[RFC v2 13/14] remoteproc: Add automation flags

[Mathieu Poirier <mathieu.poirier@linaro.org>]

Adding flags to dictate how to handle a platform driver being removed
or the remote processor crashing while in RPROC_ATTACHED state.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/remoteproc/remoteproc_core.c | 25 +++++++++++++++++++++++++
 include/linux/remoteproc.h           |  5 +++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 229fa2cad0bd..d024367c63e5 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2227,6 +2227,29 @@ static int rproc_alloc_ops(struct rproc *rproc, const struct rproc_ops *ops)
 	return 0;
 }
 
+static void rproc_set_automation_flags(struct rproc *rproc)
+{
+	struct device *dev = rproc->dev.parent;
+	struct device_node *np = dev->of_node;
+	bool core_reboot, remote_crash;
+
+	/*
+	 * When function rproc_cdev_release() or rproc_del() are called and
+	 * the remote processor has been attached to, it will be detached from
+	 * (rather than turned off) if "autonomous_on_core_reboot" is specified
+	 * in the DT.
+	 */
+	core_reboot = of_property_read_bool(np, "autonomous_on_core_reboot");
+	rproc->autonomous_on_core_reboot = core_reboot;
+
+	/*
+	 * When the remote processor crashes it will be detached from, and
+	 * attached to, if "autonomous_on_remote_crash" is specified in the DT.
+	 */
+	remote_crash = of_property_read_bool(np, "autonomous_on_remote_crash");
+	rproc->autonomous_on_core_reboot = core_reboot;
+}
+
 /**
  * rproc_alloc() - allocate a remote processor handle
  * @dev: the underlying device
@@ -2285,6 +2308,8 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 	if (rproc_alloc_ops(rproc, ops))
 		goto put_device;
 
+	rproc_set_automation_flags(rproc);
+
 	/* Assign a unique device index and name */
 	rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
 	if (rproc->index < 0) {
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 71d4d4873164..9a6e79ef35d7 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -516,6 +516,9 @@ struct rproc_dump_segment {
  * @nb_vdev: number of vdev currently handled by rproc
  * @char_dev: character device of the rproc
  * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
+ * @autonomous_on_core_reboot: true if the remote processor should be detached from
+ *			       (rather than turned off) when the remoteproc core
+ *			       goes away.
  */
 struct rproc {
 	struct list_head node;
@@ -554,6 +557,8 @@ struct rproc {
 	u16 elf_machine;
 	struct cdev cdev;
 	bool cdev_put_on_release;
+	bool autonomous_on_core_reboot	: 1,
+	     autonomous_on_remote_crash	: 1;
 };
 
 /**
-- 
2.25.1