linux-kernel - Re: [PATCH v5 0/3] pinctrl: scmi: support i.MX95 OEM extensions

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Date: Wed, 8 May 2024 13:22:12 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Peng Fan <peng.fan@....com>
Cc: "Peng Fan (OSS)" <peng.fan@....nxp.com>,
	Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....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>,
	Linus Walleij <linus.walleij@...aro.org>,
	Aisheng Dong <aisheng.dong@....com>, Jacky Bai <ping.bai@....com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"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-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v5 0/3] pinctrl: scmi: support i.MX95 OEM extensions

On Wed, May 08, 2024 at 09:41:24AM +0000, Peng Fan wrote:
> Hi Sudeep,
>
> > Subject: Re: [PATCH v5 0/3] pinctrl: scmi: support i.MX95 OEM extensions
> >
> > On Wed, May 08, 2024 at 11:32:01AM +0800, Peng Fan (OSS) wrote:
> > > ARM SCMI v3.2 Table 24 Pin Configuration Type and Enumerations:
> > > '192 -255 OEM specific units'.
> > >
> > > i.MX95 System Manager FW supports SCMI PINCTRL protocol, but it has
> > > zero functions, groups. So pinctrl-scmi.c could not be reused for i.MX95.
> > > Because nxp,pin-func, nxp,pin-conf properties are rejected by dt
> > > maintainers, so use generic property 'pinmux' which requires a new
> > > driver pinctrl-imx-scmi.c
> > >
> >
> > Not a review in particular, but if we decide to merge this deviation, it must be
> > under the condition that it can be deleted anytime in the future if this
> > becomes annoyance(like other vendors using this as a way to deviate from
> > the specification). If we can't agree with that, then we better not merge this
> > at all.
>
> It is ok for me. I agree.
> But actually this driver still follows Spec by using OEM extensions.
>

Agreed, but that's what I call as deviations. When such extensions are
used as baseline implementation, it becomes deviations.

--
Regards,
Sudeep