linux-kernel - Re: [PATCH] cpufreq: scmi: Skip SCMI devices that aren't used by the CPUs

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Message-ID: <20250414-splendid-clam-of-democracy-dacf96@sudeepholla>
Date: Mon, 14 Apr 2025 09:23:24 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Peng Fan <peng.fan@....nxp.com>
Cc: Mike Tipton <quic_mdtipton@...cinc.com>,
	Cristian Marussi <cristian.marussi@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>, <arm-scmi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: scmi: Skip SCMI devices that aren't used by the
 CPUs

Hi Peng,

On Mon, Apr 14, 2025 at 04:38:32PM +0800, Peng Fan wrote:
> Hi Mike,
> On Fri, Apr 11, 2025 at 02:29:41PM -0700, Mike Tipton wrote:
> >Currently, all SCMI devices with performance domains attempt to register
> >a cpufreq driver,
> 
> The scmi cpufreq device is created based on entry
> { SCMI_PROTOCOL_PERF, "cpufreq" },
> 
> So the scmi-cpufreq driver could only probe the upper single device.
> 
> How could the driver work with all SCMI devices with performance domains?
> 

IIUC, this is on a system with multiple SCMI servers/providers some of
which don't deal with CPU performance domains at all.

-- 
Regards,
Sudeep