linux-kernel - Re: [PATCH v3 2/2] dt-bindings: mtd: Document use of nvmem-cells compatible

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Date:   Tue, 9 Mar 2021 19:58:33 -0700
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Vignesh Raghavendra <vigneshr@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] dt-bindings: mtd: Document use of nvmem-cells
 compatible

On Mon, Mar 08, 2021 at 02:18:45AM +0100, Ansuel Smith wrote:
> Document nvmem-cells compatible used to treat mtd partitions as a
> nvmem provider.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  .../bindings/mtd/partitions/nvmem-cells.yaml  | 105 ++++++++++++++++++
>  1 file changed, 105 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml b/Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
> new file mode 100644
> index 000000000000..4ed246b27985
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/nvmem-cells.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nvmem cells
> +
> +description: |
> +  This binding can be used to treat the specific partition as a nvmem provider.
> +  Each direct subnodes represents the nvmem cells and won't be parsed as fixed-partitions.
> +  Fixed-partitions bindings described in fixed-partitions.yaml apply to the nvmem provider node.
> +
> +maintainers:
> +  - Ansuel Smith <ansuelsmth@...il.com>
> +

I think this should reference nvmem.yaml. We can drop the $nodename 
restrictions in it.

> +properties:
> +  compatible:
> +    const: nvmem-cells
> +
> +  "#address-cells": true
> +
> +  "#size-cells": true
> +
> +  reg:
> +    description: partition offset and size within the flash
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +  - reg
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +    partitions {
> +      compatible = "fixed-partitions";
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +
> +      /* ... */
> +
> +      };
> +      art: art@...0000 {
> +        compatible = "nvmem-cells";
> +        reg = <0x1200000 0x0140000>;
> +        label = "art";
> +        read-only;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        macaddr_gmac1: macaddr_gmac1@0 {
> +          reg = <0x0 0x6>;
> +        };
> +
> +        macaddr_gmac2: macaddr_gmac2@6 {
> +          reg = <0x6 0x6>;
> +        };
> +
> +        pre_cal_24g: pre_cal_24g@...0 {
> +          reg = <0x1000 0x2f20>;
> +        };
> +
> +        pre_cal_5g: pre_cal_5g@...0{
> +          reg = <0x5000 0x2f20>;
> +        };
> +      };
> +  - |
> +    partitions {
> +        compatible = "fixed-partitions";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        partition@0 {
> +            label = "bootloader";
> +            reg = <0x000000 0x100000>;
> +            read-only;
> +        };
> +
> +        firmware@...000 {
> +            compatible = "brcm,trx";
> +            label = "firmware";
> +            reg = <0x100000 0xe00000>;
> +        };
> +
> +        calibration@...000 {
> +            compatible = "nvmem-cells";
> +            label = "calibration";
> +            reg = <0xf00000 0x100000>;
> +            ranges = <0 0xf00000 0x100000>;
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +
> +            wifi0@0 {
> +                reg = <0x000000 0x080000>;
> +            };
> +
> +            wifi1@...00 {
> +                reg = <0x080000 0x080000>;
> +            };
> +        };
> +    };
> -- 
> 2.30.0
>