linux-kernel - Re: [PATCH 3/3] cpufreq: kirkwood: use the powersave multiplexer

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Date:	Tue, 2 Sep 2014 15:00:17 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Patch Tracking <patches@...aro.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH 3/3] cpufreq: kirkwood: use the powersave multiplexer

On Mon, Sep 1, 2014 at 9:49 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 2 September 2014 00:17, Mike Turquette <mturquette@...aro.org> wrote:
>
>> @@ -150,7 +146,7 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
>>                 err = PTR_ERR(priv.powersave_clk);
>>                 goto out_ddr;
>>         }
>> -       clk_prepare(priv.powersave_clk);
>> +       clk_prepare_enable(priv.powersave_clk);
>
> Shouldn't this be done in a separate patch? Or is this really related?

It is related. Before this change powersave_clk was modeled as a gate.
The separate clk_enable/clk_disable operations were used to toggle the
mux. This patch does two things:

1) remove the old gate-style powersave_clk in the clock driver and
replace with the mux-style powersave_clk data
2) update the cpufreq driver to handle the mux properly

So the change you pointed out above is part of #2.

These two changes are coupled in one patch to prevent git bisect breakage.

>
>>
>>         of_node_put(np);
>>         np = NULL;
>
> Other than that: Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>
> Yeah, you can take it through clock tree..

Cool.

Thanks,
Mike
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