linux-kernel - Re: [PATCH v3 2/4] spi: dt-bindings: samsung: convert to dtschema

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Message-ID: <5f912896-0635-fbe7-4fda-f4cb569190d9@canonical.com>
Date:   Wed, 19 Jan 2022 20:49:44 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Andi Shyti <andi@...zian.org>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-spi@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sam Protsenko <semen.protsenko@...aro.org>
Subject: Re: [PATCH v3 2/4] spi: dt-bindings: samsung: convert to dtschema

On 19/01/2022 20:31, Pratyush Yadav wrote:
> On 12/01/22 11:00AM, Krzysztof Kozlowski wrote:
>> Convert the Samsung SoC (S3C24xx, S3C64xx, S5Pv210, Exynos) SPI
>> controller bindings to DT schema format
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
>> ---
>>  .../spi/samsung,spi-peripheral-props.yaml     |  35 ++++
>>  .../devicetree/bindings/spi/samsung,spi.yaml  | 187 ++++++++++++++++++
>>  .../bindings/spi/spi-peripheral-props.yaml    |   1 +
>>  .../devicetree/bindings/spi/spi-samsung.txt   | 122 ------------
>>  MAINTAINERS                                   |   2 +-
>>  5 files changed, 224 insertions(+), 123 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/spi/samsung,spi-peripheral-props.yaml
>>  create mode 100644 Documentation/devicetree/bindings/spi/samsung,spi.yaml
>>  delete mode 100644 Documentation/devicetree/bindings/spi/spi-samsung.txt
>>
>> diff --git a/Documentation/devicetree/bindings/spi/samsung,spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/samsung,spi-peripheral-props.yaml
>> new file mode 100644
>> index 000000000000..aa5a1f48494b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/spi/samsung,spi-peripheral-props.yaml
>> @@ -0,0 +1,35 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/spi/samsung,spi-peripheral-props.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Peripheral-specific properties for Samsung S3C/S5P/Exynos SoC SPI controller
>> +
>> +maintainers:
>> +  - Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> +
>> +description:
>> +  See spi-peripheral-props.yaml for more info.
>> +
>> +properties:
>> +  controller-data:
>> +    type: object
>> +    additionalProperties: false
>> +
>> +    properties:
>> +      samsung,spi-feedback-delay:
>> +        description: |
>> +          The sampling phase shift to be applied on the miso line (to account
>> +          for any lag in the miso line). Valid values:
>> +           - 0: No phase shift.
>> +           - 1: 90 degree phase shift sampling.
>> +           - 2: 180 degree phase shift sampling.
>> +           - 3: 270 degree phase shift sampling.
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        enum: [0, 1, 2, 3]
>> +
>> +    required:
>> +      - samsung,spi-feedback-delay
> 
> I am not quite sure if this required would work here. Let's say another 
> controller also uses a controller-data node, but it contains a different 
> set of properties. Won't this cause an error to be raised for that 
> controller since this property is not there?

The controller-data is Samsung SPI specific (does not exist in any other
binding), so why would controller-data get added to a different controller?

Best regards,
Krzysztof