linux-kernel - Re: [PATCH v5 2/2] dt-bindings: mtd: davinci: convert to yaml

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Message-ID: <4u5iv24enpz46funfvbo2aggx6yiqxy7beaa3ldt5ai5wf65kl@bnlm4eyuwkui>
Date: Tue, 8 Oct 2024 15:28:33 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Marcus Folkesson <marcus.folkesson@...il.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>, 
	Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v5 2/2] dt-bindings: mtd: davinci: convert to yaml

On Tue, Oct 08, 2024 at 09:02:45AM +0200, Marcus Folkesson wrote:
> Convert the bindings to yaml format.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> ---
>  .../devicetree/bindings/mtd/davinci-nand.txt       |  94 -----------------
>  .../devicetree/bindings/mtd/ti,davinci-nand.yaml   | 115 +++++++++++++++++++++
>  2 files changed, 115 insertions(+), 94 deletions(-)
> 


> diff --git a/Documentation/devicetree/bindings/mtd/ti,davinci-nand.yaml b/Documentation/devicetree/bindings/mtd/ti,davinci-nand.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..1263616593532e8483d556b4242b004a16620ddf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/ti,davinci-nand.yaml
> @@ -0,0 +1,115 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/ti,davinci-nand.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI DaVinci NAND controller
> +
> +maintainers:
> +  - Marcus Folkesson <marcus.folkesson@...il.com>
> +
> +allOf:
> +  - $ref: nand-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,davinci-nand
> +      - ti,keystone-nand
> +
> +  reg:
> +    maxItems: 1

This was different in original binding and commit msg does not explain
changes.  Be sure any change from pure conversion is explained in the
commit msg.

> +
> +  partitions:
> +    $ref: /schemas/mtd/partitions/partitions.yaml
> +
> +  ti,davinci-chipselect:
> +    description:
> +      Number of chipselect. Indicate on the davinci_nand driver which
> +      chipselect is used for accessing the nand.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3]
> +
> +  ti,davinci-mask-ale:
> +    description:
> +      Mask for ALE. Needed for executing address phase. These offset will be
> +      added to the base address for the chip select space the NAND Flash
> +      device is connected to.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0x08
> +
> +  ti,davinci-mask-cle:
> +    description:
> +      Mask for CLE. Needed for executing command phase. These offset will be
> +      added to the base address for the chip select space the NAND Flash device
> +      is connected to.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0x10
> +
> +  ti,davinci-mask-chipsel:
> +    description:
> +      Mask for chipselect address. Needed to mask addresses for given
> +      chipselect.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0
> +
> +  ti,davinci-ecc-bits:
> +    description: Used ECC bits.
> +    enum: [1, 4]
> +
> +  ti,davinci-ecc-mode:
> +    description: Operation mode of the NAND ECC mode.
> +    $ref: /schemas/types.yaml#/definitions/string
> +    enum: [none, soft, hw, on-die]
> +    deprecated: true
> +
> +  ti,davinci-nand-buswidth:
> +    description: Bus width to the NAND chip
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [8, 16]
> +    default: 8
> +    deprecated: true
> +
> +  ti,davinci-nand-use-bbt:
> +    type: boolean
> +    description:
> +      Use flash based bad block table support. OOB identifier is saved in OOB
> +      area.
> +    deprecated: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - ti,davinci-chipselect
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    nand-controller@...0000 {
> +      compatible = "ti,davinci-nand";
> +      #address-cells = <1>;
> +      #size-cells = <0>;

I did not notice it last time.... but what is this? How could you have
no sizes?

> +
> +      reg = <0 0x02000000>;

This is odd. Address is not 0... and size should be 0.

I don't get how it even works. For sure it is not correct.

Best regards,
Krzysztof