linux-kernel - [PATCH v14 1/3] dt-bindings: i2c: aspeed: support for AST2600-i2cv2

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Message-ID: <20241002070213.1165263-2-ryan_chen@aspeedtech.com>
Date: Wed, 2 Oct 2024 15:02:11 +0800
From: Ryan Chen <ryan_chen@...eedtech.com>
To: <brendan.higgins@...ux.dev>, <benh@...nel.crashing.org>, <joel@....id.au>,
	<andi.shyti@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <andrew@...econstruct.com.au>,
	<p.zabel@...gutronix.de>, <andriy.shevchenko@...ux.intel.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>,
	<ryan_chen@...eedtech.com>
CC: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v14 1/3] dt-bindings: i2c: aspeed: support for AST2600-i2cv2

Add ast2600-i2cv2 compatible and aspeed,global-regs, aspeed,enable-dma
and description for ast2600-i2cv2.

Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 .../devicetree/bindings/i2c/aspeed,i2c.yaml   | 51 +++++++++++++++++--
 1 file changed, 48 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
index 6df27b47b922..6c16fc76c978 100644
--- a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
@@ -9,9 +9,6 @@ title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs
 maintainers:
   - Rayn Chen <rayn_chen@...eedtech.com>
 
-allOf:
-  - $ref: /schemas/i2c/i2c-controller.yaml#
-
 properties:
   compatible:
     enum:
@@ -49,12 +46,50 @@ properties:
     description:
       states that there is another master active on this bus
 
+  aspeed,enable-dma:
+    type: boolean
+    description: |
+      I2C bus enable dma mode transfer.
+
+      ASPEED ast2600 platform equipped with 16 I2C controllers that share a
+      single DMA engine. DTS files can specify the data transfer mode to/from
+      the device, either DMA or programmed I/O. However, hardware limitations
+      may require a DTS to manually allocate which controller can use DMA mode.
+      The "aspeed,enable-dma" property allows control of this.
+
+      In cases where one the hardware design results in a specific
+      controller handling a larger amount of data, a DTS would likely
+      enable DMA mode for that one controller.
+
+  aspeed,global-regs:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: The phandle of i2c global register node.
+
 required:
   - reg
   - compatible
   - clocks
   - resets
 
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: aspeed,ast2600-i2cv2
+
+    then:
+      properties:
+        reg:
+          minItems: 2
+      required:
+        - aspeed,global-regs
+    else:
+      properties:
+        aspeed,global-regs: false
+        aspeed,enable-dma: false
+
 unevaluatedProperties: false
 
 examples:
@@ -71,3 +106,13 @@ examples:
       interrupts = <0>;
       interrupt-parent = <&i2c_ic>;
     };
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    i2c1: i2c@80 {
+      compatible = "aspeed,ast2600-i2cv2";
+      reg = <0x80 0x80>, <0xc00 0x20>;
+      aspeed,global-regs = <&i2c_global>;
+      clocks = <&syscon ASPEED_CLK_APB>;
+      resets = <&syscon ASPEED_RESET_I2C>;
+      interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+    };
-- 
2.34.1