linux-kernel - Re: [PATCH 1/9] dt-bindings: spi: Add STM32 OSPI controller

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Message-ID: <2d712420-c8ed-4bf9-83ec-348f71aa1ce9@foss.st.com>
Date: Fri, 24 Jan 2025 16:53:04 +0100
From: Patrice CHOTARD <patrice.chotard@...s.st.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas
	<catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
CC: <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <christophe.kerello@...s.st.com>
Subject: Re: [PATCH 1/9] dt-bindings: spi: Add STM32 OSPI controller



On 1/22/25 16:18, Krzysztof Kozlowski wrote:
> On 22/01/2025 15:10, patrice.chotard@...s.st.com wrote:
>> ---
>>  .../bindings/spi/st,stm32-ospi.yaml           | 109 ++++++++++++++++++
>>  1 file changed, 109 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/spi/st,stm32-ospi.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-ospi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-ospi.yaml
>> new file mode 100644
>> index 000000000000..bf16252f85fa
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/spi/st,stm32-ospi.yaml
> 
> 
> Use compatible as filename.

Ok

> 
>> @@ -0,0 +1,109 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/spi/st,stm32-ospi.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: STMicroelectronics STM32 Octal Serial Peripheral Interface (OSPI)
>> +
>> +maintainers:
>> +  - Patrice Chotard <patrice.chotard@...s.st.com>
>> +
>> +allOf:
>> +  - $ref: spi-controller.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: st,stm32mp25-ospi
>> +
>> +  reg:
>> +    description: registers
> 
> That's not helping. Please take a look how other bindings do it.
> maxItems instead or you need to list the items with meaningful description.

ok, will use maxItems

> 
>> +
>> +  "#address-cells":
>> +    const: 1
>> +
>> +  "#size-cells":
>> +    const: 0
> 
> Drop *cells.

ok

>> +
>> +  memory-region:
>> +    maxItems: 1
>> +    description: Phandle to a node describing memory-map region to be used
> 
> Drop description, redundant. Say something useful - the purpose - or
> just maxItems if purpose is obvious.

ok, i will add 
      - description: phandle to OSPI block reset
      - description: phandle to delay block reset

> 
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  resets:
>> +    maxItems: 2
> 
> You need to list and describe the items.

ok

> 
>> +
>> +  dmas:
>> +    items:
>> +      - description: tx DMA channel
>> +      - description: rx DMA channel
> 
> maxItems: 2 is enough, because names define what these are

ok

> 
>> +
>> +  dma-names:
>> +    items:
>> +      - const: tx
>> +      - const: rx
>> +
>> +  st,syscfg-dlyb:
>> +    description: |
>> +      Use to set the OSPI delay block within SYSCFG to:
> 
> Phandles to what? Describe also the destination device.
> 
>> +        Tune the phase of the RX sampling clock (or DQS) in order
> 
> Unneeded indentation.
> 
>> +        to sample the data in their valid window.
>> +        Tune the phase of the TX launch clock in order to meet setup
>> +        and hold constraints of TX signals versus the memory clock.
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    items:
>> +      minItems: 2
>> +      maxItems: 2
> 
> Your example has only one item, so probably you wanted one more items
> with description. Now you miss one of matrix constraints.

My fault, only one item is required.

> 
> git grep -C 8 phandle-array
> (e.g. some sram or syscon examples)
> 
> 
> 
>> +
>> +  access-controllers:
>> +    minItems: 1
>> +    maxItems: 2
> 
> List the items.

i will update as following:
  access-controllers:
    - description: phandle to the rifsc device to check access right.
    - description: phandle to the rcc device for secure clock control
    minItems: 1
    maxItems: 2

> 
>> +
>> +  power-domains:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - "#address-cells"
>> +  - "#size-cells"
> 
> Drop cells

ok

> 
>> +  - clocks
>> +  - interrupts
>> +  - st,syscfg-dlyb
>> +
>> +unevaluatedProperties: false
>> +
> 
> 
> 
> Best regards,
> Krzysztof