linux-kernel - Re: [PATCH 2/4] dt-bindings: reserved-memory: Add phram

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Date:   Thu, 10 Mar 2022 14:58:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     vigneshr@...com, richard@....at, miquel.raynal@...tlin.com,
        joern@...ybastard.org, kernel@...s.com,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, frowand.list@...il.com,
        krzysztof.kozlowski@...onical.com
Subject: Re: [PATCH 2/4] dt-bindings: reserved-memory: Add phram

On Mon, Mar 07, 2022 at 03:15:47PM +0100, Vincent Whitchurch wrote:
> Add bindings to allow MTD/block devices to be created in reserved-memory
> regions using the "phram" driver.

What does 'ph' mean? Please define somewhere for the binding.

> 
> This allows things like partitioning to be specified via the existing
> devicetree bindings.
> 
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---
>  .../bindings/reserved-memory/phram.yaml       | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reserved-memory/phram.yaml
> 
> diff --git a/Documentation/devicetree/bindings/reserved-memory/phram.yaml b/Documentation/devicetree/bindings/reserved-memory/phram.yaml
> new file mode 100644
> index 000000000000..92e7a80ee87a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/phram.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reserved-memory/phram.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MTD/block device in RAM
> +
> +description: |
> +  Use the reserved memory region as an MTD or block device.
> +
> +  If no-map is not set, cached mappings will be used for the memory region.
> +
> +maintainers:
> +  - Vincent Whitchurch <vincent.whitchurch@...s.com>
> +
> +allOf:
> +  - $ref: "reserved-memory.yaml"
> +  - $ref: "../mtd/mtd.yaml"

/schemas/mtd/mtd.yaml

> +
> +properties:
> +  compatible:
> +    const: phram
> +
> +  reg:
> +    description: region of memory that contains the MTD/block device
> +
> +required:
> +  - compatible
> +  - reg
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    reserved-memory {
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        phram: flash@...40000 {
> +            compatible = "phram";
> +            label = "rootfs";

That's an odd example...

> +            reg = <0x12340000 0x00800000>;
> +        };
> +    };
> -- 
> 2.34.1
> 
>