[PATCH v8 1/2] dt-bindings: mtd: Add Loongson-1 NAND Controller

[Keguang Zhang]

On Thu, Aug 8, 2024 at 11:37 PM Conor Dooley <conor at kernel.org> wrote:
>
> On Thu, Aug 08, 2024 at 07:22:19PM +0800, Keguang Zhang via B4 Relay wrote:
> > From: Keguang Zhang <keguang.zhang at gmail.com>
> >
> > Add devicetree binding document for Loongson-1 NAND Controller.
> >
> > Signed-off-by: Keguang Zhang <keguang.zhang at gmail.com>
> > ---
> > Changes in v8:
> > - Add a description part.
> > - Adjust the compatible because the match data for ls1c-nfc differs from ls1b-nfc.
> > - Mark 'nand-use-soft-ecc-engine' and 'nand-ecc-algo' as mandatory.
> > - Delete the superfluous blank lines.
> >
> > Changes in v7:
> > - rename the file to loongson,ls1b-nfc.yaml
> >
> > Changes in v6:
> > - A newly added patch
> > ---
> >  .../devicetree/bindings/mtd/loongson,ls1b-nfc.yaml | 75 ++++++++++++++++++++++
> >  1 file changed, 75 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mtd/loongson,ls1b-nfc.yaml b/Documentation/devicetree/bindings/mtd/loongson,ls1b-nfc.yaml
> > new file mode 100644
> > index 000000000000..7ce335324a29
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mtd/loongson,ls1b-nfc.yaml
>
> When I first read "nfc" here I thought it was a copy-paste mistake, as
> "nfc" is a technology of it's own. I think it would make sense to rename
> to "loongson,ls1b-nand-controller" etc to remove that sort of confusion.
> These devices might not implement NFC, but what's to say that a future
> device will not?
>
Sorry for the confusion.
The string "loongson,ls1b-nand-controller" might be too long.
May I rename it to "loongson,ls1b-nand"?

> Cheers,
> Conor.
>
> > @@ -0,0 +1,75 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mtd/loongson,ls1b-nfc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Loongson-1 NAND Controller
> > +
> > +maintainers:
> > +  - Keguang Zhang <keguang.zhang at gmail.com>
> > +
> > +description: |
>
> This | is not needed.
>
Will remove |.
Thanks!

> > +  The Loongson-1 NAND controller abstracts all supported operations,
> > +  meaning it does not support low-level access to raw NAND flash chips.
> > +  Moreover, the controller is paired with the DMA engine to perform
> > +  READ and PROGRAM functions.
> > +
> > +allOf:
> > +  - $ref: nand-controller.yaml
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - enum:
> > +          - loongson,ls1b-nfc
> > +          - loongson,ls1c-nfc
> > +      - items:
> > +          - enum:
> > +              - loongson,ls1a-nfc
> > +          - const: loongson,ls1b-nfc
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  dmas:
> > +    maxItems: 1
> > +
> > +  dma-names:
> > +    const: rxtx
> > +
> > +patternProperties:
> > +  "^nand@[0-3]$":
> > +    type: object
> > +    $ref: raw-nand-chip.yaml
> > +
> > +    required:
> > +      - nand-use-soft-ecc-engine
> > +      - nand-ecc-algo
> > +
> > +    unevaluatedProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - dmas
> > +  - dma-names
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    nand-controller at 1fe78000 {
> > +        compatible = "loongson,ls1b-nfc";
> > +        reg = <0x1fe78000 0x40>;
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +        dmas = <&dma 0>;
> > +        dma-names = "rxtx";
> > +
> > +        nand at 0 {
> > +            reg = <0>;
> > +            nand-use-soft-ecc-engine;
> > +            nand-ecc-algo = "hamming";
> > +        };
> > +    };
> >
> > --
> > 2.43.0
> >
> >



--
Best regards,

Keguang Zhang