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

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Date:   Thu, 21 Nov 2019 10:05:52 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Rob Herring <robh@...nel.org>
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 11/20/19 9:26 PM, Rob Herring wrote:
> 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'.
> 
it a privilege to help you to improve the scripts ;-)

Thanks for the reviews, based on it i will also update the following patch
dt-bindings: remoteproc: convert stm32-rproc to json-schema

Regards
Arnaud

>> 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;
>> +    };
>> +
>> +...