linux-kernel - Re: [PATCH v2] dt-bindings: mailbox: convert stm32-ipcc to json-schema

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Date:   Wed, 20 Nov 2019 14:26:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fabien Dessenne <fabien.dessenne@...com>
Subject: Re: [PATCH v2] dt-bindings: mailbox: convert stm32-ipcc to json-schema

On Mon, Nov 18, 2019 at 4:15 AM Arnaud Pouliquen
<arnaud.pouliquen@...com> wrote:
>
> Convert the STM32 IPCC bindings to DT schema format using
> json-schema
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
> ---
>  .../bindings/mailbox/st,stm32-ipcc.yaml       | 91 +++++++++++++++++++
>  .../bindings/mailbox/stm32-ipcc.txt           | 47 ----------
>  2 files changed, 91 insertions(+), 47 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/st,stm32-ipcc.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt

Thanks for helping me find 2 meta-schema errors. :) Please update
dt-schema and re-run 'make dt_binding_check'.

> diff --git a/Documentation/devicetree/bindings/mailbox/st,stm32-ipcc.yaml b/Documentation/devicetree/bindings/mailbox/st,stm32-ipcc.yaml
> new file mode 100644
> index 000000000000..90157d4deac1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/st,stm32-ipcc.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/mailbox/st,stm32-ipcc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: STMicroelectronics STM32 IPC controller bindings
> +
> +description:
> +  The IPCC block provides a non blocking signaling mechanism to post and
> +  retrieve messages in an atomic way between two processors.
> +  It provides the signaling for N bidirectionnal channels. The number of
> +  channels (N) can be read from a dedicated register.
> +
> +maintainers:
> +  - Fabien Dessenne <fabien.dessenne@...com>
> +  - Arnaud Pouliquen <arnaud.pouliquen@...com>
> +
> +properties:
> +  compatible:
> +    const: st,stm32mp1-ipcc
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +     maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: rx channel occupied
> +      - description: tx channel free
> +      - description: wakeup source
> +    minItems: 2
> +    maxItems: 3
> +
> +  interrupt-names:
> +    items:
> +      enums: [ rx, tx, wakeup ]

'enums' is not a valid keyword. 'enum' is valid, but his should be in
a defined order (so a list of items).

> +    minItems: 2
> +    maxItems: 3
> +
> +  wakeup-source:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      Enables wake up of host system on wakeup IRQ assertion.

Just 'true' is enough here. Assume we have a common definition.

> +
> +  "#mbox-cells":
> +    const: 1
> +
> +  st,proc-id:
> +    description: Processor id using the mailbox (0 or 1)
> +    allOf:
> +      - minimum: 0
> +      - maximum: 1

'enum: [ 0, 1 ]' is more concise.

Also, needs a $ref to the type.

> +      - default: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - st,proc-id
> +  - clocks
> +  - interrupt-names
> +  - "#mbox-cells"
> +
> +oneOf:
> +  - required:
> +      - interrupts
> +  - required:
> +      - interrupts-extended

The tooling takes care of this for you. Just list 'interrupts' as required.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/stm32mp1-clks.h>
> +    ipcc: mailbox@...01000 {
> +      compatible = "st,stm32mp1-ipcc";
> +      #mbox-cells = <1>;
> +      reg = <0x4c001000 0x400>;
> +      st,proc-id = <0>;
> +      interrupts-extended = <&intc GIC_SPI 100 IRQ_TYPE_NONE>,
> +                     <&intc GIC_SPI 101 IRQ_TYPE_NONE>,
> +                     <&aiec 62 1>;
> +      interrupt-names = "rx", "tx", "wakeup";
> +      clocks = <&rcc_clk IPCC>;
> +      wakeup-source;
> +    };
> +
> +...