linux-kernel - Re: [PATCH] cpufreq: ARM big LITTLE: Add generic cpufreq driver and its DT glue

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Message-ID: <CAKohpomp_DFi3GAJeTUiQowyEvfXcmTeuf9+O0qcXsXtbFkTDg@mail.gmail.com>
Date:	Fri, 8 Mar 2013 01:04:51 +0800
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	rjw@...k.pl, Steve.Bannister@....com, linux-pm@...r.kernel.org,
	Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>,
	Liviu.Dudau@....com, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org, robin.randhawa@....com,
	linux-arm-kernel@...ts.infradead.org, mark.hambleton@...adcom.com,
	linaro-kernel@...ts.linaro.org, charles.garcia-tobin@....com
Subject: Re: [PATCH] cpufreq: ARM big LITTLE: Add generic cpufreq driver and
 its DT glue

On 7 March 2013 19:49, Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> So how is this different from any other clock which may also return zero
> from its clk_get_rate() ?
>
> If that's the condition you want to check for, call clk_get_rate() after
> a successful clk_get*() and check for the condition.  Don't go treating
> the cookie somehow specially.  You're *assuming* a behaviour that is
> inappropriate for the side of the interface you're working with.

Okay. I will replace the earlier fixup with following:

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index fdf54a9..87b7e48 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -9,8 +9,7 @@ config ARM_BIG_LITTLE_CPUFREQ
 config ARM_DT_BL_CPUFREQ
        tristate "Generic ARM big LITTLE CPUfreq driver probed via DT"
        select ARM_BIG_LITTLE_CPUFREQ
-       depends on OF
-       default n
+       depends on OF && HAVE_CLK
        help
          This enables the Generic CPUfreq driver for ARM big.LITTLE platform.
          This gets frequency tables from DT.
diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
index 2486b9a..a41fd89 100644
--- a/drivers/cpufreq/arm_big_little.c
+++ b/drivers/cpufreq/arm_big_little.c
@@ -147,7 +147,7 @@ static void put_cluster_clk_and_freq_table(u32 cluster)

 static int get_cluster_clk_and_freq_table(u32 cluster)
 {
-       char name[9] = "cluster";
+       char name[9] = "cpu-cluster";
        int count;

        if (atomic_inc_return(&cluster_usage[cluster]) != 1)


For more clarity i will resend this patch now will all updates.
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