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[v1,2/9] coresight: catu: Support atclk

Message ID 20250327113803.1452108-3-leo.yan@arm.com (mailing list archive)
State New
Headers show
Series coresight: Fix and improve clock usage | expand

Commit Message

Leo Yan March 27, 2025, 11:37 a.m. UTC
The atclk is an optional clock for the CoreSight CATU, but the driver
misses to initialize it.

This change enables atclk in probe of the CATU driver, and dynamically
control the clock during suspend and resume.

The checks for driver data and clocks in suspend and resume are not
needed, remove them.  Add error handling in the resume function.

Fixes: fcacb5c154ba ("coresight: Introduce support for Coresight Address Translation Unit")
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c | 22 +++++++++++++++++-----
 drivers/hwtracing/coresight/coresight-catu.h |  1 +
 2 files changed, 18 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index fa170c966bc3..9fcda5e49253 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -513,6 +513,10 @@  static int __catu_probe(struct device *dev, struct resource *res)
 	struct coresight_platform_data *pdata = NULL;
 	void __iomem *base;
 
+	drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
+	if (IS_ERR(drvdata->atclk))
+		return PTR_ERR(drvdata->atclk);
+
 	catu_desc.name = coresight_alloc_device_name(&catu_devs, dev);
 	if (!catu_desc.name)
 		return -ENOMEM;
@@ -659,18 +663,26 @@  static int catu_runtime_suspend(struct device *dev)
 {
 	struct catu_drvdata *drvdata = dev_get_drvdata(dev);
 
-	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
-		clk_disable_unprepare(drvdata->pclk);
+	clk_disable_unprepare(drvdata->atclk);
+	clk_disable_unprepare(drvdata->pclk);
+
 	return 0;
 }
 
 static int catu_runtime_resume(struct device *dev)
 {
 	struct catu_drvdata *drvdata = dev_get_drvdata(dev);
+	int ret;
 
-	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
-		clk_prepare_enable(drvdata->pclk);
-	return 0;
+	ret = clk_prepare_enable(drvdata->pclk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(drvdata->atclk);
+	if (ret)
+		clk_disable_unprepare(drvdata->pclk);
+
+	return ret;
 }
 #endif
 
diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h
index 141feac1c14b..2fe31fed6cf1 100644
--- a/drivers/hwtracing/coresight/coresight-catu.h
+++ b/drivers/hwtracing/coresight/coresight-catu.h
@@ -62,6 +62,7 @@ 
 
 struct catu_drvdata {
 	struct clk *pclk;
+	struct clk *atclk;
 	void __iomem *base;
 	struct coresight_device *csdev;
 	int irq;