linux-kernel - [PATCH RFC 1/2] dt-bindings: arm: Document reboot mode magic

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Message-ID: <20231030-arm-psci-system_reset2-vendor-reboots-v1-1-dcdd63352ad1@quicinc.com>
Date:   Mon, 30 Oct 2023 14:31:33 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Mark Rutland <mark.rutland@....com>
CC:     Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Elliot Berman <quic_eberman@...cinc.com>
Subject: [PATCH RFC 1/2] 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: Elliot Berman <quic_eberman@...cinc.com>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index 0c5381e081bd..dc23e901bd0a 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -122,6 +122,19 @@ patternProperties:
       [3] Documentation/devicetree/bindings/power/power-domain.yaml
       [4] Documentation/devicetree/bindings/power/domain-idle-state.yaml
 
+  "^reboot-mode-.*$":
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    description: |
+      Describes a vendor-specific reset type. The string after "reboot-mode-"
+      maps a reboot mode to the parameters in the PSCI SYSTEM_RESET2 call.
+
+      Parameters are named reboot-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.
+
 required:
   - compatible
   - method

-- 
2.41.0