linux-kernel - Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does not exist

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Date:   Thu, 14 Oct 2021 16:03:36 +0900
From:   Hector Martin <marcan@...can.st>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Sibi Sankar <sibis@...eaurora.org>,
        Saravana Kannan <saravanak@...gle.com>,
        linux-arm-kernel@...ts.infradead.org,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Sven Peter <sven@...npeter.dev>, Marc Zyngier <maz@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does
 not exist

On 14/10/2021 15.56, Viresh Kumar wrote:
>> +	/*
>> +	 * Attach the CPU device to its genpd domain (if any), to allow OPP
>> +	 * dependencies to be satisfied.
>> +	 */
>> +	ret = genpd_dev_pm_attach(cpu_dev);
>> +	if (ret <= 0) {
>> +		dev_err(cpu_dev, "Failed to attach CPU device to genpd\n");
>> +		goto out;
>> +	}
>> +
> 
> Other platform do this from some other place I think.
> 
> Ulf, where should this code be moved ? cpu-clk driver ?
> 

I see one driver that does this is drivers/clk/qcom/apcs-sdx55.c (via 
dev_pm_domain_attach). Though it only does it for CPU#0; we need to do 
it for all CPUs.

-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub