[PATCH v10 04/10] dt-bindings: arm: Document reboot mode magic

[Shivendra Pratap <shivendra.pratap@xxxxxxxxxxxxxxxx>]

From: Elliot Berman <elliot.berman@xxxxxxxxxxxxxxxx>

Add bindings to describe vendor-specific reboot modes. Values here
correspond to valid parameters to vendor-specific reset types in PSCI
SYSTEM_RESET2 call.

Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>
Signed-off-by: Elliot Berman <elliot.berman@xxxxxxxxxxxxxxxx>
Signed-off-by: Shivendra Pratap <shivendra.pratap@xxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 41 +++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index 7360a2849b5bd1e4cbadac533c1a7228573288d4..672fc28f69ed7cfed4baf8c2185e0cd7b2024376 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -98,6 +98,25 @@ properties:
       [1] Kernel documentation - ARM idle states bindings
         Documentation/devicetree/bindings/cpu/idle-states.yaml
 
+  reset-types:
+    type: object
+    $ref: /schemas/power/reset/reboot-mode.yaml#
+    unevaluatedProperties: false
+    properties:
+      # "mode-normal" is just SYSTEM_RESET
+      mode-normal: false
+    patternProperties:
+      "^mode-.*$":
+        minItems: 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. Both reset_type and cookie must be specified.
+          The 31st bit (vendor-resets) will be implicitly set by the driver.
+
 patternProperties:
   "^power-domain-":
     $ref: /schemas/power/power-domain.yaml#
@@ -137,6 +156,15 @@ allOf:
       required:
         - cpu_off
         - cpu_on
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: arm,psci-1.0
+    then:
+      properties:
+        reset-types: false
 
 additionalProperties: false
 
@@ -261,4 +289,17 @@ examples:
         domain-idle-states = <&cluster_ret>, <&cluster_pwrdn>;
       };
     };
+
+  - |+
+
+    // Case 5: SYSTEM_RESET2 vendor resets
+    psci {
+      compatible = "arm,psci-1.0";
+      method = "smc";
+
+      reset-types {
+        mode-edl = <0 0>;
+        mode-bootloader = <1 2>;
+      };
+    };
 ...

-- 
2.34.1