From 4d9024d14d1bacb097f33ef7d3ed1696d6a46c88 Mon Sep 17 00:00:00 2001 From: Yuanfang Zhang Date: Wed, 3 Dec 2025 20:43:09 -0800 Subject: [PATCH] coresight-tnoc: Add runtime PM support for Interconnect TNOC 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 Reviewed-by: Leo Yan Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20251203-itnoc-v5-3-5b97c63f2268@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 affd8204b534..1128612e70a7 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.c +++ b/drivers/hwtracing/coresight/coresight-tnoc.c @@ -305,6 +305,28 @@ 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" }, {} @@ -318,6 +340,7 @@ static struct platform_driver itnoc_driver = { .name = "coresight-itnoc", .of_match_table = itnoc_of_match, .suppress_bind_attrs = true, + .pm = &itnoc_dev_pm_ops, }, }; -- 2.47.3