coresight: catu: Support atclk

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")
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250731-arm_cs_fix_clock_v4-v6-2-1dfe10bb3f6f@arm.com

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 5058432233da1932f1965008fc1b98b560490414..af2a55f0c907c392d092a50612b23c115a1b0f5f 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -520,6 +520,10 @@ 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;
@@ -668,18 +672,26 @@ 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 755776cd19c5bb724845ca586ace1e0b29e72556..6e6b7aac206dcae9ff062355e50179637b4d1703 100644 (file)
--- 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;