linux-kernel - [PATCH v10 04/10] dt-bindings: arm: Document reboot mode magic

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Message-Id: <20250710-arm-psci-system_reset2-vendor-reboots-v10-4-b2d3b882be85@oss.qualcomm.com>
Date: Thu, 10 Jul 2025 14:45:46 +0530
From: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
To: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Andy Yan <andy.yan@...k-chips.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, Vinod Koul <vkoul@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Elliot Berman <elliotb317@...il.com>
Cc: Stephen Boyd <swboyd@...omium.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        Andre Draszik <andre.draszik@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-samsung-soc@...r.kernel.org, Wei Xu <xuwei5@...ilicon.com>,
        linux-rockchip@...ts.infradead.org,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Sen Chu <sen.chu@...iatek.com>, Sean Wang <sean.wang@...iatek.com>,
        Macpaul Lin <macpaul.lin@...iatek.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Shivendra Pratap <shivendra.pratap@....qualcomm.com>,
        Srinivas Kandagatla <srini@...nel.org>,
        Elliot Berman <elliot.berman@....qualcomm.com>
Subject: [PATCH v10 04/10] dt-bindings: arm: Document reboot mode magic

From: Elliot Berman <elliot.berman@....qualcomm.com>

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 <elliot.berman@....qualcomm.com>
Signed-off-by: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 41 +++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index 7360a2849b5bd1e4cbadac533c1a7228573288d4..672fc28f69ed7cfed4baf8c2185e0cd7b2024376 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -98,6 +98,25 @@ 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: 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. Both reset_type and cookie must be specified.
+          The 31st bit (vendor-resets) will be implicitly set by the driver.
+
 patternProperties:
   "^power-domain-":
     $ref: /schemas/power/power-domain.yaml#
@@ -137,6 +156,15 @@ 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 +289,17 @@ 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 0>;
+        mode-bootloader = <1 2>;
+      };
+    };
 ...

-- 
2.34.1