linux-kernel - [PATCH v20 1/4] dt-bindings: i2c: Split AST2600 binding into a new YAML

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Message-ID: <20251021013548.2375190-2-ryan_chen@aspeedtech.com>
Date: Tue, 21 Oct 2025 09:35:45 +0800
From: Ryan Chen <ryan_chen@...eedtech.com>
To: <ryan_chen@...eedtech.com>, <benh@...nel.crashing.org>, <joel@....id.au>,
	<andi.shyti@...nel.org>, <jk@...econstruct.com.au>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <andrew@...econstruct.com.au>,
	<p.zabel@...gutronix.de>, <andriy.shevchenko@...ux.intel.com>,
	<naresh.solanki@...ements.com>, <linux-i2c@...r.kernel.org>,
	<openbmc@...ts.ozlabs.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-aspeed@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v20 1/4] dt-bindings: i2c: Split AST2600 binding into a new YAML

The AST2600 I2C controller is a new hardware design compared to the
I2C controllers in previous ASPEED SoCs (e.g., AST2400, AST2500).

It introduces new features such as:
 - A redesigned register layout
 - Separation between controller and target mode registers
 - Transfer mode selection (byte, buffer, DMA)
 - Support for a shared global register block for configuration

Due to these fundamental differences, maintaining a separate
devicetree binding file for AST2600 helps to clearly distinguish
the hardware capabilities and configuration options from the older
controllers.

Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com>
---
 .../devicetree/bindings/i2c/aspeed,i2c.yaml   |  3 +-
 .../devicetree/bindings/i2c/ast2600-i2c.yaml  | 66 +++++++++++++++++++
 2 files changed, 67 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/i2c/ast2600-i2c.yaml

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
index 5b9bd2feda3b..d4e4f412feba 100644
--- a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/i2c/aspeed,i2c.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs
+title: ASPEED I2C on the AST24XX, AST25XX SoCs
 
 maintainers:
   - Rayn Chen <rayn_chen@...eedtech.com>
@@ -17,7 +17,6 @@ properties:
     enum:
       - aspeed,ast2400-i2c-bus
       - aspeed,ast2500-i2c-bus
-      - aspeed,ast2600-i2c-bus
 
   reg:
     minItems: 1
diff --git a/Documentation/devicetree/bindings/i2c/ast2600-i2c.yaml b/Documentation/devicetree/bindings/i2c/ast2600-i2c.yaml
new file mode 100644
index 000000000000..6ddcec5decdc
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/ast2600-i2c.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/ast2600-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED I2C on the AST26XX SoCs
+
+maintainers:
+  - Ryan Chen <ryan_chen@...eedtech.com>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2600-i2c-bus
+
+  reg:
+    minItems: 1
+    items:
+      - description: address offset and range of bus
+      - description: address offset and range of bus buffer
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    description:
+      root clock of bus, should reference the APB
+      clock in the second cell
+
+  resets:
+    maxItems: 1
+
+  bus-frequency:
+    minimum: 500
+    maximum: 4000000
+    default: 100000
+    description: frequency of the bus clock in Hz defaults to 100 kHz when not
+      specified
+
+required:
+  - reg
+  - compatible
+  - clocks
+  - resets
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/aspeed-clock.h>
+    i2c@40 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      compatible = "aspeed,ast2600-i2c-bus";
+      reg = <0x40 0x40>;
+      clocks = <&syscon ASPEED_CLK_APB>;
+      resets = <&syscon ASPEED_RESET_I2C>;
+      bus-frequency = <100000>;
+      interrupts = <0>;
+      interrupt-parent = <&i2c_ic>;
+    };
-- 
2.34.1