linux-kernel - Re: [PATCH] cpufreq: qoriq: enhance bus frequency calculation

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Message-ID: <20170310100511.GD3341@vireshk-i7>
Date:   Fri, 10 Mar 2017 15:35:11 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Andy Tang <andy.tang@....com>
Cc:     "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] cpufreq: qoriq: enhance bus frequency calculation

On 10-03-17, 01:44, Andy Tang wrote:
> > Will this always work? If yes, then what about dropping the code parsing DT
> > completely ? That is, just rely on clk_get_rate() in all cases.
> > 
> We put all the clock tree configuration in driver, not in dts.
> cg-pll0-div1 is hardcoded in driver since we don't depend on dts.
> We kind of don't have other choices but use the hardcode clock name
> here too.

Looks like you misread my comment. Let me try again. Will it be fine
to write get_bus_freq() this way?

static u32 get_bus_freq(void)
{
	struct clk *pltclk;

	/* get platform freq by its clock name */
	pltclk = clk_get(NULL, "cg-pll0-div1");
	if (IS_ERR(pltclk)) {
		pr_err("%s: can't get bus frequency %ld\n",
		       __func__, PTR_ERR(pltclk));
		return PTR_ERR(pltclk);
	}

	return clk_get_rate(pltclk);
}

-- 
viresh