linux-kernel - [PATCH v2 2/2] dt-bindings: aspeed-i2c: add properties for manual clock setting

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Message-Id: <20220601041512.21484-3-potin.lai.pt@gmail.com>
Date:   Wed,  1 Jun 2022 12:15:12 +0800
From:   Potin Lai <potin.lai.pt@...il.com>
To:     Brendan Higgins <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Rob Herring <robh+dt@...nel.org>,
        Rayn Chen <rayn_chen@...eedtech.com>
Cc:     Patrick Williams <patrick@...cx.xyz>,
        Potin Lai <potin.lai@...ntatw.com>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Potin Lai <potin.lai.pt@...il.com>
Subject: [PATCH v2 2/2] dt-bindings: aspeed-i2c: add properties for manual clock setting

Add following properties for manual tuning clock divisor and cycle of
hign/low pulse witdh.

* aspeed,i2c-manual-clk: Enable aspeed i2c clock manual setting
* aspeed,i2c-base-clk-div: Base Clock divisor (tBaseClk)
* aspeed,i2c-clk-high-cycle: Cycles of clock-high pulse (tClkHigh)
* aspeed,i2c-clk-low-cycle: Cycles of clock-low pulse (tClkLow)

Signed-off-by: Potin Lai <potin.lai.pt@...il.com>
---
 .../devicetree/bindings/i2c/aspeed,i2c.yaml   | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
index ea643e6c3ef5..e2f67fe2aa0c 100644
--- a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
@@ -12,6 +12,28 @@ maintainers:
 allOf:
   - $ref: /schemas/i2c/i2c-controller.yaml#
 
+  - if:
+      properties:
+        compatible:
+          const: st,stm32-uart
+
+    then:
+      properties:
+        aspeed,i2c-clk-high-cycle:
+          maximum: 8
+        aspeed,i2c-clk-low-cycle:
+          maximum: 8
+
+  - if:
+      required:
+        - aspeed,i2c-manual-clk
+
+    then:
+      required:
+        - aspeed,i2c-base-clk-div
+        - aspeed,i2c-clk-high-cycle
+        - aspeed,i2c-clk-low-cycle
+
 properties:
   compatible:
     enum:
@@ -49,6 +71,28 @@ properties:
     description:
       states that there is another master active on this bus
 
+  aspeed,i2c-manual-clk:
+    type: boolean
+    description: enable manual clock setting
+
+  aspeed,i2c-base-clk-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192,
+           16384, 32768]
+    description: base clock divisor
+
+  aspeed,i2c-clk-high-cycle:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 16
+    description: cycles of master clock-high pulse width
+
+  aspeed,i2c-clk-low-cycle:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 16
+    description: cycles of master clock-low pulse width
+
 required:
   - reg
   - compatible
-- 
2.17.1