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

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Message-ID: <ea4ca423-c75d-468c-b5b2-673cd58e42c9@kernel.org>
Date: Wed, 22 Jan 2025 16:18:26 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: patrice.chotard@...s.st.com, 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 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.

> @@ -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.

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

Drop *cells.
> +
> +  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.

> +
> +  clocks:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 2

You need to list and describe the items.

> +
> +  dmas:
> +    items:
> +      - description: tx DMA channel
> +      - description: rx DMA channel

maxItems: 2 is enough, because names define what these are

> +
> +  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.

git grep -C 8 phandle-array
(e.g. some sram or syscon examples)



> +
> +  access-controllers:
> +    minItems: 1
> +    maxItems: 2

List the items.

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

Drop cells

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



Best regards,
Krzysztof