[RFC PATCH v2 13/15] cpufreq: maple-cpufreq: remove device tree parsing for cpu nodes

[Sudeep.KarkadaNagesha at arm.com]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha at arm.com>

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.

Cc: Viresh Kumar <viresh.kumar at linaro.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov at gmail.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha at arm.com>
---
 drivers/cpufreq/maple-cpufreq.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/cpufreq/maple-cpufreq.c b/drivers/cpufreq/maple-cpufreq.c
index cdd6291..bc7233b 100644
--- a/drivers/cpufreq/maple-cpufreq.c
+++ b/drivers/cpufreq/maple-cpufreq.c
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
+#include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/init.h>
 #include <linux/completion.h>
@@ -201,7 +202,7 @@ static struct cpufreq_driver maple_cpufreq_driver = {
 
 static int __init maple_cpufreq_init(void)
 {
-	struct device_node *cpus;
+	struct device *cpu_dev;
 	struct device_node *cpunode;
 	unsigned int psize;
 	unsigned long max_freq;
@@ -217,24 +218,17 @@ static int __init maple_cpufreq_init(void)
 	    !of_machine_is_compatible("Momentum,Apache"))
 		return 0;
 
-	cpus = of_find_node_by_path("/cpus");
-	if (cpus == NULL) {
-		DBG("No /cpus node !\n");
+	cpu_dev = get_cpu_device(0);
+	if (!cpu_dev) {
+		pr_err("failed to get cpu device\n");
 		return -ENODEV;
 	}
 
 	/* Get first CPU node */
-	for (cpunode = NULL;
-	     (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) {
-		const u32 *reg = of_get_property(cpunode, "reg", NULL);
-		if (reg == NULL || (*reg) != 0)
-			continue;
-		if (!strcmp(cpunode->type, "cpu"))
-			break;
-	}
+	cpunode = of_node_get(cpu_dev->of_node);
 	if (cpunode == NULL) {
 		printk(KERN_ERR "cpufreq: Can't find any CPU 0 node\n");
-		goto bail_cpus;
+		goto bail_noprops;
 	}
 
 	/* Check 970FX for now */
@@ -290,14 +284,11 @@ static int __init maple_cpufreq_init(void)
 	rc = cpufreq_register_driver(&maple_cpufreq_driver);
 
 	of_node_put(cpunode);
-	of_node_put(cpus);
 
 	return rc;
 
 bail_noprops:
 	of_node_put(cpunode);
-bail_cpus:
-	of_node_put(cpus);
 
 	return rc;
 }
-- 
1.8.1.2