linux-kernel - [RFC PATCH v2 5/6] remoteproc: virtio: Add helper to create platform device

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Date:   Wed, 22 Dec 2021 09:23:48 +0100
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        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@...s.st.com>
Subject: [RFC PATCH v2 5/6] remoteproc: virtio: Add helper to create platform device

Add capability to create platform device for the rproc virtio.
This is a step to move forward the management of the rproc virtio
as an independent device.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/remoteproc/remoteproc_internal.h |  3 ++
 drivers/remoteproc/remoteproc_virtio.c   | 36 ++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 6f511c50a15d..3007d29a26e1 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -37,6 +37,9 @@ int rproc_of_parse_firmware(struct device *dev, int index,
 
 /* from remoteproc_virtio.c */
 int rproc_rvdev_add_device(struct rproc_vdev *rvdev);
+struct platform_device *
+rproc_virtio_register_device(struct rproc *rproc, struct rproc_vdev_pdata *vdev_data);
+void rproc_virtio_unregister_device(struct rproc_vdev *rvdev);
 irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
 void rproc_vdev_release(struct kref *ref);
 
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 5f8005caeb6e..5eef679cc520 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -578,6 +578,42 @@ void rproc_vdev_release(struct kref *ref)
 	rproc_rvdev_remove_device(rvdev);
 }
 
+/**
+ * rproc_virtio_register_device() - register a remoteproc virtio device
+ * @rproc: rproc handle to add the remoteproc virtio device to
+ * @vdev_data: platform device data
+ *
+ * Return: 0 on success, and an appropriate error value otherwise
+ */
+struct platform_device *
+rproc_virtio_register_device(struct rproc *rproc, struct rproc_vdev_pdata *vdev_data)
+{
+	struct device *dev = &rproc->dev;
+	struct platform_device *pdev;
+
+	pdev = platform_device_register_data(dev, "rproc-virtio", vdev_data->index, vdev_data,
+					     sizeof(*vdev_data));
+	if (PTR_ERR_OR_ZERO(pdev)) {
+		dev_err(rproc->dev.parent,
+			"failed to create rproc-virtio device\n");
+	}
+
+	return  pdev;
+}
+EXPORT_SYMBOL(rproc_virtio_register_device);
+
+/**
+ * rproc_virtio_unregister_device() - unregister a remoteproc virtio device
+ * @rvdev: remote proc virtio handle to unregister
+ *
+ */
+void rproc_virtio_unregister_device(struct rproc_vdev *rvdev)
+{
+	if (rvdev->pdev)
+		platform_device_unregister(rvdev->pdev);
+}
+EXPORT_SYMBOL(rproc_virtio_unregister_device);
+
 static int rproc_virtio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-- 
2.17.1