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[v2,2/4] dt-bindings: arm: Document reboot mode magic

Message ID 20240414-arm-psci-system_reset2-vendor-reboots-v2-2-da9a055a648f@quicinc.com
State Superseded
Headers show
Series Implement vendor resets for PSCI SYSTEM_RESET2 | expand

Commit Message

Elliot Berman April 14, 2024, 7:30 p.m. UTC 
Add bindings to describe vendor-specific reboot modes. Values here
correspond to valid parameters to vendor-specific reset types in PSCI
SYSTEM_RESET2 call.

Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 38 +++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)
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Patch

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index cbb012e217ab..ac778274b3ac 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -137,8 +137,31 @@  allOf:
       required:
         - cpu_off
         - cpu_on
-
-additionalProperties: false
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: arm,psci-1.0
+    then:
+      allOf:
+        - $ref: /schemas/power/reset/reboot-mode.yaml#
+        - properties:
+            # "mode-normal" is just SYSTEM_RESET
+            mode-normal: false
+        - patternProperties:
+            "^mode-.*$":
+              items:
+                maxItems: 2
+              description: |
+                Describes a vendor-specific reset type. The string after "mode-"
+                maps a reboot mode to the parameters in the PSCI SYSTEM_RESET2 call.
+
+                Parameters are named mode-xxx = <type[, cookie]>, where xxx
+                is the name of the magic reboot mode, type is the lower 31 bits
+                of the reset_type, and, optionally, the cookie value. If the cookie
+                is not provided, it is defaulted to zero.
+
+unevaluatedProperties: false
 
 examples:
   - |+
@@ -261,4 +284,15 @@  examples:
         domain-idle-states = <&CLUSTER_RET>, <&CLUSTER_PWRDN>;
       };
     };
+
+  - |+
+
+    // Case 5: SYSTEM_RESET2 vendor resets
+    psci {
+      compatible = "arm,psci-1.0";
+      method = "smc";
+
+      mode-edl = <0>;
+      mode-bootloader = <1 2>;
+    };
 ...