cpufreq: instantiate cpufreq-cpu0 as a platform_driver

As multiplatform build is being adopted by more and more ARM platforms,
initcall function should be used very carefully.  For example, when
GENERIC_CPUFREQ_CPU0 is built in the kernel, cpu0_cpufreq_driver_init()
will be called on all the platforms to initialize cpufreq-cpu0 driver.

To eliminate this undesired the effect, the patch changes cpufreq-cpu0
driver to have it instantiated as a platform_driver.  Then it will only
run on platforms that create the platform_device "cpufreq-cpu0".

Along with the change, it also changes cpu_dev to be &pdev->dev,
so that managed functions can start working, and module build gets
supported too.

The highbank-cpufreq driver is also updated accordingly to adapt the
changes on cpufreq-cpu0.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 29 insertions, 13 deletions

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index e0a899f25e37..cbcb21e32771 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -185,7 +185,7 @@ config CPU_FREQ_GOV_CONSERVATIVE
           If in doubt, say N.
 
 config GENERIC_CPUFREQ_CPU0
-        bool "Generic CPU0 cpufreq driver"
+        tristate "Generic CPU0 cpufreq driver"
         depends on HAVE_CLK && REGULATOR && PM_OPP && OF
         select CPU_FREQ_TABLE
         help
diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
index 38ae178ce4ef..a108f66271ee 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -12,12 +12,12 @@
 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
 
 #include <linux/clk.h>
-#include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/opp.h>
+#include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
@@ -177,7 +177,7 @@ static struct cpufreq_driver cpu0_cpufreq_driver = {
         .attr = cpu0_cpufreq_attr,
 };
 
-static int cpu0_cpufreq_driver_init(void)
+static int cpu0_cpufreq_probe(struct platform_device *pdev)
 {
         struct device_node *np;
         int ret;
@@ -192,23 +192,17 @@ static int cpu0_cpufreq_driver_init(void)
                 return -ENOENT;
         }
 
-        cpu_dev = get_cpu_device(0);
-        if (!cpu_dev) {
-                pr_err("failed to get cpu0 device\n");
-                ret = -ENODEV;
-                goto out_put_node;
-        }
-
+        cpu_dev = &pdev->dev;
         cpu_dev->of_node = np;
 
-        cpu_clk = clk_get(cpu_dev, NULL);
+        cpu_clk = devm_clk_get(cpu_dev, NULL);
         if (IS_ERR(cpu_clk)) {
                 ret = PTR_ERR(cpu_clk);
                 pr_err("failed to get cpu0 clock: %d\n", ret);
                 goto out_put_node;
         }
 
-        cpu_reg = regulator_get(cpu_dev, "cpu0");
+        cpu_reg = devm_regulator_get(cpu_dev, "cpu0");
         if (IS_ERR(cpu_reg)) {
                 pr_warn("failed to get cpu0 regulator\n");
                 cpu_reg = NULL;
@@ -271,7 +265,24 @@ out_put_node:
         of_node_put(np);
         return ret;
 }
-late_initcall(cpu0_cpufreq_driver_init);
+
+static int cpu0_cpufreq_remove(struct platform_device *pdev)
+{
+        cpufreq_unregister_driver(&cpu0_cpufreq_driver);
+        opp_free_cpufreq_table(cpu_dev, &freq_table);
+
+        return 0;
+}
+
+static struct platform_driver cpu0_cpufreq_platdrv = {
+        .driver = {
+                .name   = "cpufreq-cpu0",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = cpu0_cpufreq_probe,
+        .remove         = cpu0_cpufreq_remove,
+};
+module_platform_driver(cpu0_cpufreq_platdrv);
 
 MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
 MODULE_DESCRIPTION("Generic CPU0 cpufreq driver");
diff --git a/drivers/cpufreq/highbank-cpufreq.c b/drivers/cpufreq/highbank-cpufreq.c
index 53f25e5aa6b7..66e3a71b81a3 100644
--- a/drivers/cpufreq/highbank-cpufreq.c
+++ b/drivers/cpufreq/highbank-cpufreq.c
@@ -20,6 +20,7 @@
 #include <linux/err.h>
 #include <linux/of.h>
 #include <linux/mailbox.h>
+#include <linux/platform_device.h>
 
 #define HB_CPUFREQ_CHANGE_NOTE  0x80000001
 #define HB_CPUFREQ_IPC_LEN      7
@@ -65,6 +66,7 @@ static struct notifier_block hb_cpufreq_clk_nb = {
 
 static int hb_cpufreq_driver_init(void)
 {
+        struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
         struct device *cpu_dev;
         struct clk *cpu_clk;
         struct device_node *np;
@@ -104,6 +106,9 @@ static int hb_cpufreq_driver_init(void)
                 goto out_put_node;
         }
 
+        /* Instantiate cpufreq-cpu0 */
+        platform_device_register_full(&devinfo);
+
 out_put_node:
         of_node_put(np);
         return ret;