dt-bindings: i2c: stm32: Migrate i2c-stm32 documentation to yaml

The document was migrated to Yaml format and renamed st,stm32-i2c.yaml
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-stm32.txt

-* I2C controller embedded in STMicroelectronics STM32 I2C platform
-
-Required properties:
-- compatible: Must be one of the following
-  - "st,stm32f4-i2c"
-  - "st,stm32f7-i2c"
-- reg: Offset and length of the register set for the device
-- interrupts: Must contain the interrupt id for I2C event and then the
-  interrupt id for I2C error.
-- resets: Must contain the phandle to the reset controller.
-- clocks: Must contain the input clock of the I2C instance.
-- A pinctrl state named "default" must be defined to set pins in mode of
-  operation for I2C transfer
-- #address-cells = <1>;
-- #size-cells = <0>;
-
-Optional properties:
-- clock-frequency: Desired I2C bus clock frequency in Hz. If not specified,
-  the default 100 kHz frequency will be used.
-  For STM32F4 SoC Standard-mode and Fast-mode are supported, possible values are
-  100000 and 400000.
-  For STM32F7, STM32H7 and STM32MP1 SoCs, Standard-mode, Fast-mode and Fast-mode
-  Plus are supported, possible values are 100000, 400000 and 1000000.
-- dmas: List of phandles to rx and tx DMA channels. Refer to stm32-dma.txt.
-- dma-names: List of dma names. Valid names are: "rx" and "tx".
-- i2c-scl-rising-time-ns: I2C SCL Rising time for the board (default: 25)
-  For STM32F7, STM32H7 and STM32MP1 only.
-- i2c-scl-falling-time-ns: I2C SCL Falling time for the board (default: 10)
-  For STM32F7, STM32H7 and STM32MP1 only.
-  I2C Timings are derived from these 2 values
-- st,syscfg-fmp: Use to set Fast Mode Plus bit within SYSCFG when Fast Mode
-  Plus speed is selected by slave.
-	1st cell: phandle to syscfg
-	2nd cell: register offset within SYSCFG
-	3rd cell: register bitmask for FMP bit
-  For STM32F7, STM32H7 and STM32MP1 only.
-
-Example:
-
-	i2c@40005400 {
-		compatible = "st,stm32f4-i2c";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		reg = <0x40005400 0x400>;
-		interrupts = <31>,
-			     <32>;
-		resets = <&rcc 277>;
-		clocks = <&rcc 0 149>;
-		pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;
-		pinctrl-names = "default";
-	};
-
-	i2c@40005400 {
-		compatible = "st,stm32f7-i2c";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		reg = <0x40005400 0x400>;
-		interrupts = <31>,
-			     <32>;
-		resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
-		clocks = <&rcc 1 CLK_I2C1>;
-		pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;
-		pinctrl-names = "default";
-		st,syscfg-fmp = <&syscfg 0x4 0x1>;
-	};

Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/st,stm32-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: I2C controller embedded in STMicroelectronics STM32 I2C platform
+
+maintainers:
+  - Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - st,stm32f7-i2c
+    then:
+      properties:
+        i2c-scl-rising-time-ns:
+          default: 25
+
+        i2c-scl-falling-time-ns:
+          default: 10
+
+        st,syscfg-fmp:
+          description: Use to set Fast Mode Plus bit within SYSCFG when
+                       Fast Mode Plus speed is selected by slave.
+                       Format is phandle to syscfg / register offset within
+                       syscfg / register bitmask for FMP bit.
+          allOf:
+            - $ref: "/schemas/types.yaml#/definitions/phandle-array"
+            - items:
+                minItems: 3
+                maxItems: 3
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - st,stm32f4-i2c
+    then:
+      properties:
+        clock-frequency:
+          enum: [100000, 400000]
+
+properties:
+  compatible:
+    enum:
+      - st,stm32f4-i2c
+      - st,stm32f7-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: interrupt ID for I2C event
+      - description: interrupt ID for I2C error
+
+  resets:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  dmas:
+    items:
+      - description: RX DMA Channel phandle
+      - description: TX DMA Channel phandle
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+  clock-frequency:
+    description: Desired I2C bus clock frequency in Hz. If not specified,
+                 the default 100 kHz frequency will be used.
+                 For STM32F7, STM32H7 and STM32MP1 SoCs, Standard-mode,
+                 Fast-mode and Fast-mode Plus are supported, possible
+                 values are 100000, 400000 and 1000000.
+    default: 100000
+    enum: [100000, 400000, 1000000]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - resets
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/mfd/stm32f7-rcc.h>
+    #include <dt-bindings/clock/stm32fx-clock.h>
+    //Example 1 (with st,stm32f4-i2c compatible)
+      i2c@40005400 {
+          compatible = "st,stm32f4-i2c";
+          #address-cells = <1>;
+          #size-cells = <0>;
+          reg = <0x40005400 0x400>;
+          interrupts = <31>,
+                       <32>;
+          resets = <&rcc 277>;
+          clocks = <&rcc 0 149>;
+      };
+
+    //Example 2 (with st,stm32f7-i2c compatible)
+      i2c@40005800 {
+          compatible = "st,stm32f7-i2c";
+          #address-cells = <1>;
+          #size-cells = <0>;
+          reg = <0x40005800 0x400>;
+          interrupts = <31>,
+                       <32>;
+          resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
+          clocks = <&rcc 1 CLK_I2C1>;
+      };
+
+    //Example 3 (with st,stm32f7-i2c compatible on stm32mp)
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    #include <dt-bindings/reset/stm32mp1-resets.h>
+      i2c@40013000 {
+          compatible = "st,stm32f7-i2c";
+          #address-cells = <1>;
+          #size-cells = <0>;
+          reg = <0x40013000 0x400>;
+          interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
+                       <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
+          clocks = <&rcc I2C2_K>;
+          resets = <&rcc I2C2_R>;
+          i2c-scl-rising-time-ns = <185>;
+          i2c-scl-falling-time-ns = <20>;
+          st,syscfg-fmp = <&syscfg 0x4 0x2>;
+      };
+...