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From: Siddharth Gupta <sidgup@codeaurora.org>
To: agross@kernel.org, bjorn.andersson@linaro.org, ohad@wizery.com,
	corbet@lwn.net
Cc: Siddharth Gupta <sidgup@codeaurora.org>,
	linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, tsoni@codeaurora.org,
	psodagud@codeaurora.org, rishabhb@codeaurora.org,
	linux-doc@vger.kernel.org
Subject: [PATCH v5 2/2] remoteproc: core: Register the character device interface
Date: Wed, 29 Jul 2020 10:40:01 -0700
Message-ID: <1596044401-22083-3-git-send-email-sidgup@codeaurora.org> (raw)
In-Reply-To: <1596044401-22083-1-git-send-email-sidgup@codeaurora.org>

Add the character device during rproc_add. This would create
a character device node at /dev/remoteproc<index>. Userspace
applications can interact with the remote processor using this
interface.

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

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 277d3bf..7f90eee 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1986,6 +1986,11 @@ int rproc_add(struct rproc *rproc)
 	/* create debugfs entries */
 	rproc_create_debug_dir(rproc);
 
+	/* add char device for this remoteproc */
+	ret = rproc_char_device_add(rproc);
+	if (ret < 0)
+		return ret;
+
 	/*
 	 * Remind ourselves the remote processor has been attached to rather
 	 * than booted by the remoteproc core.  This is important because the
@@ -2262,6 +2267,7 @@ int rproc_del(struct rproc *rproc)
 	mutex_unlock(&rproc->lock);
 
 	rproc_delete_debug_dir(rproc);
+	rproc_char_device_remove(rproc);
 
 	/* the rproc is downref'ed as soon as it's removed from the klist */
 	mutex_lock(&rproc_list_mutex);
@@ -2430,6 +2436,7 @@ static int __init remoteproc_init(void)
 {
 	rproc_init_sysfs();
 	rproc_init_debugfs();
+	rproc_init_cdev();
 	rproc_init_panic();
 
 	return 0;
-- 
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29 17:39 [PATCH v5 0/2] Add character device interface to remoteproc Siddharth Gupta
2020-07-29 17:40 ` [PATCH v5 1/2] remoteproc: Add remoteproc character device interface Siddharth Gupta
2020-07-29 19:16   ` Bjorn Andersson
2020-07-30 17:06   ` Mathieu Poirier
2020-07-29 17:40 ` Siddharth Gupta [this message]
2020-07-29 19:16   ` [PATCH v5 2/2] remoteproc: core: Register the " Bjorn Andersson
2020-07-30 17:07   ` Mathieu Poirier

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