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From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     ohad@wizery.com, bjorn.andersson@linaro.org,
        arnaud.pouliquen@st.com
Cc:     robh+dt@kernel.org, mcoquelin.stm32@gmail.com,
        alexandre.torgue@st.com, linux-remoteproc@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 01/19] dt-bindings: remoteproc: Add bindind to support autonomous processors
Date:   Thu, 11 Feb 2021 16:46:09 -0700
Message-Id: <20210211234627.2669674-2-mathieu.poirier@linaro.org>
In-Reply-To: <20210211234627.2669674-1-mathieu.poirier@linaro.org>
References: <20210211234627.2669674-1-mathieu.poirier@linaro.org>
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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@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/remoteproc/remoteproc-core.yaml  | 27 +++++++++++++++++++
 1 file changed, 27 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..e8bb8ef9031a
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/remoteproc-core.yaml
@@ -0,0 +1,27 @@
+# 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(s) for a primary processor applicable to all ancillary
+       processors
+
+maintainers:
+  - Bjorn Andersson <bjorn.andersson@linaro.org>
+  - Mathieu Poirier <mathieu.poirier@linaro.org>
+
+description:
+  This document defines the bindings used by a primary processor to determine
+  the state it should leave an ancillary processor when the former is no longer
+  functioning.
+
+properties:
+  autonomous-on-core-reboot:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      When specified the ancillary processor should be left operational when
+      the primary processor is no longer available.  Otherwise the ancillary
+      processor should be made inoperative.
+
+additionalProperties: true
-- 
2.25.1