linux-kernel - [PATCH v22 1/4] dt-bindings: i2c: Split AST2600 binding into a new YAML

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Message-ID: <20251112085649.1903631-2-ryan_chen@aspeedtech.com>
Date: Wed, 12 Nov 2025 16:56:46 +0800
From: Ryan Chen <ryan_chen@...eedtech.com>
To: <ryan_chen@...eedtech.com>, <bmc-sw@...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 v22 1/4] dt-bindings: i2c: Split AST2600 binding into a new YAML

The AST2600 I2C controller introduces a completely new register
map and Separate control/target register sets, unlike the mixed
layout used in AST2400/AST2500.

In addition, at new AST2600 configuration registers and transfer
modes require new DT properties, which are incompatible with
existing bindings. Therefore, this creates a dedicated binding
file for AST2600 to properly describe these new hardware
capabilities.

A subsequent change will modify this new binding to properly
describe the AST2600 hardware.

The example section updated to reflect the actual AST2600 SoC
register layout and interrupt configuration.
Reference: aspeed-g6.dtsi (lines 885-897)

-I2C bus and buffeset address offsets
 - AST2600 I2C controller register base starts from 0x80, and the
   buffer region is located at 0xc00, as defined in AST2600 SOC
   register map.

-Interrupt configuration
 - AST2600 U2C controller are connected to ARM GIC interrupt
   controller rather than the legacy internal interrupt controller.

Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com>
---
 .../bindings/i2c/aspeed,ast2600-i2c.yaml      | 67 +++++++++++++++++++
 .../devicetree/bindings/i2c/aspeed,i2c.yaml   |  3 +-
 2 files changed, 68 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml
new file mode 100644
index 000000000000..e6ed84c53639
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/aspeed,ast2600-i2c.yaml#
+$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
+    maxItems: 2
+    description:
+      The first region covers the controller registers.
+      The optional second region covers the controller's buffer space.
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    description:
+      root clock of bus, should reference the APB
+      clock in the second cell
+
+  clock-frequency:
+    description: Desired operating frequency of the I2C bus in Hz.
+    minimum: 500
+    maximum: 4000000
+    default: 100000
+
+  resets:
+    maxItems: 1
+
+required:
+  - reg
+  - compatible
+  - clocks
+  - resets
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/aspeed-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    i2c@80 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      compatible = "aspeed,ast2600-i2c-bus";
+      reg = <0x80 0x80>, <0xc00 0x20>;
+      clocks = <&syscon ASPEED_CLK_APB>;
+      resets = <&syscon ASPEED_RESET_I2C>;
+      clock-frequency = <100000>;
+      interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+    };
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
-- 
2.34.1