[PATCH v2 1/8] dt-bindings: arm: Add Live Firmware Activation binding

[Andre Przywara <andre.przywara@arm.com>]

The Arm Live Firmware Activation spec [1] describes updating firmware
images during runtime, without requiring a reboot. Update images might
be deployed out-of-band, for instance via a BMC, in this case the OS
needs to be notified about the availability of a new image.

This binding describes an interrupt that could be triggered by the
platform, to notify about any changes.

[1] https://developer.arm.com/documentation/den0147/latest/

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 .../devicetree/bindings/arm/arm,lfa.yaml      | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/arm,lfa.yaml

diff --git a/Documentation/devicetree/bindings/arm/arm,lfa.yaml b/Documentation/devicetree/bindings/arm/arm,lfa.yaml
new file mode 100644
index 000000000000..92f0564fd672
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/arm,lfa.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/arm,lfa.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm Live Firmware Activation (LFA)
+
+maintainers:
+  - Andre Przywara <andre.przywara@arm.com>
+  - Sudeep Holla <sudeep.holla@arm.com>
+
+description:
+  The Arm Live Firmware Activation (LFA) specification [1] describes a
+  firmware interface to activate an updated firmware at runtime, without
+  requiring a reboot. Updates might be supplied out-of-band, for instance
+  via a BMC, in which case the platform needs to notify an OS about pending
+  image updates.
+  [1] https://developer.arm.com/documentation/den0147/latest/
+
+properties:
+  compatible:
+    const: arm,lfa
+
+  interrupts:
+    maxItems: 1
+    description: notification interrupt for changed firmware image status
+
+required:
+  - compatible
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    firmware {
+        arm-lfa {
+            compatible = "arm,lfa";
+            interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
+...
-- 
2.43.0