linux-kernel - [PATCH 1/2] dt-bindings: i2c-new: Add bindings for AST2600 i2C new controller

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Message-ID: <20220323004009.943298-2-ryan_chen@aspeedtech.com>
Date:   Wed, 23 Mar 2022 08:40:08 +0800
From:   ryan_chen <ryan_chen@...eedtech.com>
To:     <BMC-SW@...eedtech.com>, Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
CC:     Ryan Chen <ryan_chen@...eedtech.com>
Subject: [PATCH 1/2] dt-bindings: i2c-new: Add bindings for AST2600 i2C new controller

AST2600 support new register set for I2C controller, add bindings document
to support driver of i2c new controller

Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com>
---
 .../bindings/i2c/aspeed,i2c-new.yaml          | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/aspeed,i2c-new.yaml

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c-new.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c-new.yaml
new file mode 100644
index 000000000000..2e49c5438ad2
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c-new.yaml
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/aspeed,i2c-new.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED New I2C Controller on the AST26XX SoCs Device Tree Bindings
+
+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: 2000000
+    default: 100000
+    description: frequency of the bus clock in Hz defaults to 100 kHz when not
+      specified
+
+  multi-master:
+    type: boolean
+    description:
+      states that there is another master active on this bus
+
+required:
+  - reg
+  - compatible
+  - clocks
+  - resets
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/ast2600-clock.h>
+
+    i2c_gr: i2c-global-regs@0 {
+      compatible = "aspeed,ast2600-i2c-global", "syscon";
+      reg = <0x0 0x20>;
+      resets = <&syscon ASPEED_RESET_I2C>;
+    };
+
+    i2c0: i2c-bus@80 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      #interrupt-cells = <1>;
+      compatible = "aspeed,ast2600-i2c-bus";
+      reg = <0x80 0x80>, <0xC00 0x20>;
+      clocks = <&syscon ASPEED_CLK_APB2>;
+      resets = <&syscon ASPEED_RESET_I2C>;
+      bus-frequency = <100000>;
+    };
-- 
2.25.1