linux-kernel - [PATCH v2 2/3] dt-bindings: i2c: realtek,rtl9301-i2c: extend for RTL9310 support

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Message-ID: <20250712194255.7022-3-jelonek.jonas@gmail.com>
Date: Sat, 12 Jul 2025 19:42:54 +0000
From: Jonas Jelonek <jelonek.jonas@...il.com>
To: linux-i2c@...r.kernel.org,
	Chris Packham <chris.packham@...iedtelesis.co.nz>,
	Andi Shyti <andi.shyti@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Markus Stockhausen <markus.stockhausen@....de>,
	Jonas Jelonek <jelonek.jonas@...il.com>
Subject: [PATCH v2 2/3] dt-bindings: i2c: realtek,rtl9301-i2c: extend for RTL9310 support

Add dt-bindings for RTL9310 series I2C controller.

Adjust the regex for child-node address to account for the fact that
RTL9310 supports 12 instead of only 8 SDA lines.

Add a vendor-specific property to explicitly specify the
Realtek-internal ID of the defined I2C controller/master. This is
required, in particular for RTL9310, to describe the correct I2C
master.

Add compatibles for known SoC variants RTL9311, RTL9312 and RTL9313.

Signed-off-by: Jonas Jelonek <jelonek.jonas@...il.com>
---
 .../bindings/i2c/realtek,rtl9301-i2c.yaml     | 37 +++++++++++++++++--
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml b/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml
index 69ac5db8b914..54327ca09e14 100644
--- a/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml
@@ -10,9 +10,11 @@ maintainers:
   - Chris Packham <chris.packham@...iedtelesis.co.nz>
 
 description:
-  The RTL9300 SoC has two I2C controllers. Each of these has an SCL line (which
-  if not-used for SCL can be a GPIO). There are 8 common SDA lines that can be
-  assigned to either I2C controller.
+  The RTL9300 SoCs have two I2C controllers. Each of these has an SCL line
+  (which if not-used for SCL can be a GPIO). There are 8 common SDA lines
+  that can be assigned to either I2C controller.
+  The RTL9310 SoCs have equal capabilities but support 12 common SDA lines
+  which can be assigned to either I2C controller.
 
 properties:
   compatible:
@@ -23,7 +25,14 @@ properties:
               - realtek,rtl9302c-i2c
               - realtek,rtl9303-i2c
           - const: realtek,rtl9301-i2c
+      - items:
+          - enum:
+              - realtek,rtl9311-i2c
+              - realtek,rtl9312-i2c
+              - realtek,rtl9313-i2c
+          - const: realtek,rtl9310-i2c
       - const: realtek,rtl9301-i2c
+      - const: realtek,rtl9310-i2c
 
   reg:
     items:
@@ -35,8 +44,16 @@ properties:
   "#size-cells":
     const: 0
 
+  realtek,mst-id:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    description:
+      Realtek-internal ID of the I2C controller/master. Only required
+      for RTL9310 series.
+    minimum: 1
+    maximum: 2
+
 patternProperties:
-  '^i2c@[0-7]$':
+  '^i2c@([0-9]|1[0-1])$':
     $ref: /schemas/i2c/i2c-controller.yaml
     unevaluatedProperties: false
 
@@ -68,3 +85,15 @@ examples:
         #size-cells = <0>;
       };
     };
+  - |
+    i2c@...c {
+      compatible = "realtek,rtl9310-i2c";
+      reg = <0x100c 0x18>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+      realtek,mst-id = <1>;
+
+      i2c@0 {
+        reg = <0>;
+      };
+    };
-- 
2.48.1