linux-kernel - [PATCH v3 2/4] dt-bindings: arm: Document reboot mode magic

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Message-ID: <20240515-arm-psci-system_reset2-vendor-reboots-v3-2-16dd4f9c0ab4@quicinc.com>
Date: Wed, 15 May 2024 16:09:45 -0700
From: Elliot Berman <quic_eberman@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Sebastian Reichel <sre@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Andy Yan
	<andy.yan@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "Mark
 Rutland" <mark.rutland@....com>,
        Bartosz Golaszewski
	<bartosz.golaszewski@...aro.org>
CC: Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Melody Olvera
	<quic_molvera@...cinc.com>,
        Shivendra Pratap <quic_spratap@...cinc.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Florian Fainelli
	<florian.fainelli@...adcom.com>,
        <linux-pm@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        Elliot Berman <quic_eberman@...cinc.com>
Subject: [PATCH v3 2/4] 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 | 43 +++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index cbb012e217ab..47b5bbe540ce 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -137,8 +137,34 @@ allOf:
       required:
         - cpu_off
         - cpu_on
-
-additionalProperties: false
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: arm,psci-1.0
+    then:
+      properties:
+        reset-types:
+          type: object
+          $ref: /schemas/power/reset/reboot-mode.yaml#
+          properties:
+            # "mode-normal" is just SYSTEM_RESET
+            mode-normal: false
+          patternProperties:
+            "^mode-.*$":
+              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.
+                The 31st bit (vendor-resets) will be implicitly set by the driver.
+
+unevaluatedProperties: false
 
 examples:
   - |+
@@ -261,4 +287,17 @@ 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>;
+        mode-bootloader = <1 2>;
+      };
+    };
 ...

-- 
2.34.1