linux-kernel - [PATCH v6 2/5] dt-bindings: arm: Document reboot mode magic

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Message-ID: <20241018-arm-psci-system_reset2-vendor-reboots-v6-2-50cbe88b0a24@quicinc.com>
Date: Fri, 18 Oct 2024 12:39:47 -0700
From: Elliot Berman <quic_eberman@...cinc.com>
To: Bjorn Andersson <andersson@...nel.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>,
        Arnd Bergmann
	<arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Catalin Marinas
	<catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, <cros-qcom-dts-watchers@...omium.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.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 v6 2/5] 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.

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 43 +++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index cbb012e217ab..5e07c62fe5d7 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -98,6 +98,27 @@ 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: 1
+        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.
+
 patternProperties:
   "^power-domain-":
     $ref: /schemas/power/power-domain.yaml#
@@ -137,6 +158,15 @@ 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 +291,17 @@ 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