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

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Message-ID: <20250109024058.GA31833@localhost.localdomain>
Date: Thu, 9 Jan 2025 10:40:58 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Peng Fan <peng.fan@....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>,
	"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 Mon, Jan 06, 2025 at 07:12:29AM +0100, Krzysztof Kozlowski wrote:
>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.

Is "fsl,imx9-sm" feasible here?

Thanks,
Peng

>
>Best regards,
>Krzysztof