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@oss.qualcomm.com --- 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, }, };