linux-kernel - [PATCH v2 2/3] coresight: refactor with function of_coresight_get

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Date:   Tue, 28 Feb 2017 23:06:59 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, mike.leach@...aro.org
Subject: [PATCH v2 2/3] coresight: refactor with function of_coresight_get_cpu

This is refactor to add function of_coresight_get_cpu(), so it's used to
retrieve CPU id for coresight component. Finally can use it as a common
function for multiple places.

Suggested-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 drivers/hwtracing/coresight/of_coresight.c | 35 ++++++++++++++++++++----------
 include/linux/coresight.h                  |  2 ++
 2 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index 629e031..2e7bbe2 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -101,14 +101,34 @@ static int of_coresight_alloc_memory(struct device *dev,
 	return 0;
 }
 
+int of_coresight_get_cpu(struct device_node *node)
+{
+	int cpu;
+	struct device_node *dn;
+
+	dn = of_parse_phandle(node, "cpu", 0);
+
+	/* Affinity defaults to CPU0 */
+	if (!dn)
+		return 0;
+
+	for_each_possible_cpu(cpu) {
+		if (dn == of_get_cpu_node(cpu, NULL))
+			break;
+	}
+	of_node_put(dn);
+
+	return cpu;
+}
+EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
+
 struct coresight_platform_data *of_get_coresight_platform_data(
 				struct device *dev, struct device_node *node)
 {
-	int i = 0, ret = 0, cpu;
+	int i = 0, ret = 0;
 	struct coresight_platform_data *pdata;
 	struct of_endpoint endpoint, rendpoint;
 	struct device *rdev;
-	struct device_node *dn;
 	struct device_node *ep = NULL;
 	struct device_node *rparent = NULL;
 	struct device_node *rport = NULL;
@@ -175,16 +195,7 @@ struct coresight_platform_data *of_get_coresight_platform_data(
 		} while (ep);
 	}
 
-	/* Affinity defaults to CPU0 */
-	pdata->cpu = 0;
-	dn = of_parse_phandle(node, "cpu", 0);
-	for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
-		if (dn == of_get_cpu_node(cpu, NULL)) {
-			pdata->cpu = cpu;
-			break;
-		}
-	}
-	of_node_put(dn);
+	pdata->cpu = of_coresight_get_cpu(node);
 
 	return pdata;
 }
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 2a5982c..6709561 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -263,11 +263,13 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset,
 #endif
 
 #ifdef CONFIG_OF
+extern int of_coresight_get_cpu(struct device_node *node);
 extern struct coresight_platform_data *of_get_coresight_platform_data(
 				struct device *dev, struct device_node *node);
 #else
 static inline struct coresight_platform_data *of_get_coresight_platform_data(
 	struct device *dev, struct device_node *node) { return NULL; }
+static int of_coresight_get_cpu(struct device_node *node) { return 0; }
 #endif
 
 #ifdef CONFIG_PID_NS
-- 
2.7.4