linux-kernel - [PATCH v1 1/2] coresight: Add support for device names

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Message-Id: <1618561362-1561-2-git-send-email-taozha@codeaurora.org>
Date:   Fri, 16 Apr 2021 16:22:41 +0800
From:   Tao Zhang <taozha@...eaurora.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Tao Zhang <taozha@...eaurora.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Tingwei Zhang <tingwei@...eaurora.org>,
        Mao Jinlong <jinlmao@...eaurora.org>,
        Yuanfang Zhang <zhangyuanfang@...eaurora.org>
Subject: [PATCH v1 1/2] coresight: Add support for device names

Add support to read device names from device tree entries. Before
the previous process of allocating coresight device name, try to
read the coresight device name from device tree entries. If it is
read, the device name will be returned directly. If it is not read,
the original allocation name process will be followed.

Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org>
Signed-off-by: Tao Zhang <taozha@...eaurora.org>
---
 drivers/hwtracing/coresight/coresight-core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 4ba801d..b79c726 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1640,6 +1640,12 @@ char *coresight_alloc_device_name(struct coresight_dev_list *dict,
 	int idx;
 	char *name = NULL;
 	struct fwnode_handle **list;
+	struct device_node *node = dev->of_node;
+
+	if (!node) {
+		if (!of_property_read_string(node, "coresight-name", &name))
+			return name;
+	}
 
 	mutex_lock(&coresight_mutex);
 
-- 
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