linux-kernel - Re: [PATCH 2/3] dt-bindings: mtd: add binding from BCM4908 partitions

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Date:   Mon, 25 Jan 2021 16:42:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH 2/3] dt-bindings: mtd: add binding from BCM4908 partitions

On Fri, Jan 15, 2021 at 04:39:00PM +0100, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> BCM4908 uses fixed partitions layout but function of some partitions may
> vary. Some devices use multiple firmware partitions and those should be
> marked to let system discover their purpose.
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
>  .../partitions/brcm,bcm4908-partitions.yaml   | 68 +++++++++++++++++++
>  1 file changed, 68 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
> new file mode 100644
> index 000000000000..4090b61a3da7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/brcm,bcm4908-partitions.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom BCM4908 partitioning
> +
> +description: |
> +  Broadcom BCM4908 CFE bootloader supports two firmware partitions. One is used
> +  for regular booting, the other is treated as fallback.
> +
> +  This binding allows defining all fixed partitions and marking those containing
> +  firmware. System can use that information e.g. for booting or flashing
> +  purposes.
> +
> +maintainers:
> +  - Rafał Miłecki <rafal@...ecki.pl>
> +
> +properties:
> +  compatible:
> +    const: brcm,bcm4908-partitions
> +
> +  "#address-cells": true
> +
> +  "#size-cells": true

limit these to 1 and 2? 

> +
> +patternProperties:
> +  "@[0-9a-f]+$":

^partition@...

> +    allOf:

You can drop 'allOf'.

> +      - $ref: "partition.yaml#"
> +      - properties:
> +          compatible:
> +            const: brcm,bcm4908-firmware

Also needs 'unevaluatedProperties: false'

> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    partitions {
> +        compatible = "brcm,bcm4908-partitions";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        partition@0 {
> +            label = "cferom";
> +            reg = <0x0 0x100000>;
> +        };
> +
> +        partition@...000 {
> +            compatible = "brcm,bcm4908-firmware";
> +            reg = <0x100000 0xf00000>;
> +        };
> +
> +        partition@...0000 {
> +            compatible = "brcm,bcm4908-firmware";
> +            reg = <0x1000000 0xf00000>;
> +        };
> +
> +        partition@...0000 {
> +            label = "calibration";
> +            reg = <0x1f00000 0x100000>;
> +        };
> +    };
> -- 
> 2.26.2
>