linux-kernel - Re: [PATCH V3 14/16] cpufreq: Allow drivers to enable boost support after registering driver

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Message-ID: <20150731061238.GN3159@codeaurora.org>
Date:	Thu, 30 Jul 2015 23:12:38 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Rafael Wysocki <rjw@...ysocki.net>, linaro-kernel@...ts.linaro.org,
	linux-pm@...r.kernel.org, rob.herring@...aro.org,
	arnd.bergmann@...aro.org, nm@...com, broonie@...nel.org,
	mturquette@...libre.com, Sudeep.Holla@....com,
	viswanath.puttagunta@...aro.org, l.stach@...gutronix.de,
	thomas.petazzoni@...e-electrons.com,
	linux-arm-kernel@...ts.infradead.org, ta.omasab@...il.com,
	kesavan.abhilash@...il.com, khilman@...aro.org,
	santosh.shilimkar@...cle.com, b.zolnierkie@...sung.com,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 14/16] cpufreq: Allow drivers to enable boost support
 after registering driver

On 07/29, Viresh Kumar wrote:
> In some cases it wouldn't be known at time of driver registration, if
> the driver needs to support boost frequencies.
> 
> For example, while getting boost information from DT with opp-v2
> bindings, we need to parse the bindings for all the CPUs to know if
> turbo/boost OPPs are supported or not.
> 
> One way out to do that efficiently is to delay supporting boost mode
> (i.e. creating /sys/devices/system/cpu/cpufreq/boost file), until the
> time OPP bindings are parsed.
> 
> At that point, the driver can enable boost support. This can be done at
> ->init(), where the frequency table is created.
> 
> To do that, the driver requires few APIs from cpufreq core that let him
> do this. This patch provides these APIs.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---

Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>

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