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

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Message-ID: <eb6e2b5b-f341-404b-9215-6e80f21a6842@kernel.org>
Date: Wed, 15 May 2024 16:35:37 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Eddie James <eajames@...ux.ibm.com>, 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 15/05/2024 16:28, Eddie James wrote:
> 
> 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 

dtschema: dtschema/schemas/clock/clock.yaml

buses anyway should use bus-frequency but it is also legacy one.

> I need this property, I can rename it if you like. I can also update the 

Why do you need it? Why clocks cannot be chosen by drivers and initial
state selected by assigned-clock-rates?


> commit message to indicate that I'm adding it.



Best regards,
Krzysztof