linux-kernel - Re: [PATCH v3 03/14] dt-bindings: fsi: Document the FSI2PIB engine

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Message-ID: <5ef318a3-7fc9-47e8-9944-07365c9e377f@kernel.org>
Date: Sun, 28 Apr 2024 18:41:23 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Eddie James <eajames@...ux.ibm.com>, linux-aspeed@...ts.ozlabs.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-fsi@...ts.ozlabs.org, linux-spi@...r.kernel.org,
 linux-i2c@...r.kernel.org, lakshmiy@...ibm.com, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, joel@....id.au,
 andrew@...econstruct.com.au
Subject: Re: [PATCH v3 03/14] dt-bindings: fsi: Document the FSI2PIB engine

On 26/04/2024 17:00, Eddie James wrote:
> 
> On 4/26/24 01:18, Krzysztof Kozlowski wrote:
>> On 25/04/2024 23:36, Eddie James wrote:
>>> The FSI2PIB or SCOM engine provides an interface to the POWER processor
>>> PIB (Pervasive Interconnect Bus).
>>>
>>> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
>>> ---
>>>   .../devicetree/bindings/fsi/ibm,fsi2pib.yaml  | 38 +++++++++++++++++++
>>>   1 file changed, 38 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml b/Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml
>>> new file mode 100644
>>> index 000000000000..4d557150c2e3
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/fsi/ibm,fsi2pib.yaml
>>> @@ -0,0 +1,38 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/fsi/ibm,fsi2pib.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: IBM FSI-attached SCOM engine
>>> +
>>> +maintainers:
>>> +  - Eddie James <eajames@...ux.ibm.com>
>>> +
>>> +description:
>>> +  The SCOM engine is an interface to the POWER processor PIB (Pervasive
>>> +  Interconnect Bus). This node will always be a child of an FSI CFAM node;
>>> +  see fsi.txt for details on FSI slave and CFAM nodes.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - ibm,fsi2pib
>>> +      - ibm,i2cr-scom
>> Sometimes you call these p9, sometimes p10... what is the system or SoC
>> here? Aren't you adding some generic compatibles? writing-bindings and
>> numerous guides are clear on that.
> 
> 
> Open source FSI support started with P9 chips so we initially added 
> p9-sbefifo, p9-occ, etc. P10 has all of the same engines as P9 plus the 
> SPI controller, so that's why SPI is p10-spi. P11 has the same engines 
> as P10. For scom/fsi2pib we could call it p9-scom I suppose... This 
> series isn't just documentation for a new system, I'm adding 
> documentation that should have been added for P9. Anyway I'm not sure 
> what you mean about generic compatibles? You mean just add a "scom" or 
> "fsi2pib" compatible? writing-bindings says "DO make 'compatible' 
> properties specific"

Usually it means that parts of SoC must have the name of the SoC, as
first component of the name. Your boards are a bit different here,
because I suppose no one will ever make a product except you, but still
code could follow same set of rules.

Best regards,
Krzysztof