linux-kernel - [PATCH v1 01/13] dt-bindings: power: mediatek: Document mediatek,bus-protection

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Message-ID: <20250623120154.109429-2-angelogioacchino.delregno@collabora.com>
Date: Mon, 23 Jun 2025 14:01:42 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: linux-mediatek@...ts.infradead.org
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	ulf.hansson@...aro.org,
	y.oudjana@...tonmail.com,
	fshao@...omium.org,
	wenst@...omium.org,
	lihongbo22@...wei.com,
	mandyjh.liu@...iatek.com,
	mbrugger@...e.com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-pm@...r.kernel.org,
	kernel@...labora.com
Subject: [PATCH v1 01/13] dt-bindings: power: mediatek: Document mediatek,bus-protection

Add a new mediatek,bus-protection property in the main power
controller node and deprecate the old mediatek,infracfg,
mediatek,infracfg-nao and mediatek,smi properties located in
the children.

This is done in order to both simplify the power controller
nodes and in preparation for adding support for new generation
SoCs like MT8196/MT6991 and other variants, which will need
to set protection on new busses.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 .../power/mediatek,power-controller.yaml      | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml b/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
index 9c7cc632abee..2530c873bb3c 100644
--- a/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
+++ b/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
@@ -44,6 +44,18 @@ properties:
   '#size-cells':
     const: 0
 
+  mediatek,bus-protection:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      A number of phandles to external blocks to set and clear the required
+      bits to enable or disable bus protection, necessary to avoid any bus
+      faults while enabling or disabling a power domain.
+      For example, this may hold phandles to INFRACFG and SMI.
+    minItems: 1
+    maxItems: 3
+    items:
+      maxItems: 1
+
 patternProperties:
   "^power-domain@[0-9a-f]+$":
     $ref: "#/$defs/power-domain-node"
@@ -123,14 +135,17 @@ $defs:
       mediatek,infracfg:
         $ref: /schemas/types.yaml#/definitions/phandle
         description: phandle to the device containing the INFRACFG register range.
+        deprecated: true
 
       mediatek,infracfg-nao:
         $ref: /schemas/types.yaml#/definitions/phandle
         description: phandle to the device containing the INFRACFG-NAO register range.
+        deprecated: true
 
       mediatek,smi:
         $ref: /schemas/types.yaml#/definitions/phandle
         description: phandle to the device containing the SMI register range.
+        deprecated: true
 
     required:
       - reg
@@ -138,6 +153,31 @@ $defs:
 required:
   - compatible
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt8183-power-controller
+    then:
+      properties:
+        mediatek,bus-protection:
+          minItems: 2
+          maxItems: 2
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt8365-power-controller
+    then:
+      properties:
+        mediatek,bus-protection:
+          minItems: 3
+          maxItems: 3
+
 additionalProperties: false
 
 examples:
-- 
2.49.0