linux-kernel - [PATCH V3 2/3] dt-bindings: tegra: pmc: Update scratch as an optional aperture

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Message-ID: <20240211171727.914595-2-petlozup@nvidia.com>
Date: Sun, 11 Feb 2024 17:17:26 +0000
From: Petlozu Pravareshwar <petlozup@...dia.com>
To: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<p.zabel@...gutronix.de>, <dmitry.osipenko@...labora.com>,
	<ulf.hansson@...aro.org>, <kkartik@...dia.com>, <cai.huoqing@...ux.dev>,
	<spatra@...dia.com>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <petlozup@...dia.com>
Subject: [PATCH V3 2/3] dt-bindings: tegra: pmc: Update scratch as an optional aperture

Scratch address space register is used to store reboot reason. For
some Tegra234 systems, the scratch space is not available to store
the reboot reason. This is because scratch region on these systems
is not accessible by the kernel as restricted by the Hypervisor.
Such systems would delist scratch aperture from PMC DT node.

Accordingly, this change makes "scratch" as an optional aperture for
Tegra234 in PMC dt-binding document.

Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
---
Changes in v3:
- Update 'reg-names' property items as per the review comments.

 .../arm/tegra/nvidia,tegra186-pmc.yaml        | 58 ++++++++++++-------
 1 file changed, 38 insertions(+), 20 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.yaml b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.yaml
index 0faa403f68c8..ea4fbf655220 100644
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.yaml
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.yaml
@@ -27,7 +27,7 @@ properties:
       - const: pmc
       - const: wake
       - const: aotag
-      - const: scratch
+      - enum: [ scratch, misc ]
       - const: misc
 
   interrupt-controller: true
@@ -41,25 +41,43 @@ properties:
     description: If present, inverts the PMU interrupt signal.
     $ref: /schemas/types.yaml#/definitions/flag
 
-if:
-  properties:
-    compatible:
-      contains:
-        const: nvidia,tegra186-pmc
-then:
-  properties:
-    reg:
-      maxItems: 4
-
-    reg-names:
-      maxItems: 4
-else:
-  properties:
-    reg:
-      minItems: 5
-
-    reg-names:
-      minItems: 5
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra186-pmc
+    then:
+      properties:
+        reg:
+          maxItems: 4
+        reg-names:
+          maxItems: 4
+          contains:
+            const: scratch
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra194-pmc
+    then:
+      properties:
+        reg:
+          minItems: 5
+        reg-names:
+          minItems: 5
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra234-pmc
+    then:
+      properties:
+        reg-names:
+          contains:
+            const: misc
 
 patternProperties:
   "^[a-z0-9]+-[a-z0-9]+$":
-- 
2.34.1