linux-kernel - Re: [PATCH 1/2] dt-bindings: mtd: nuvoton,ma35d1-nand: add new bindings

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Message-ID: <7a8b9bdf-f4df-4da0-83ca-157175817e99@kernel.org>
Date: Mon, 12 Aug 2024 08:25:28 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Hui-Ping Chen <hpchen0nvt@...il.com>, miquel.raynal@...tlin.com,
 richard@....at, vigneshr@...com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, sumit.semwal@...aro.org, christian.koenig@....com,
 esben@...nix.com
Cc: linux-arm-kernel@...ts.infradead.org, linux-mtd@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH 1/2] dt-bindings: mtd: nuvoton,ma35d1-nand: add new
 bindings

On 12/08/2024 05:00, Hui-Ping Chen wrote:
> Add dt-bindings for the Nuvoton MA35 SoC NAND Controller.
> 
> Signed-off-by: Hui-Ping Chen <hpchen0nvt@...il.com>
> ---
>  .../bindings/mtd/nuvoton,ma35d1-nand.yaml     | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/nuvoton,ma35d1-nand.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/nuvoton,ma35d1-nand.yaml b/Documentation/devicetree/bindings/mtd/nuvoton,ma35d1-nand.yaml
> new file mode 100644
> index 000000000000..988c43bc6e99
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/nuvoton,ma35d1-nand.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/nuvoton,ma35d1-nand.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nuvoton MA35D1 NAND Flash Interface (NFI) Controller
> +
> +allOf:
> +  - $ref: nand-controller.yaml#

allOf goes usually just before properties.

> +
> +maintainers:
> +  - Hui-Ping Chen <hpchen0nvt@...il.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nuvoton,ma35d1-nand
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1

This cannot be min only. It's unconstrained. maxItems instead. There is
no existing code like this so this should make you wonder...

> +
> +patternProperties:
> +  "^nand@[a-f0-9]$":
> +    type: object
> +    $ref: raw-nand-chip.yaml
> +    properties:
> +      nand-ecc-mode:
> +        const: hw

No, drop the property. It does not make sense to have it const.
Compatible defines it.

> +
> +      nand-ecc-step-size:
> +        enum: [512, 1024]

No defaults? So is this required?

> +
> +      nand-ecc-strength:
> +        enum: [8, 12, 24]

No defaults? So is this required?

> +
> +      nand-bus-width:
> +        const: 8

Drop property.

> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/nuvoton,ma35d1-clk.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        nand-controller@...A0000 {
> +            compatible = "nuvoton,ma35d1-nand";
> +            reg = <0x0 0x401A0000 0x0 0x1000>;
> +            interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
> +            clocks = <&clk NAND_GATE>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            nand@0 {
> +                reg = <0>;
> +
> +                nand-on-flash-bbt;
> +                nand-ecc-mode = "hw";

Drop

> +                nand-ecc-step-size = <512>;
> +                nand-ecc-strength = <8>;
> +                nand-bus-width = <8>;

Drop

> +
> +                partitions {
> +                    compatible = "fixed-partitions";
> +                    #address-cells = <1>;
> +                    #size-cells = <1>;
> +
> +                    uboot@0 {
> +                        label = "nand-uboot";
> +                        read-only;
> +                        reg = <0x0 0x300000>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> +
> +...

Best regards,
Krzysztof