[PATCH v3 13/16] cpufreq: arm_big_little: remove device tree parsing for cpu nodes

From: Sudeep KarkadaNagesha
Date: Mon Jul 22 2013 - 07:33:36 EST


From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@xxxxxxx>

Now that the cpu device registration initialises the of_node(if available)
appropriately for all the cpus, parsing here is redundant.

This patch removes all DT parsing and uses cpu->of_node instead.

Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@xxxxxxx>
---
drivers/cpufreq/arm_big_little_dt.c | 40 +++++++++++++------------------------
1 file changed, 14 insertions(+), 26 deletions(-)

diff --git a/drivers/cpufreq/arm_big_little_dt.c b/drivers/cpufreq/arm_big_little_dt.c
index fd9e3ea..480c0bd 100644
--- a/drivers/cpufreq/arm_big_little_dt.c
+++ b/drivers/cpufreq/arm_big_little_dt.c
@@ -19,12 +19,11 @@

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

-#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
-#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/opp.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -34,27 +33,13 @@
/* get cpu node with valid operating-points */
static struct device_node *get_cpu_node_with_valid_op(int cpu)
{
- struct device_node *np = NULL, *parent;
- int count = 0;
+ struct device_node *np = of_cpu_device_node_get(cpu);

- parent = of_find_node_by_path("/cpus");
- if (!parent) {
- pr_err("failed to find OF /cpus\n");
- return NULL;
+ if (!of_get_property(np, "operating-points", NULL)) {
+ of_node_put(np);
+ np = NULL;
}

- for_each_child_of_node(parent, np) {
- if (count++ != cpu)
- continue;
- if (!of_get_property(np, "operating-points", NULL)) {
- of_node_put(np);
- np = NULL;
- }
-
- break;
- }
-
- of_node_put(parent);
return np;
}

@@ -63,11 +48,12 @@ static int dt_init_opp_table(struct device *cpu_dev)
struct device_node *np;
int ret;

- np = get_cpu_node_with_valid_op(cpu_dev->id);
- if (!np)
- return -ENODATA;
+ np = of_node_get(cpu_dev->of_node);
+ if (!np) {
+ pr_err("failed to find cpu%d node\n", cpu_dev->id);
+ return -ENOENT;
+ }

- cpu_dev->of_node = np;
ret = of_init_opp_table(cpu_dev);
of_node_put(np);

@@ -79,9 +65,11 @@ static int dt_get_transition_latency(struct device *cpu_dev)
struct device_node *np;
u32 transition_latency = CPUFREQ_ETERNAL;

- np = get_cpu_node_with_valid_op(cpu_dev->id);
- if (!np)
+ np = of_node_get(cpu_dev->of_node);
+ if (!np) {
+ pr_info("Failed to find cpu node. Use CPUFREQ_ETERNAL transition latency\n");
return CPUFREQ_ETERNAL;
+ }

of_property_read_u32(np, "clock-latency", &transition_latency);
of_node_put(np);
--
1.8.1.2


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