linux-kernel - [PATCH 1/3] dt-bindings: soc: Add VIA/WonderMedia SoC identification

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Message-Id: <20250423-wmt-soc-driver-v1-1-bd8bf32521c2@gmail.com>
Date: Wed, 23 Apr 2025 23:18:31 +0400
From: Alexey Charkov <alchark@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, Alexey Charkov <alchark@...il.com>
Subject: [PATCH 1/3] dt-bindings: soc: Add VIA/WonderMedia SoC
 identification

VIA/WonderMedia SoC's have a chip ID register inside their system
configuration controller space, which can be used to identify
appropriate hardware quirks at runtime. Add binding for it.

Signed-off-by: Alexey Charkov <alchark@...il.com>
---
 .../devicetree/bindings/soc/vt8500/via,scc-id.yaml | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/vt8500/via,scc-id.yaml b/Documentation/devicetree/bindings/soc/vt8500/via,scc-id.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..eac72bd66fd6331c8d9316288bc1acc3e337efaa
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/vt8500/via,scc-id.yaml
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/vt8500/via,scc-id.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: VIA/WonderMedia SoC system configuration information
+
+maintainers:
+  - Alexey Charkov <alchark@...il.com>
+
+description:
+  The system configuration controller on VIA/WonderMedia SoC's contains a chip
+  identifier and revision used to differentiate between different hardware
+  versions of on-chip IP blocks having their own peculiarities which may or
+  may not be captured by their respective DT compatible strings
+
+properties:
+  compatible:
+    items:
+      - const: via,scc-id
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    system-configuration@...20000 {
+        compatible = "via,scc-id";
+        reg = <0xd8120000 0x4>;
+    };

-- 
2.49.0