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

Elliot Berman
2024-04-14T19:32:04Z

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(-)

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>;
+ };
...

--
2.34.1