dt-bindings: i2c: i2c-st: convert to DT schema

Convert i2c-st.txt into st,sti-i2c.yaml for the i2c-st driver.
Signed-off-by: Alain Volmat <avolmat@me.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

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

-ST SSC binding, for I2C mode operation
-
-Required properties :
-- compatible : Must be "st,comms-ssc-i2c" or "st,comms-ssc4-i2c"
-- reg : Offset and length of the register set for the device
-- interrupts : the interrupt specifier
-- clock-names: Must contain "ssc".
-- clocks: Must contain an entry for each name in clock-names. See the common
-  clock bindings.
-- A pinctrl state named "default" must be defined to set pins in mode of
-  operation for I2C transfer.
-
-Optional properties :
-- clock-frequency : Desired I2C bus clock frequency in Hz. If not specified,
-  the default 100 kHz frequency will be used. As only Normal and Fast modes
-  are supported, possible values are 100000 and 400000.
-- st,i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is
-  allowed through the deglitch circuit. In units of us.
-- st,i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is
-  allowed through the deglitch circuit. In units of us.
-- A pinctrl state named "idle" could be defined to set pins in idle state
-  when I2C instance is not performing a transfer.
-- A pinctrl state named "sleep" could be defined to set pins in sleep state
-  when driver enters in suspend.
-
-
-
-Example :
-
-i2c0: i2c@fed40000 {
-	compatible	= "st,comms-ssc4-i2c";
-	reg		= <0xfed40000 0x110>;
-	interrupts	=  <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>;
-	clocks		= <&clk_s_a0_ls CLK_ICN_REG>;
-	clock-names	= "ssc";
-	clock-frequency = <400000>;
-	pinctrl-names	= "default";
-	pinctrl-0	= <&pinctrl_i2c0_default>;
-	st,i2c-min-scl-pulse-width-us = <0>;
-	st,i2c-min-sda-pulse-width-us = <5>;
-};

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

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/st,sti-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: I2C controller embedded in STMicroelectronics STi platform
+
+maintainers:
+  - Patrice Chotard <patrice.chotard@foss.st.com>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - st,comms-ssc-i2c
+      - st,comms-ssc4-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    maxItems: 1
+
+  clock-frequency:
+    enum: [ 100000, 400000 ]
+    default: 100000
+
+  st,i2c-min-scl-pulse-width-us:
+    description:
+      The minimum valid SCL pulse width that is allowed through the
+      deglitch circuit. In units of us.
+
+  st,i2c-min-sda-pulse-width-us:
+    description:
+      The minimum valid SDA pulse width that is allowed through the
+      deglitch circuit. In units of us.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stih407-clks.h>
+    i2c@fed40000 {
+        compatible = "st,comms-ssc4-i2c";
+        reg = <0xfed40000 0x110>;
+        interrupts =  <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk_s_a0_ls CLK_ICN_REG>;
+        clock-names = "ssc";
+        clock-frequency = <400000>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_i2c0_default>;
+        st,i2c-min-scl-pulse-width-us = <0>;
+        st,i2c-min-sda-pulse-width-us = <5>;
+    };

MAINTAINERS

@@ -2925,7 +2925,7 @@ M:	Patrice Chotard <patrice.chotard@foss.st.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 W:	http://www.stlinux.com
-F:	Documentation/devicetree/bindings/i2c/i2c-st.txt
+F:	Documentation/devicetree/bindings/i2c/st,sti-i2c.yaml
 F:	arch/arm/boot/dts/sti*
 F:	arch/arm/mach-sti/
 F:	drivers/ata/ahci_st.c