linux-kernel - Re: [PATCH v5 5/9] dt-bindings: fsi: Document the FSI controller common properties

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Message-ID: <a219f01e-a856-46cb-83c4-4fde99b8addd@linux.ibm.com>
Date: Wed, 15 May 2024 09:28:32 -0500
From: Eddie James <eajames@...ux.ibm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, linux-fsi@...ts.ozlabs.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, robh@...nel.org,
        joel@....id.au, andrew@...econstruct.com.au
Subject: Re: [PATCH v5 5/9] dt-bindings: fsi: Document the FSI controller
 common properties


On 5/15/24 09:18, Krzysztof Kozlowski wrote:
> On 14/05/2024 21:54, Eddie James wrote:
>> Since there are multiple FSI controllers documented, the common
>> properties should be documented separately and then referenced
>> from the specific controller documentation.
>>
>> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
>> ---
>> Changes since v4:
>>   - Add interrupt controller properties
>>   - Add clock-frequency property to FSI controller and CFAM
>>   - Add detail to chip-id property description
>>
>>   .../bindings/fsi/fsi-controller.yaml          | 66 +++++++++++++++++++
>>   1 file changed, 66 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/fsi/fsi-controller.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/fsi/fsi-controller.yaml b/Documentation/devicetree/bindings/fsi/fsi-controller.yaml
>> new file mode 100644
>> index 0000000000000..8620e4da6de77
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/fsi/fsi-controller.yaml
>> @@ -0,0 +1,66 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/fsi/fsi-controller.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: FSI Controller Common Properties
>> +
>> +maintainers:
>> +  - Eddie James <eajames@...ux.ibm.com>
>> +
>> +description:
>> +  FSI (FRU (Field Replaceable Unit) Service Interface) is a two wire bus. The
>> +  FSI bus is connected to a CFAM (Common FRU Access Macro) which contains
>> +  various engines such as I2C controllers, SPI controllers, etc.
>> +
>> +properties:
>> +  "#address-cells":
>> +    const: 2
>> +
>> +  "#size-cells":
>> +    const: 0
>> +
>> +  '#interrupt-cells':
>> +    const: 1
>> +
>> +  clock-frequency:
>> +    minimum: 1
>> +    maximum: 200000000
> This is a deprecated property in general. Why did it appear? It does not
> exist in current bindings and nothing in commit msg suggests changes in
> the bindings themselves.


OK, is there some document that describes what properties are 
deprecated? Because it's used all over the place in the bindings. Anyway 
I need this property, I can rename it if you like. I can also update the 
commit message to indicate that I'm adding it.


Thanks,

Eddie



>
>> +
>> +  interrupt-controller: true
>> +
>> +  no-scan-on-init:
>> +    $ref: /schemas/types.yaml#/definitions/flag
>> +    description:
>> +      The FSI controller cannot scan the bus during initialization.
>> +
>> +patternProperties:
>> +  "cfam@[0-9a-f],[0-9a-f]":
>> +    type: object
>> +    properties:
>> +      chip-id:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description:
>> +          Processor index, a global unique chip ID which is used to identify
>> +          the physical location of the chip in a system specific way.
>> +
>> +      clock-frequency:
>> +        minimum: 1
>> +        maximum: 100000000
> Same question.
>
>
> Best regards,
> Krzysztof
>