cpufreq: Implement light weight ->target_index() routine

Currently, the prototype of cpufreq_drivers target routines is:

int target(struct cpufreq_policy *policy, unsigned int target_freq,
		unsigned int relation);

And most of the drivers call cpufreq_frequency_table_target() to get a valid
index of their frequency table which is closest to the target_freq. And they
don't use target_freq and relation after that.

So, it makes sense to just do this work in cpufreq core before calling
cpufreq_frequency_table_target() and simply pass index instead. But this can be
done only with drivers which expose their frequency table with cpufreq core. For
others we need to stick with the old prototype of target() until those drivers
are converted to expose frequency tables.

This patch implements the new light weight prototype for target_index() routine.
It looks like this:

int target_index(struct cpufreq_policy *policy, unsigned int index);

CPUFreq core will call cpufreq_frequency_table_target() before calling this
routine and pass index to it. Because CPUFreq core now requires to call routines
present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time.

This also marks target() interface as deprecated. So, that new drivers avoid
using it. And Documentation is updated accordingly.

It also converts existing .target() to newly defined light weight
.target_index() routine for many driver.

Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>

1 files changed, 2 insertions, 17 deletions

diff --git a/drivers/cpufreq/sc520_freq.c b/drivers/cpufreq/sc520_freq.c
index 9047ab1ca014..6c86452e1737 100644
--- a/drivers/cpufreq/sc520_freq.c
+++ b/drivers/cpufreq/sc520_freq.c
@@ -53,8 +53,7 @@ static unsigned int sc520_freq_get_cpu_frequency(unsigned int cpu)
 	}
 }
 
-static void sc520_freq_set_cpu_state(struct cpufreq_policy *policy,
-		unsigned int state)
+static int sc520_freq_target(struct cpufreq_policy *policy, unsigned int state)
 {
 
 	struct cpufreq_freqs	freqs;
@@ -76,24 +75,10 @@ static void sc520_freq_set_cpu_state(struct cpufreq_policy *policy,
 	local_irq_enable();
 
 	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-};
-
-static int sc520_freq_target(struct cpufreq_policy *policy,
-			    unsigned int target_freq,
-			    unsigned int relation)
-{
-	unsigned int newstate = 0;
-
-	if (cpufreq_frequency_table_target(policy, sc520_freq_table,
-				target_freq, relation, &newstate))
-		return -EINVAL;
-
-	sc520_freq_set_cpu_state(policy, newstate);
 
 	return 0;
 }
 
-
 /*
  *	Module init and exit code
  */
@@ -117,7 +102,7 @@ static int sc520_freq_cpu_init(struct cpufreq_policy *policy)
 static struct cpufreq_driver sc520_freq_driver = {
 	.get	= sc520_freq_get_cpu_frequency,
 	.verify	= cpufreq_generic_frequency_table_verify,
-	.target	= sc520_freq_target,
+	.target_index = sc520_freq_target,
 	.init	= sc520_freq_cpu_init,
 	.exit	= cpufreq_generic_exit,
 	.name	= "sc520_freq",