[PATCH v24 05/12] dt-bindings: arm: Document reboot mode magic

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: Shivendra Pratap <[email protected]>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 58 +++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index 6e2e0c551841..7d6a86690a2e 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -98,6 +98,41 @@ properties:
       [1] Kernel documentation - ARM idle states bindings
         Documentation/devicetree/bindings/cpu/idle-states.yaml
 
+  reboot-mode:
+    type: object
+    $ref: /schemas/power/reset/reboot-mode.yaml#
+    unevaluatedProperties: false
+    properties:
+      # "mode-normal" is just SYSTEM_RESET
+      mode-normal: false
+    patternProperties:
+      "^mode-.*$":
+        minItems: 1
+        maxItems: 3
+        items:
+          - description: arg1 (vendor-specific SYSTEM_RESET2 reset_type)
+            allOf:
+              - $ref: /schemas/types.yaml#/definitions/uint32
+              - minimum: 0x80000000
+          - description: arg2 (cookie_lo in 2-cell form, cookie_hi in 3-cell form)
+            $ref: /schemas/types.yaml#/definitions/uint32
+          - description: arg3 (cookie_lo in 3-cell form)
+            $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          Describes a PSCI SYSTEM_RESET2 vendor-specific reset type. The string
+          after "mode-" maps a reboot mode to a vendor-specific reset.
+          A vendor-specific reset takes two arguments, a 32-bit reset_type and a
+          64-bit cookie. The arguments are encoded as up to three 32-bit cells.
+          Each mode property is encoded as mode-xxx = <arg1[, arg2[, arg3]]>,
+          where:
+          - arg1 is reset_type and must be >= 0x80000000.
+          - In 2-cell form, arg2 is lower 32 bits of cookie.
+          - In 3-cell form, arg2 is high 32 bits of cookie
+            and arg3 is low 32 bits of cookie.
+
+          All values should be provided as per the PSCI SYSTEM_RESET2
+          specification.
+
 patternProperties:
   "^power-domain-":
     $ref: /schemas/power/power-domain.yaml#
@@ -137,6 +172,15 @@ allOf:
       required:
         - cpu_off
         - cpu_on
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: arm,psci-1.0
+    then:
+      properties:
+        reboot-mode: false
 
 additionalProperties: false
 
@@ -260,4 +304,18 @@ examples:
         domain-idle-states = <&cluster_ret>, <&cluster_pwrdn>;
       };
     };
+
+  - |+
+
+    // Case 5: SYSTEM_RESET2 vendor resets
+    psci {
+      compatible = "arm,psci-1.0";
+      method = "smc";
+
+      reboot-mode {
+        mode-edl = <0x80000000 0x00000001>;
+        mode-bootloader = <0x80010001 0x00000002>;
+        mode-vendor = <0x80000000 0x00000001 0x00000002>;
+      };
+    };
 ...

-- 
2.34.1