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From:   Ryan Chen <ryan_chen@aspeedtech.com>
To:     Brendan Higgins <brendan.higgins@linux.dev>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Joel Stanley <joel@jms.id.au>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
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        Philipp Zabel <p.zabel@pengutronix.de>,
        Wolfram Sang <wsa@kernel.org>,
        "Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
        <linux-i2c@vger.kernel.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Jean Delvare <jdelvare@suse.de>,
        William Zhang <william.zhang@broadcom.com>,
        Tyrone Ting <kfting@nuvoton.com>,
        Tharun Kumar P <tharunkumar.pasumarthi@microchip.com>,
        Ryan Chen <ryan_chen@aspeedtech.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        "Phil Edworthy" <phil.edworthy@renesas.com>,
        <openbmc@lists.ozlabs.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
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Subject: [PATCH v9 1/2 RESEND] dt-bindings: i2c: aspeed: support for AST2600-i2cv2
Date:   Thu, 13 Apr 2023 15:53:26 +0800
Message-ID: <20230413075327.1397306-2-ryan_chen@aspeedtech.com>
In-Reply-To: <20230413075327.1397306-1-ryan_chen@aspeedtech.com>
References: <20230413075327.1397306-1-ryan_chen@aspeedtech.com>
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Add ast2600-i2cv2 compatible and aspeed,global-regs, aspeed,enable-dma
and description for ast2600-i2cv2.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
---
 .../devicetree/bindings/i2c/aspeed,i2c.yaml   | 52 +++++++++++++++++--
 1 file changed, 49 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
index f597f73ccd87..de252f6817ee 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 Device Tree Bindings
 maintainers:
   - Rayn Chen <rayn_chen@aspeedtech.com>
 
-allOf:
-  - $ref: /schemas/i2c/i2c-controller.yaml#
-
 properties:
   compatible:
     enum:
@@ -49,6 +46,25 @@ 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
@@ -57,6 +73,26 @@ required:
 
 unevaluatedProperties: false
 
+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
+
+
 examples:
   - |
     #include <dt-bindings/clock/aspeed-clock.h>
@@ -71,3 +107,13 @@ 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