linux-kernel - [RFC 10/18] remoteproc: Add capability to populate rproc subnode devices

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Message-ID: <20200416161331.7606-11-arnaud.pouliquen@st.com>
Date:   Thu, 16 Apr 2020 18:13:23 +0200
From:   Arnaud Pouliquen <arnaud.pouliquen@...com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <arnaud.pouliquen@...com>
Subject: [RFC 10/18] remoteproc: Add capability to populate rproc subnode devices

Add the capability to add rproc sub nodes in device tree.
Devices declared as rproc sub node will be probed
before the remote firmware boot sequence.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
---
 drivers/remoteproc/remoteproc_core.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index c9e07c53ed0c..75f84fd3bd60 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1605,6 +1605,26 @@ static void rproc_crash_handler_work(struct work_struct *work)
 		rproc_trigger_recovery(rproc);
 }
 
+static int rproc_platform_populate(struct rproc *rproc)
+{
+	struct device *dev = rproc->dev.parent;
+	int ret;
+
+	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
+	if (ret < 0) {
+		dev_err(dev, "failed to populate child devices (%d)\n", ret);
+
+		goto depopulate;
+	}
+
+	return 0;
+
+depopulate:
+	of_platform_depopulate(dev);
+
+	return ret;
+}
+
 /**
  * rproc_boot() - boot a remote processor
  * @rproc: handle of a remote processor
@@ -1629,6 +1649,10 @@ int rproc_boot(struct rproc *rproc)
 
 	dev = &rproc->dev;
 
+	ret = rproc_platform_populate(rproc);
+	if (ret)
+		return ret;
+
 	ret = mutex_lock_interruptible(&rproc->lock);
 	if (ret) {
 		dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
@@ -1735,6 +1759,7 @@ void rproc_shutdown(struct rproc *rproc)
 	rproc->table_ptr = NULL;
 out:
 	mutex_unlock(&rproc->lock);
+	of_platform_depopulate(rproc->dev.parent);
 }
 EXPORT_SYMBOL(rproc_shutdown);
 
-- 
2.17.1