linux-kernel - Re: [PATCH v3 1/2] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme

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Message-ID: <VI1P190MB03170C4FC92ED25F78EF57FC95319@VI1P190MB0317.EURP190.PROD.OUTLOOK.COM>
Date:   Tue, 25 Oct 2022 03:29:24 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Elad Nachman <enachman@...vell.com>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: Re: [PATCH v3 1/2] dt-bindings: mtd: marvell-nand: Convert to YAML DT
 scheme

Hi Krzysztof,

On Mon, 24 Oct 2022 17:31:48 -0400, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> On 24/10/2022 17:01, Vadym Kochan wrote:
> > Switch the DT binding to a YAML schema to enable the DT validation.
> > 
> > Dropped deprecated compatibles and properties described in txt file.
> > 
> > Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
> > ---
> > 
> > v3:
> >   1) Remove txt version from the MAINTAINERS list
> > 
> >   2) Use enum for some of compatible strings
> > 
> >   3) Drop:
> >         #address-cells
> >         #size-cells:
> > 
> >      as they are inherited from the nand-controller.yaml
> > 
> >   4) Add restriction to use 2 clocks for A8K SoC
> > 
> >   5) Dropped description for clock-names and extend it with 
> >      minItems: 1
> > 
> >   6) Drop description for "dmas"
> > 
> >   7) Use "unevalautedProperties: false"
> 
> Hmm... In one place it makes sense. In "nand@" not really.
> 
> > 
> >   8) Drop quites from yaml refs.
> > 
> >   9) Use 4-space indentation for the example section
> > 
> > v2:
> >   1) Fixed warning by yamllint with incorrect indentation for compatible list
> > 
> >  .../bindings/mtd/marvell,nand-controller.yaml | 189 ++++++++++++++++++
> >  .../devicetree/bindings/mtd/marvell-nand.txt  | 126 ------------
> >  MAINTAINERS                                   |   1 -
> >  3 files changed, 189 insertions(+), 127 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
> >  delete mode 100644 Documentation/devicetree/bindings/mtd/marvell-nand.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
> > new file mode 100644
> > index 000000000000..cb20f14d4aea
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
> > @@ -0,0 +1,189 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mtd/marvell,nand-controller.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Marvell NAND Flash Controller (NFC)
> > +
> > +maintainers:
> > +  - Miquel Raynal <miquel.raynal@...tlin.com>
> > +
> > +

[...]

> > +      nand-ecc-step-size:
> > +        description: |
> > +          Marvell's NAND flash controller does use fixed strength
> > +          (1-bit for Hamming, 16-bit for BCH), so the actual step size
> > +          will shrink or grow in order to fit the required strength.
> > +          Step sizes are not completely random for all and follow certain
> > +          patterns described in AN-379, "Marvell SoC NFC ECC".
> > +
> > +      label:
> > +        $ref: /schemas/types.yaml#/definitions/string
> > +
> > +      partitions:
> > +        type: object
> > +        $ref: /schemas/mtd/partitions/partition.yaml
> 
> This is a friendly reminder during the review process.
> 
> It seems my previous comments were not fully addressed. Maybe my
> feedback got lost between the quotes, maybe you just forgot to apply it.
> Please go back to the previous discussion and either implement all
> requested changes or keep discussing them.
> 
> Thank you.
> 

I see that I have to drop "label" and "partitions" properties.

> > +
> > +      marvell,nand-keep-config:
> > +        description: |
> > +          Orders the driver not to take the timings from the core and
> > +          leaving them completely untouched. Bootloader timings will then
> > +          be used.
> > +        $ref: /schemas/types.yaml#/definitions/flag
> > +
> > +      marvell,nand-enable-arbiter:
> > +        description: |
> > +          To enable the arbiter, all boards blindly used it,
> > +          this bit was set by the bootloader for many boards and even if
> > +          it is marked reserved in several datasheets, it might be needed to set
> > +          it (otherwise it is harmless) so whether or not this property is set,
> > +          the bit is selected by the driver.
> > +        $ref: /schemas/types.yaml#/definitions/flag
> > +        deprecated: true
> > +
> > +    unevaluatedProperties: false
> 
> This looks wrong. I do not see referencing schema here and I did not ask
> to change it.

Yes, I will drop it.

> 
> > +
> > +    required:
> > +      - reg
> > +      - nand-rb
> > +
> > +unevaluatedProperties: false
> 
> This one is ok.
> 
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +
> > +allOf:
> > +  - $ref: nand-controller.yaml#
> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: marvell,pxa3xx-nand-controller
> > +    then:
> > +      required:
> > +        - dmas
> > +        - dma-names
> > +    else:
> > +      properties:
> > +        dmas: false
> > +        dma-names: false
> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: marvell,armada-8k-nand-controller
> > +    then:
> > +      required:
> > +        - marvell,system-controller
> > +      properties:
> > +        clocks:
> > +          minItems: 2
> 
> Also for clock-names "minItems: 2"
> 
> > +    else:
> > +      properties:
> > +        marvell,system-controller: false
> 
>     clocks:
>       maxItems: 1
> 

OK, so it goes under the "else".

> and the same for clock-names... unless these variants also have two clocks?
> 
> 
> Best regards,
> Krzysztof
> 

Thank you,
Vadym