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SubjectRe: [PATCH v2 1/6] dt-bindings: reserved-memory: Add Owl SoC serial number binding
On Tue, Mar 30, 2021 at 04:48:16PM +0300, Cristian Ciocaltea wrote:
> Add devicetree binding for the Actions Semi Owl SoC serial number
> reserved-memory range.
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> ---
> .../actions,owl-soc-serial.yaml | 53 +++++++++++++++++++
> 1 file changed, 53 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
>
> diff --git a/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> new file mode 100644
> index 000000000000..41b71f47ee6c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/actions,owl-soc-serial.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reserved-memory/actions,owl-soc-serial.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Actions Semi Owl reserved-memory for SoC serial number
> +
> +maintainers:
> + - Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> +
> +description: |
> + Provide access to the memory region where the two parts of the Actions
> + Semi Owl SoC serial number (low & high) can be read from. This information
> + is provided by the bootloader, hence expose it under /reserved-memory node.
> +
> + Please refer to reserved-memory.txt in this directory for common binding
> + part and usage.
> +
> + This is currently supported only on the S500 SoC variant.
> +
> +properties:
> + compatible:
> + oneOf:
> + - const: actions,owl-soc-serial
> + - items:
> + - enum:
> + - actions,s500-soc-serial
> + - const: actions,owl-soc-serial
> +
> + reg:
> + maxItems: 1
> +
> +required:
> + - compatible
> + - reg
> +
> +additionalProperties: true
> +
> +examples:
> + - |
> + reserved-memory {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + soc_serial: soc-serial@800 {
> + compatible = "actions,s500-soc-serial", "actions,owl-soc-serial";
> + reg = <0x800 0x8>;

You end up wasting a whole page of memory for 8 bytes. It may be better
to copy this to a DT property ('serial-number' is already a defined root
property).

Rob

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