linux-kernel - [PATCH v2 2/2] dt-bindings: arm: keystone: add boot

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Message-ID: <20251112-k3_syscon_add_boot_mailboxes-v2-2-aebc1e47b391@ti.com>
Date: Wed, 12 Nov 2025 14:00:54 +0530
From: Anshul Dalal <anshuld@...com>
To: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>, "Santosh
 Shilimkar" <ssantosh@...nel.org>, Rob Herring <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Vignesh Raghavendra <vigneshr@...com>,
	"Anshul Dalal" <anshuld@...com>
Subject: [PATCH v2 2/2] dt-bindings: arm: keystone: add boot_* mboxes to
 ti,sci

The bootloader on K3 devices makes use of mailboxes as per the ROM spec
which might be different than one's available to the kernel (firmware
spec).

Therefore, this patch adds the missing mailbox entries to the DT binding
to represent the mailboxes exposed by the hardware during boot for the
purpose of loading the firmware.

Signed-off-by: Anshul Dalal <anshuld@...com>
---
 .../devicetree/bindings/arm/keystone/ti,sci.yaml     | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
index 182915c34fc1429fb627ac44c99c0c76fdf28e0f..770d6bc7c8f83493e448c426cb8f785dd73e824d 100644
--- a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
+++ b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
@@ -51,12 +51,17 @@ properties:
     minItems: 1
 
   mbox-names:
+    minItems: 2
     description: |
       Specifies the mailboxes used to communicate with TI-SCI Controller
       made available from TI-SCI controller.
     items:
       - const: rx
       - const: tx
+      - const: notify
+      - const: boot_rx
+      - const: boot_tx
+      - const: boot_notify
 
   mboxes:
     minItems: 2
@@ -66,6 +71,10 @@ properties:
     items:
       - description: RX thread
       - description: TX thread
+      - description: Notify thread
+      - description: boot stage RX thread
+      - description: boot stage TX thread
+      - description: boot stage Notify thread
 
   ti,host-id:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -128,3 +137,14 @@ examples:
         #reset-cells = <2>;
       };
     };
+
+  - |
+    sms: system-controller@...83000 {
+      compatible = "ti,am654-sci";
+      mbox-names = "rx", "tx", "notify", "boot_rx", "boot_tx", "boot_notify";
+      mboxes = <&secure_proxy_mcu 8>, <&secure_proxy_mcu 6>,
+        <&secure_proxy_mcu 5>, <&secure_proxy_mcu 4>,
+        <&secure_proxy_mcu 5>, <&secure_proxy_sa3 5>;
+      reg-names = "debug_messages";
+      reg = <0x44083000 0x1000>;
+    };

-- 
2.51.0