-fw".
>
> There are multiple NXP IP(s) for secure enclave(s):
> - EdgeLock Enclave (ele)
> - Vehicular to anything (v2x)
> - SECO (seco)
>
> Having "ele-fw" helps identify the FW IP name.

If you need to indentify it, just use a label. "ele-if" or "ele-fw" is
not a generic node name.

>
> Will it be fine to use:
> - pattern: "^[0-9a-z]*-if@[0-9a-f]+$"
> + pattern: "^[0-9a-z]*-fw@[0-9a-f]+$"
>
> or
>
> - pattern: "^[0-9a-z]*-if@[0-9a-f]+$"
> + pattern: "^[0-9a-z]*-firmware@[0-9a-f]+$"

No, just use firmware please.

Thanks,
Conor.

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