linux-kernel - Re: [PATCH v3 7/9] dt-bindings: mtd: Split ECC engine with rawnand controller

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Date:   Thu, 8 Dec 2022 10:44:17 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Xiangsheng Hou <xiangsheng.hou@...iatek.com>,
        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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Chuanhong Guo <gch981213@...il.com>
Cc:     linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, benliang.zhao@...iatek.com,
        bin.zhang@...iatek.com
Subject: Re: [PATCH v3 7/9] dt-bindings: mtd: Split ECC engine with rawnand
 controller

On 08/12/2022 07:29, Xiangsheng Hou wrote:
> Split MediaTek ECC engine with rawnand controller and convert to
> YAML schema.
> 
> Signed-off-by: Xiangsheng Hou <xiangsheng.hou@...iatek.com>
> ---
>  .../bindings/mtd/mediatek,mtk-nfc.yaml        | 154 +++++++++++++++
>  .../mtd/mediatek,nand-ecc-engine.yaml         |  62 ++++++
>  .../devicetree/bindings/mtd/mtk-nand.txt      | 176 ------------------
>  3 files changed, 216 insertions(+), 176 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mtd/mediatek,mtk-nfc.yaml
>  create mode 100644 Documentation/devicetree/bindings/mtd/mediatek,nand-ecc-engine.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mtd/mtk-nand.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/mediatek,mtk-nfc.yaml b/Documentation/devicetree/bindings/mtd/mediatek,mtk-nfc.yaml
> new file mode 100644
> index 000000000000..eb1a44c7ae4e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/mediatek,mtk-nfc.yaml
> @@ -0,0 +1,154 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/mediatek,mtk-nfc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek(MTK) SoCs raw NAND FLASH controller (NFC)
> +
> +maintainers:
> +  - Xiangsheng Hou <xiangsheng.hou@...iatek.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt2701-nfc
> +      - mediatek,mt2712-nfc
> +      - mediatek,mt7622-nfc
> +
> +  reg:
> +    items:
> +      - description: Base physical address and size of NFI.
> +
> +  interrupts:
> +    items:
> +      - description: NFI interrupt
> +
> +  clocks:
> +    items:
> +      - description: clock used for the controller
> +      - description: clock used for the pad
> +
> +  clock-names:
> +    items:
> +      - const: nfi_clk
> +      - const: pad_clk
> +
> +  ecc-engine:
> +    description: device-tree node of the required ECC engine.
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +patternProperties:
> +  "^nand@[a-f0-9]$":
> +    type: object

This should be instead:
    $ref: nand-chip.yaml#
    unevaluatedProperties: false

and then properties below (due to current dtschema limitations) should
list properties from nand-controller.yaml:

      nand-on-flash-bbt: true

Optionally, we could create additional schema - nand-controller-chip,
which would be referenced directly by nand-controller and itself would
ref nand-chip.

> +    properties:
> +      reg:
> +        minimum: 0

no need, 0 is the minimum.

> +        maximum: 1
> +      nand-ecc-mode:
> +        const: hw
> +
> +allOf:
> +  - $ref: nand-controller.yaml#
> +
> +  - if:

Best regards,
Krzysztof