[PATCH V5 1/6] csky: Init pmu as a device

[Mao Han]

This patch change the csky pmu initialization from arch init to
device init. The pmu can be configued with information from
device tree(pmu device name, irq number and etc.).

Signed-off-by: Mao Han <han_mao@xxxxxxxxx>
Cc: Guo Ren <guoren@xxxxxxxxxx>
---
 arch/csky/kernel/perf_event.c | 50 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

diff --git a/arch/csky/kernel/perf_event.c b/arch/csky/kernel/perf_event.c
index 376c972..2282554 100644
--- a/arch/csky/kernel/perf_event.c
+++ b/arch/csky/kernel/perf_event.c
@@ -949,7 +949,7 @@ static int csky_pmu_add(struct perf_event *event, int flags)
 	return 0;
 }
 
-int __init init_hw_perf_events(void)
+int init_hw_perf_events(void)
 {
 	csky_pmu.pmu = (struct pmu) {
 		.pmu_enable	= csky_pmu_enable,
@@ -1028,4 +1028,50 @@ int __init init_hw_perf_events(void)
 
 	return perf_pmu_register(&csky_pmu.pmu, "cpu", PERF_TYPE_RAW);
 }
-arch_initcall(init_hw_perf_events);
+
+int csky_pmu_device_probe(struct platform_device *pdev,
+			  const struct of_device_id *of_table)
+{
+	int ret;
+
+	ret = init_hw_perf_events();
+	if (ret) {
+		pr_notice("[perf] failed to probe PMU!\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+const static struct of_device_id csky_pmu_of_device_ids[] = {
+	{.compatible = "csky,csky-pmu"},
+	{},
+};
+
+static int csky_pmu_dev_probe(struct platform_device *pdev)
+{
+	return csky_pmu_device_probe(pdev, csky_pmu_of_device_ids);
+}
+
+static struct platform_driver csky_pmu_driver = {
+	.driver = {
+		   .name = "csky-pmu",
+		   .of_match_table = csky_pmu_of_device_ids,
+		   },
+	.probe = csky_pmu_dev_probe,
+};
+
+static int __init csky_pmu_probe(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&csky_pmu_driver);
+	if (ret)
+		pr_notice("[perf] PMU initialization failed\n");
+	else
+		pr_notice("[perf] PMU initialization done\n");
+
+	return ret;
+}
+
+device_initcall(csky_pmu_probe);
-- 
2.7.4