linux-kernel - [PATCH v3 01/15] dt-bindings: remoteproc: Add bindind to support autonomous processors

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Date:   Thu, 26 Nov 2020 14:06:28 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org, robh+dt@...nel.org
Cc:     linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, arnaud.pouliquen@...com
Subject: [PATCH v3 01/15] dt-bindings: remoteproc: Add bindind to support autonomous processors

This patch adds a binding to guide the remoteproc core on how to deal with
remote processors in two cases:

1) When an application holding a reference to a remote processor character
   device interface crashes.

2) when the platform driver for a remote processor is removed.

In both cases if "autonomous-on-core-reboot" is specified in the remote
processor DT node, the remoteproc core will detach the remote processor
rather than switching it off.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 .../bindings/remoteproc/remoteproc-core.yaml  | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/remoteproc-core.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/remoteproc-core.yaml b/Documentation/devicetree/bindings/remoteproc/remoteproc-core.yaml
new file mode 100644
index 000000000000..3032734f42a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/remoteproc-core.yaml
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/remoteproc/remoteproc-core.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Binding for the remoteproc core applicable to all remote processors
+
+maintainers:
+  - Bjorn Andersson <bjorn.andersson@...aro.org>
+  - Mathieu Poirier <mathieu.poirier@...aro.org>
+
+description:
+  This document defines the binding recognised by the remoteproc core that can
+  be used by any remote processor in the subsystem.
+
+properties:
+  autonomous-on-core-reboot:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Used in two situations, i.e when a user space application releases the
+      handle it has on the remote processor's character driver interface and
+      when a remote processor's platform driver is being removed.  If defined,
+      this flag instructs the remoteproc core to detach the remote processor
+      rather than turning it off.
-- 
2.25.1