linux-kernel - Re: [PATCH 10/13] dt-bindings: memory-controllers: convert Calxeda DDR to json-schema

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Date:   Wed, 26 Feb 2020 19:27:45 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Rob Herring <robh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Robert Richter <rric@...nel.org>,
        soc@...nel.org, Jon Loeliger <jdl@....com>,
        Mark Langsdorf <mlangsdo@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 10/13] dt-bindings: memory-controllers: convert Calxeda
 DDR to json-schema

On Wed, Feb 26, 2020 at 06:08:58PM +0000, Andre Przywara wrote:
> Convert the Calxeda DDR memory controller binding to DT schema format
> using json-schema.
> Although this technically covers the whole DRAM controller, the
> intention to use it only for error reporting and mapping fault addresses
> to DRAM chips.
>
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
>  .../memory-controllers/calxeda-ddr-ctrlr.txt  | 16 --------
>  .../memory-controllers/calxeda-ddr-ctrlr.yaml | 41 +++++++++++++++++++
>  2 files changed, 41 insertions(+), 16 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.txt
>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.yaml
>
> diff --git a/Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.txt b/Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.txt
> deleted file mode 100644
> index 049675944b78..000000000000
> --- a/Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.txt
> +++ /dev/null
> @@ -1,16 +0,0 @@
> -Calxeda DDR memory controller
> -
> -Properties:
> -- compatible : Should be:
> -  - "calxeda,hb-ddr-ctrl" for ECX-1000
> -  - "calxeda,ecx-2000-ddr-ctrl" for ECX-2000
> -- reg : Address and size for DDR controller registers.
> -- interrupts : Interrupt for DDR controller.
> -
> -Example:
> -
> -	memory-controller@...00000 {
> -		compatible = "calxeda,hb-ddr-ctrl";
> -		reg = <0xfff00000 0x1000>;
> -		interrupts = <0 91 4>;
> -	};
> diff --git a/Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.yaml b/Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.yaml
> new file mode 100644
> index 000000000000..c5153127e722
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/calxeda-ddr-ctrlr.yaml
> @@ -0,0 +1,41 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/memory-controllers/calxeda-ddr-ctrlr.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Calxeda DDR memory controller binding
> +
> +description: |
> +  The Calxeda DDR memory controller is initialised and programmed by the
> +  firmware, but an OS might want to read its registers for error reporting
> +  purposes and to learn about the DRAM topology.
> +
> +maintainers:
> +  - Andre Przywara <andre.przywara@....com>
> +
> +properties:
> +  compatible:
> +    items:
> +    - enum:
> +        - calxeda,hb-ddr-ctrl
> +        - calxeda,ecx-2000-ddr-ctrl

You don't need the items here, you can just have the enum directly
(like you did in your other schemas).

> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts

And you're probably missing additionalProperties too (and in other
schemas).

Maxime

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