linux-kernel - Re: [PATCH v2 2/4] firmware: arm_scmi: Add machine_allowlist and machine

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Message-ID: <119bdeb3-f1d4-4f35-bff3-190eccc7c325@stanley.mountain>
Date: Thu, 6 Feb 2025 14:46:27 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Peng Fan <peng.fan@....nxp.com>
Cc: Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Saravana Kannan <saravanak@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dong Aisheng <aisheng.dong@....com>,
	Fabio Estevam <festevam@...il.com>, Shawn Guo <shawnguo@...nel.org>,
	Jacky Bai <ping.bai@....com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Sascha Hauer <s.hauer@...gutronix.de>, arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, imx@...ts.linux.dev,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v2 2/4] firmware: arm_scmi: Add machine_allowlist and
 machine_blocklist

On Thu, Feb 06, 2025 at 02:40:11PM +0300, Dan Carpenter wrote:
> On Thu, Feb 06, 2025 at 07:05:08PM +0800, Peng Fan wrote:
> > Hi Dan,
> > 
> > On Thu, Feb 06, 2025 at 11:02:04AM +0300, Dan Carpenter wrote:
> > >On Mon, Jan 20, 2025 at 03:13:30PM +0800, Peng Fan (OSS) wrote:
> > >> From: Peng Fan <peng.fan@....com>
> > >> 
> > >> There are two cases:
> > >> pinctrl-scmi.c and pinctrl-imx-scmi.c, both use SCMI_PROTOCOL_PINCTRL.
> > >> If both drivers are built in, and the scmi device with name "pinctrl-imx"
> > >> is created earlier, and the fwnode device points to the scmi device,
> > >> non-i.MX platforms will never have the pinctrl supplier ready.
> > >> 
> > >> Vendor A use 0x80 for feature X, Vendor B use 0x80 for feature Y.
> > >> With both drivers built in, two scmi devices will be created, and both
> > >> drivers will be probed. On A's patform, feature Y probe may fail, vice
> > >> verus.
> > >> 
> > >> Introduce machine_allowlist and machine_blocklist to allow or block
> > >> the creation of scmi devices to address above issues.
> > >> 
> > >> machine_blocklist is non-vendor protocols, but vendor has its own
> > >> implementation. Saying need to block pinctrl-scmi.c on i.MX95.
> > >> machine_allowlist is for vendor protocols. Saying vendor A drivers only
> > >> allow vendor A machine, vendor B machines only allow vendor B machine.
> > >> 
> > >
> > >I think patches 2-4 should be combined into one patch.  This commit
> > 
> > They are in different subsystems, so I separate them.
> > 
> 
> I mean if the i.MX driver prevents the generic driver from working then
> we need a Fixes tag.  It really makes it simpler to understand and backport
> if they're sent as one patch.  Normally we would collect Acks from the
> maintainers who're involved and but still do it as one patch.
> 

Wait.  Just to be clear.  Does PATCH 1/4 fix that bug so that when both
are built-in then the generic driver works?  This is in some ways an
alternative way to fix the same bug as well as being a cleanup?

regards,
dan carpenter