linux-kernel - RE: [RFC PATCH 3/6] dt-bindings: crypto: Add bindings for ZynqMP SHA3 driver

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Date:   Thu, 9 Dec 2021 07:20:54 +0000
From:   Harsha Harsha <harshah@...inx.com>
To:     Rob Herring <robh@...nel.org>
CC:     "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michal Simek <michals@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Sarat Chand Savitala <saratcha@...inx.com>,
        Harsh Jain <harshj@...inx.com>
Subject: RE: [RFC PATCH 3/6] dt-bindings: crypto: Add bindings for ZynqMP SHA3
 driver

Hi Rob,

Thanks for your review. Please find my reply inline.

> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Wednesday, December 8, 2021 10:42 PM
> To: Harsha Harsha <harshah@...inx.com>
> Cc: herbert@...dor.apana.org.au; davem@...emloft.net; linux-crypto@...r.kernel.org; linux-kernel@...r.kernel.org; Michal
> Simek <michals@...inx.com>; linux-arm-kernel@...ts.infradead.org; devicetree@...r.kernel.org; Sarat Chand Savitala
> <saratcha@...inx.com>; Harsh Jain <harshj@...inx.com>
> Subject: Re: [RFC PATCH 3/6] dt-bindings: crypto: Add bindings for ZynqMP SHA3 driver
> 
> On Tue, Dec 7, 2021 at 10:17 PM Harsha Harsha <harshah@...inx.com> wrote:
> >
> > Hi Rob,
> >
> > Thanks for your review.
> >
> >
> > > -----Original Message-----
> > > From: Rob Herring <robh@...nel.org>
> > > Sent: Wednesday, December 8, 2021 3:00 AM
> > > To: Harsha Harsha <harshah@...inx.com>
> > > Cc: herbert@...dor.apana.org.au; davem@...emloft.net; linux-crypto@...r.kernel.org; linux-kernel@...r.kernel.org; Michal
> > > Simek <michals@...inx.com>; linux-arm-kernel@...ts.infradead.org; devicetree@...r.kernel.org; Sarat Chand Savitala
> > > <saratcha@...inx.com>; Harsh Jain <harshj@...inx.com>
> > > Subject: Re: [RFC PATCH 3/6] dt-bindings: crypto: Add bindings for ZynqMP SHA3 driver
> > >
> > > On Tue, Nov 30, 2021 at 02:24:22PM +0530, Harsha wrote:
> > > > This patch adds documentation to describe Xilinx ZynqMP SHA3 driver
> > > > bindings.
> > > >
> > > > Signed-off-by: Harsha <harsha.harsha@...inx.com>
> > > > ---
> > > >  .../bindings/crypto/xlnx,zynqmp-sha3.yaml          | 30 ++++++++++++++++++++++
> > > >  1 file changed, 30 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/crypto/xlnx,zynqmp-sha3.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/crypto/xlnx,zynqmp-sha3.yaml
> > > b/Documentation/devicetree/bindings/crypto/xlnx,zynqmp-sha3.yaml
> > > > new file mode 100644
> > > > index 0000000..45a8022
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/crypto/xlnx,zynqmp-sha3.yaml
> > > > @@ -0,0 +1,30 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/crypto/xlnx,zynqmp-sha3.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Xilinx ZynqMP SHA3 Hardware Accelerator Device Tree Bindings
> > > > +
> > > > +maintainers:
> > > > +  - Harsha Harsha<harsha.harsha@...inx.com>
> > >
> > > space               ^
> >
> > Accepted. Will remove space in next version of patch series.
> >
> > >
> > > > +
> > > > +description: |
> > >
> > > Don't need '|' if no formatting to preserve.
> >
> > Accepted. Will remove | in next version of patch series.
> >
> > >
> > > > +  The ZynqMP SHA3 hardened cryptographic accelerator is used to
> > > > +  calculate the SHA3 hash for the given user data.
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    const: xlnx,zynqmp-sha3-384
> > > > +
> > > > +required:
> > > > +  - compatible
> > > > +
> > > > +additionalProperties: false
> > > > +
> > > > +examples:
> > > > +  - |
> > > > +    xlnx_sha3_384: sha3-384 {
> > >
> > > crypto {
> > >
> > > > +      compatible = "xlnx,zynqmp-sha3-384";
> > >
> > > You need some way to access this h/w.
> >
> > Accepted. Will add required details similar to https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-
> 2.6.git/tree/Documentation/devicetree/bindings/crypto/xlnx,zynqmp-aes.yaml
> 
> Why do you need a node for each crypto algorithm? Can't your firmware
> tell you what algorithms it supports? Worst case, try each possible
> one and see what fails or not. None of this needs to be in DT.
> 

Do you mean that the firmware should be self discovered and there is no
need to add any DT binding for this driver?

> Rob

Regards,
Harsha