[7.0_bos] NVIDIA: VR: SAUCE: firmware: smccc: Add Live Firmware Activation (LFA) v2 support

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>;
+        };
+    };
+...

drivers/firmware/smccc/Kconfig

@@ -26,8 +26,10 @@ config ARM_SMCCC_SOC_ID
 
 config ARM_LFA
 	tristate "Arm Live Firmware activation support"
-	depends on HAVE_ARM_SMCCC_DISCOVERY
+	depends on HAVE_ARM_SMCCC_DISCOVERY && ARM64
 	default y
 	help
-	  Include support for triggering Live Firmware Activation, which
-	  allows to upgrade certain firmware components without a reboot.
+	  Include support for triggering a Live Firmware Activation (LFA),
+	  which allows to upgrade certain firmware components without a reboot.
+	  This is described in the Arm DEN0147 specification, and relies on
+	  a firmware agent running in EL3.