linux-kernel - [RFC 07/18] remoteproc: Add component bind/unbind for virtio platform

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Date:   Thu, 16 Apr 2020 18:13:20 +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 07/18] remoteproc: Add component bind/unbind for virtio platform

Add component to declare bind and unbind functions. Theses functions
are used to ensure that the remoteproc virtio device is probed
and registered as a subdev of the rproc device before rproc
request the the prepare and start of the subdevice.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
---
 drivers/remoteproc/remoteproc_virtio.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 2a0f33ccd929..e1d7371d2d64 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -10,6 +10,7 @@
  * Brian Swetland <swetland@...gle.com>
  */
 
+#include <linux/component.h>
 #include <linux/dma-mapping.h>
 #include <linux/export.h>
 #include <linux/module.h>
@@ -426,7 +427,8 @@ static const struct rproc_subdev rproc_virtio_subdev = {
 	.stop		= rproc_vitio_stop
 };
 
-static int rproc_virtio_bind(struct device *dev)
+static int rproc_virtio_bind(struct device *dev, struct device *master,
+			     void *data)
 {
 	struct rproc_vdev *rvdev = dev_get_drvdata(dev);
 	struct rproc *rproc = rvdev->rproc;
@@ -483,7 +485,8 @@ static int rproc_virtio_bind(struct device *dev)
 	return ret;
 }
 
-static void rproc_virtio_unbind(struct device *dev)
+static void rproc_virtio_unbind(struct device *dev, struct device *master,
+				void *data)
 {
 	struct rproc_vdev *rvdev = dev_get_drvdata(dev);
 	struct rproc *rproc = rvdev->rproc;
@@ -504,6 +507,11 @@ static void rproc_virtio_unbind(struct device *dev)
 	dev_dbg(dev, "virtio dev %d unbound\n",  rvdev->index);
 }
 
+static const struct component_ops rproc_virtio_ops = {
+	.bind = rproc_virtio_bind,
+	.unbind = rproc_virtio_unbind,
+};
+
 static int rproc_virtio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -548,14 +556,21 @@ static int rproc_virtio_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, rvdev);
 
+	ret = component_add(&pdev->dev, &rproc_virtio_ops);
+	if (ret)
+		return ret;
+
 	rproc_register_rvdev(rproc, rvdev);
 
-	return rproc_virtio_bind(dev);
+	return 0;
 }
 
 static int rproc_virtio_remove(struct platform_device *pdev)
 {
-	rproc_virtio_unbind(&pdev->dev);
+	struct rproc_vdev *rvdev = dev_get_drvdata(&pdev->dev);
+
+	component_del(&pdev->dev, &rproc_virtio_ops);
+	rproc_unregister_rvdev(rvdev);
 
 	return 0;
 }
-- 
2.17.1