linux-kernel - [PATCH 2/2] remoteproc: core: Register the character device interface

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Date:   Fri, 20 Mar 2020 16:36:17 -0700
From:   Rishabh Bhatnagar <rishabhb@...eaurora.org>
To:     linux-remoteproc-owner@...r.kernel.org,
        linux-kernel@...r.kernel.org, bjorn.andersson@...aro.org,
        mathieu.poirier@...aro.org
Cc:     psodagud@...eaurora.org, tsoni@...eaurora.org,
        sidgup@...eaurora.org, Rishabh Bhatnagar <rishabhb@...eaurora.org>
Subject: [PATCH 2/2] remoteproc: core: Register the character device interface

Add the character device during rproc_add. This would create
a character device node at /dev/subsys_<rproc_name>. Userspace
applications can interact with the remote processor using this
interface rather than using sysfs node. To distinguish between
different remote processor nodes the device name has been changed
to include the rproc name appended to "subsys_" string.

Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
---
 drivers/remoteproc/remoteproc_core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 097f33e..48a3932 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1907,6 +1907,12 @@ int rproc_add(struct rproc *rproc)
 	struct device *dev = &rproc->dev;
 	int ret;
 
+	ret = rproc_char_device_add(rproc);
+	if (ret) {
+		pr_err("error while adding character device\n");
+		return ret;
+	}
+
 	ret = device_add(dev);
 	if (ret < 0)
 		return ret;
@@ -2044,7 +2050,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 		return NULL;
 	}
 
-	dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);
+	dev_set_name(&rproc->dev, "subsys_%s", rproc->name);
 
 	atomic_set(&rproc->power, 0);
 
-- 
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