dt-bindings: i2c: convert rockchip i2c bindings to yaml

Current dts files with 'i2c' nodes are manually verified.
In order to automate this process i2c-rk3x.txt
has to be converted to yaml. In the new setup
i2c-rk3x.yaml will inherit properties from
i2c-controller.yaml.

Also change document name in MAINTAINERS.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-rk3x.txt

-* Rockchip RK3xxx I2C controller
-
-This driver interfaces with the native I2C controller present in Rockchip
-RK3xxx SoCs.
-
-Required properties :
-
- - reg : Offset and length of the register set for the device
- - compatible: should be one of the following:
-   - "rockchip,rv1108-i2c": for rv1108
-   - "rockchip,rk3066-i2c": for rk3066
-   - "rockchip,rk3188-i2c": for rk3188
-   - "rockchip,rk3228-i2c": for rk3228
-   - "rockchip,rk3288-i2c": for rk3288
-   - "rockchip,rk3328-i2c", "rockchip,rk3399-i2c": for rk3328
-   - "rockchip,rk3399-i2c": for rk3399
- - interrupts : interrupt number
- - clocks: See ../clock/clock-bindings.txt
-   - For older hardware (rk3066, rk3188, rk3228, rk3288):
-     - There is one clock that's used both to derive the functional clock
-       for the device and as the bus clock.
-   - For newer hardware (rk3399): specified by name
-     - "i2c": This is used to derive the functional clock.
-     - "pclk": This is the bus clock.
-
-Required on RK3066, RK3188 :
-
- - rockchip,grf : the phandle of the syscon node for the general register
-		  file (GRF)
- - on those SoCs an alias with the correct I2C bus ID (bit offset in the GRF)
-   is also required.
-
-Optional properties :
-
- - clock-frequency : SCL frequency to use (in Hz). If omitted, 100kHz is used.
- - i2c-scl-rising-time-ns : Number of nanoseconds the SCL signal takes to rise
-	(t(r) in I2C specification). If not specified this is assumed to be
-	the maximum the specification allows(1000 ns for Standard-mode,
-	300 ns for Fast-mode) which might cause slightly slower communication.
- - i2c-scl-falling-time-ns : Number of nanoseconds the SCL signal takes to fall
-	(t(f) in the I2C specification). If not specified this is assumed to
-	be the maximum the specification allows (300 ns) which might cause
-	slightly slower communication.
- - i2c-sda-falling-time-ns : Number of nanoseconds the SDA signal takes to fall
-	(t(f) in the I2C specification). If not specified we'll use the SCL
-	value since they are the same in nearly all cases.
-
-Example:
-
-aliases {
-	i2c0 = &i2c0;
-}
-
-i2c0: i2c@2002d000 {
-	compatible = "rockchip,rk3188-i2c";
-	reg = <0x2002d000 0x1000>;
-	interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
-	#address-cells = <1>;
-	#size-cells = <0>;
-
-	rockchip,grf = <&grf>;
-
-	clock-names = "i2c";
-	clocks = <&cru PCLK_I2C0>;
-
-	i2c-scl-rising-time-ns = <800>;
-	i2c-scl-falling-time-ns = <100>;
-};

Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-rk3x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip RK3xxx I2C controller
+
+description:
+  This driver interfaces with the native I2C controller present in Rockchip
+  RK3xxx SoCs.
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+
+# Everything else is described in the common file
+properties:
+  compatible:
+    oneOf:
+      - const: rockchip,rv1108-i2c
+      - const: rockchip,rk3066-i2c
+      - const: rockchip,rk3188-i2c
+      - const: rockchip,rk3228-i2c
+      - const: rockchip,rk3288-i2c
+      - const: rockchip,rk3399-i2c
+      - items:
+          - enum:
+            - rockchip,rk3328-i2c
+          - const: rockchip,rk3399-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description:
+          For older hardware (rk3066, rk3188, rk3228, rk3288)
+          there is one clock that is used both to derive the functional clock
+          for the device and as the bus clock.
+          For newer hardware (rk3399) this clock is used to derive
+          the functional clock
+      - description:
+          For newer hardware (rk3399) this is the bus clock
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: i2c
+      - const: pclk
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Required on RK3066, RK3188 the phandle of the syscon node for
+      the general register file (GRF)
+      On those SoCs an alias with the correct I2C bus ID
+      (bit offset in the GRF) is also required.
+
+  clock-frequency:
+    default: 100000
+    description:
+      SCL frequency to use (in Hz). If omitted, 100kHz is used.
+
+  i2c-scl-rising-time-ns:
+    default: 1000
+    description:
+      Number of nanoseconds the SCL signal takes to rise
+      (t(r) in I2C specification). If not specified this is assumed to be
+      the maximum the specification allows(1000 ns for Standard-mode,
+      300 ns for Fast-mode) which might cause slightly slower communication.
+
+  i2c-scl-falling-time-ns:
+    default: 300
+    description:
+      Number of nanoseconds the SCL signal takes to fall
+      (t(f) in the I2C specification). If not specified this is assumed to
+      be the maximum the specification allows (300 ns) which might cause
+      slightly slower communication.
+
+  i2c-sda-falling-time-ns:
+    default: 300
+    description:
+      Number of nanoseconds the SDA signal takes to fall
+      (t(f) in the I2C specification). If not specified we will use the SCL
+      value since they are the same in nearly all cases.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - rockchip,rk3066-i2c
+          - rockchip,rk3188-i2c
+
+then:
+  required:
+    - rockchip,grf
+
+examples:
+  - |
+    #include <dt-bindings/clock/rk3188-cru-common.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c0: i2c@2002d000 {
+      compatible = "rockchip,rk3188-i2c";
+      reg = <0x2002d000 0x1000>;
+      interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&cru PCLK_I2C0>;
+      clock-names = "i2c";
+      rockchip,grf = <&grf>;
+      i2c-scl-falling-time-ns = <100>;
+      i2c-scl-rising-time-ns = <800>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };

MAINTAINERS

@@ -2274,7 +2274,7 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-rockchip@lists.infradead.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git
 S:	Maintained
-F:	Documentation/devicetree/bindings/i2c/i2c-rk3x.txt
+F:	Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml
 F:	Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.yaml
 F:	arch/arm/boot/dts/rk3*
 F:	arch/arm/boot/dts/rv1108*