This patch adds runtime power management support for platform-based
CoreSight Interconnect TNOC (ITNOC) devices. It introduces suspend and
resume callbacks to manage the APB clock (`pclk`) during device runtime
transitions.
Signed-off-by: Yuanfang Zhang <yuanfang.zhang@xxxxxxxxxxxxxxxx>
---
drivers/hwtracing/coresight/coresight-tnoc.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c
index aa6f48d838c00d71eff22c18e34e00b93755fd82..f12a1698824bc678545319a3f482fd27e67a7352 100644
--- a/drivers/hwtracing/coresight/coresight-tnoc.c
+++ b/drivers/hwtracing/coresight/coresight-tnoc.c
@@ -270,6 +270,31 @@ static void itnoc_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
}
+#ifdef CONFIG_PM
+static int itnoc_runtime_suspend(struct device *dev)
+{
+ struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(drvdata->pclk);
+
+ return 0;
+}
+
+static int itnoc_runtime_resume(struct device *dev)
+{
+ struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(drvdata->pclk);
+
+ return ret;
+}
+#endif
+
+static const struct dev_pm_ops itnoc_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(itnoc_runtime_suspend, itnoc_runtime_resume, NULL)
+};
+
static const struct of_device_id itnoc_of_match[] = {
{ .compatible = "qcom,coresight-itnoc" },
{}
@@ -282,6 +307,7 @@ static struct platform_driver itnoc_driver = {
.driver = {
.name = "coresight-itnoc",
.of_match_table = itnoc_of_match,
+ .pm = &itnoc_dev_pm_ops,
},
};
--
2.34.1
