dt-bindings: clock: convert rockchip,px30-cru.txt to YAML

Convert rockchip,px30-cru.txt to YAML.

Changes against original bindings:
  Use compatible string: "rockchip,px30-pmucru"

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220330103923.11063-1-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/clock/rockchip,px30-cru.txt

@@ -1,70 +0,0 @@
-* Rockchip PX30 Clock and Reset Unit
-
-The PX30 clock controller generates and supplies clock to various
-controllers within the SoC and also implements a reset controller for SoC
-peripherals.
-
-Required Properties:
-
-- compatible: PMU for CRU should be "rockchip,px30-pmu-cru"
-- compatible: CRU should be "rockchip,px30-cru"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- clocks: A list of phandle + clock-specifier pairs for the clocks listed
-          in clock-names
-- clock-names: Should contain the following:
-  - "xin24m" for both PMUCRU and CRU
-  - "gpll" for CRU (sourced from PMUCRU)
-- #clock-cells: should be 1.
-- #reset-cells: should be 1.
-
-Optional Properties:
-
-- rockchip,grf: phandle to the syscon managing the "general register files"
-  If missing, pll rates are not changeable, due to the missing pll lock status.
-
-Each clock is assigned an identifier and client nodes can use this identifier
-to specify the clock which they consume. All available clocks are defined as
-preprocessor macros in the dt-bindings/clock/px30-cru.h headers and can be
-used in device tree sources. Similar macros exist for the reset sources in
-these files.
-
-External clocks:
-
-There are several clocks that are generated outside the SoC. It is expected
-that they are defined using standard clock bindings with following
-clock-output-names:
- - "xin24m" - crystal input - required,
- - "xin32k" - rtc clock - optional,
- - "i2sx_clkin" - external I2S clock - optional,
- - "gmac_clkin" - external GMAC clock - optional
-
-Example: Clock controller node:
-
-	pmucru: clock-controller@ff2bc000 {
-		compatible = "rockchip,px30-pmucru";
-		reg = <0x0 0xff2bc000 0x0 0x1000>;
-		#clock-cells = <1>;
-		#reset-cells = <1>;
-	};
-
-	cru: clock-controller@ff2b0000 {
-		compatible = "rockchip,px30-cru";
-		reg = <0x0 0xff2b0000 0x0 0x1000>;
-		rockchip,grf = <&grf>;
-		#clock-cells = <1>;
-		#reset-cells = <1>;
-	};
-
-Example: UART controller node that consumes the clock generated by the clock
-  controller:
-
-	uart0: serial@ff030000 {
-		compatible = "rockchip,px30-uart", "snps,dw-apb-uart";
-		reg = <0x0 0xff030000 0x0 0x100>;
-		interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&pmucru SCLK_UART0_PMU>, <&pmucru PCLK_UART0_PMU>;
-		clock-names = "baudclk", "apb_pclk";
-		reg-shift = <2>;
-		reg-io-width = <4>;
-	};

Documentation/devicetree/bindings/clock/rockchip,px30-cru.yaml

@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/rockchip,px30-cru.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip PX30 Clock and Reset Unit (CRU)
+
+maintainers:
+  - Elaine Zhang <zhangqing@rock-chips.com>
+  - Heiko Stuebner <heiko@sntech.de>
+
+description: |
+  The PX30 clock controller generates and supplies clocks to various
+  controllers within the SoC and also implements a reset controller for SoC
+  peripherals.
+  Each clock is assigned an identifier and client nodes can use this identifier
+  to specify the clock which they consume. All available clocks are defined as
+  preprocessor macros in the dt-bindings/clock/px30-cru.h headers and can be
+  used in device tree sources. Similar macros exist for the reset sources in
+  these files.
+  There are several clocks that are generated outside the SoC. It is expected
+  that they are defined using standard clock bindings with following
+  clock-output-names:
+    - "xin24m"     - crystal input       - required
+    - "xin32k"     - rtc clock           - optional
+    - "i2sx_clkin" - external I2S clock  - optional
+    - "gmac_clkin" - external GMAC clock - optional
+
+properties:
+  compatible:
+    enum:
+      - rockchip,px30-cru
+      - rockchip,px30-pmucru
+
+  reg:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 1
+
+  "#reset-cells":
+    const: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: Clock for both PMUCRU and CRU
+      - description: Clock for CRU (sourced from PMUCRU)
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: xin24m
+      - const: gpll
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon managing the "general register files" (GRF),
+      if missing pll rates are not changeable, due to the missing pll
+      lock status.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#clock-cells"
+  - "#reset-cells"
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: rockchip,px30-cru
+
+    then:
+      properties:
+        clocks:
+          minItems: 2
+
+        clock-names:
+          minItems: 2
+
+    else:
+      properties:
+        clocks:
+          maxItems: 1
+
+        clock-names:
+          maxItems: 1
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/px30-cru.h>
+
+    pmucru: clock-controller@ff2bc000 {
+      compatible = "rockchip,px30-pmucru";
+      reg = <0xff2bc000 0x1000>;
+      clocks = <&xin24m>;
+      clock-names = "xin24m";
+      rockchip,grf = <&grf>;
+      #clock-cells = <1>;
+      #reset-cells = <1>;
+    };
+
+    cru: clock-controller@ff2b0000 {
+      compatible = "rockchip,px30-cru";
+      reg = <0xff2b0000 0x1000>;
+      clocks = <&xin24m>, <&pmucru PLL_GPLL>;
+      clock-names = "xin24m", "gpll";
+      rockchip,grf = <&grf>;
+      #clock-cells = <1>;
+      #reset-cells = <1>;
+    };