Re: [PATCH v3 04/11] coresight-tpdm: Add reset node to TPDM node

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On 23/03/2023 06:04, Tao Zhang wrote:
TPDM device need a node to reset the configurations and status of
it. This change provides a node to reset the configurations and
disable the TPDM if it has been enabled.

Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
---
  drivers/hwtracing/coresight/coresight-tpdm.c | 28 ++++++++++++++++++++++++++++
  1 file changed, 28 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 5e1e2ba..104638d 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -161,6 +161,33 @@ static void tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
  	drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0);
  }
+static ssize_t reset_store(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf,
+					  size_t size)
+{
+	int ret = 0;
+	unsigned long val;
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	ret = kstrtoul(buf, 10, &val);
+	if (ret || val != 1)
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	/* Reset all datasets to ZERO, and init the default data*/
+	tpdm_init_datasets(drvdata);

With the suggested rename in the previous patch, you wouldn't need
a comment here.

+
+	spin_unlock(&drvdata->spinlock);
+


+	/* Disable tpdm if enabled */
+	if (drvdata->enable)
+		coresight_disable(drvdata->csdev);

Couldn't this be done via disable_source ? Please don't overload
the sysfs handle.

+
+	return size;
+}
+static DEVICE_ATTR_WO(reset);

Documentation for the sysfs node please ?

Suzuki




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