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 | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c index ca96c3e66d683d6c1d1215b1b48d2f7b7f58d5b0..b744354b47c861370a247e1a6ce88563aa01c4aa 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.c +++ b/drivers/hwtracing/coresight/coresight-tnoc.c @@ -300,6 +300,28 @@ 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); + + return clk_prepare_enable(drvdata->pclk); +} +#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" }, {} @@ -313,6 +335,7 @@ static struct platform_driver itnoc_driver = { .name = "coresight-itnoc", .of_match_table = itnoc_of_match, .suppress_bind_attrs = true, + .pm = &itnoc_dev_pm_ops, }, };