linux-kernel - Re: [PATCH 1/2] dt-bindings: arm: fsl: Update i.MX95 compatible

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Message-ID: <8d2746ba-47d2-429b-9df0-9448a4516ef1@kernel.org>
Date: Mon, 6 Jan 2025 07:12:29 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Peng Fan <peng.fan@....com>, "Peng Fan (OSS)" <peng.fan@....nxp.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>
Cc: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
 "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] dt-bindings: arm: fsl: Update i.MX95 compatible

On 06/01/2025 03:51, Peng Fan wrote:
>> Subject: Re: [PATCH 1/2] dt-bindings: arm: fsl: Update i.MX95
>> compatible
>>
>> On 04/01/2025 13:13, Peng Fan (OSS) wrote:
>>> From: Peng Fan <peng.fan@....com>
>>>
>>> i.MX95 features a System Controller and SCMI Spec 3.2 compatible
>>> firmware System Manager(SM) runs on the controller.
>>> Add "fsl,imx-sm" compatible string as fallback for "fsl,imx95" to
>>> indicate it is compatible with i.MX System Manager.
>>
>> I see little value in generic compatible like that. All these are
>> aarch64 so why not adding that compatible?
>>
>> How this generic compatible would be used?
>>
>> And by what exactly?
> 
> There will be more i.MX9 chips with System Manager. I would
> not expand the list here each time to support a new SoC.
> 
> https://elixir.bootlin.com/linux/v6.13-rc3/source/drivers/pinctrl/pinctrl-scmi.c#L508
> https://elixir.bootlin.com/linux/v6.13-rc3/source/drivers/pinctrl/freescale/pinctrl-imx-scmi.c#L290

Problem is that compatible is way too generic to be used by Linux drivers.

Best regards,
Krzysztof