linux-kernel - Re: [PATCH v2 1/4] cpufreq: pxa: use generic platdev driver for device-tree

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Message-ID: <20161020033435.GD11766@vireshk-i7>
Date:   Thu, 20 Oct 2016 09:04:35 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:     Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rafael Wysocki <rjw@...ysocki.net>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 1/4] cpufreq: pxa: use generic platdev driver for
 device-tree

On 19-10-16, 22:06, Robert Jarzmik wrote:
> Viresh Kumar <viresh.kumar@...aro.org> writes:
> 
> >> >> +	{ .compatible = "marvell,pxa250", },
> >> >> +	{ .compatible = "marvell,pxa270", },
> >> >>  
> >> >>  	{ .compatible = "samsung,exynos3250", },
> >> >>  	{ .compatible = "samsung,exynos4210", },
> >> >
> >> > Isn't there a race between cpufreq-dt and the platform driver to
> >> > register first ?
> >> Ah, could you be more specific about the race you're talking of ?
> >> 
> >> My understanding was that cpufreq-dt-platdev does create the device, and
> >> cpufreq-dt is a driver for it, so there is no race but a direct relationship
> >> AFAIU.
> >
> > I mean that both the driver may try to register to the cpufreq core if
> > they are both compiled in a single image.
> Euh I still don't follow you. The only driver that can register to the cpufreq
> core is cpufreq-dt.

I was wondering on what will happen if both cpufreq-dt and your pxa2xx-cpufreq
driver are present in the same kernel image. In that case the init routines of
both of them will try to call cpufreq_register_driver().

-- 
viresh