dt-bindings: clock: ti: Convert gate.txt to json-schema

Convert the OMAP gate clock device tree binding to json-schema.
Specify the creator of the original binding as a maintainer.
Choose GPL-only license because original binding was also GPL.
Clean up the examples during conversion to meet modern standards and
remove examples with no additional value.
Due to usage in code and existing devicetree binding, add the
ti,set-rate-parent property.

Signed-off-by: Andreas Kemnade <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/ti/gate.txt

···
-Binding for Texas Instruments gate clock.
-
-This binding uses the common clock binding[1]. This clock is
-quite much similar to the basic gate-clock [2], however,
-it supports a number of additional features. If no register
-is provided for this clock, the code assumes that a clockdomain
-will be controlled instead and the corresponding hw-ops for
-that is used.
-
-[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-[2] Documentation/devicetree/bindings/clock/gpio-gate-clock.yaml
-[3] Documentation/devicetree/bindings/clock/ti/clockdomain.txt
-
-Required properties:
-- compatible : shall be one of:
-  "ti,gate-clock" - basic gate clock
-  "ti,wait-gate-clock" - gate clock which waits until clock is active before
-			 returning from clk_enable()
-  "ti,dss-gate-clock" - gate clock with DSS specific hardware handling
-  "ti,am35xx-gate-clock" - gate clock with AM35xx specific hardware handling
-  "ti,clkdm-gate-clock" - clockdomain gate clock, which derives its functional
-			  clock directly from a clockdomain, see [3] how
-			  to map clockdomains properly
-  "ti,hsdiv-gate-clock" - gate clock with OMAP36xx specific hardware handling,
-			  required for a hardware errata
-  "ti,composite-gate-clock" - composite gate clock, to be part of composite
-			      clock
-  "ti,composite-no-wait-gate-clock" - composite gate clock that does not wait
-				      for clock to be active before returning
-				      from clk_enable()
-- #clock-cells : from common clock binding; shall be set to 0
-- clocks : link to phandle of parent clock
-- reg : offset for register controlling adjustable gate, not needed for
-	ti,clkdm-gate-clock type
-
-Optional properties:
-- clock-output-names : from common clock binding.
-- ti,bit-shift : bit shift for programming the clock gate, invalid for
-		 ti,clkdm-gate-clock type
-- ti,set-bit-to-disable : inverts default gate programming. Setting the bit
-  gates the clock and clearing the bit ungates the clock.
-
-Examples:
-	mmchs2_fck: mmchs2_fck@48004a00 {
-		#clock-cells = <0>;
-		compatible = "ti,gate-clock";
-		clocks = <&core_96m_fck>;
-		reg = <0x0a00>;
-		ti,bit-shift = <25>;
-	};
-
-	uart4_fck_am35xx: uart4_fck_am35xx {
-		#clock-cells = <0>;
-		compatible = "ti,wait-gate-clock";
-		clocks = <&core_48m_fck>;
-		reg = <0x0a00>;
-		ti,bit-shift = <23>;
-	};
-
-	dss1_alwon_fck_3430es2: dss1_alwon_fck_3430es2@48004e00 {
-		#clock-cells = <0>;
-		compatible = "ti,dss-gate-clock";
-		clocks = <&dpll4_m4x2_ck>;
-		reg = <0x0e00>;
-		ti,bit-shift = <0>;
-	};
-
-	emac_ick: emac_ick@4800259c {
-		#clock-cells = <0>;
-		compatible = "ti,am35xx-gate-clock";
-		clocks = <&ipss_ick>;
-		reg = <0x059c>;
-		ti,bit-shift = <1>;
-	};
-
-	emu_src_ck: emu_src_ck {
-		#clock-cells = <0>;
-		compatible = "ti,clkdm-gate-clock";
-		clocks = <&emu_src_mux_ck>;
-	};
-
-	dpll4_m2x2_ck: dpll4_m2x2_ck@48004d00 {
-		#clock-cells = <0>;
-		compatible = "ti,hsdiv-gate-clock";
-		clocks = <&dpll4_m2x2_mul_ck>;
-		ti,bit-shift = <0x1b>;
-		reg = <0x0d00>;
-		ti,set-bit-to-disable;
-	};
-
-	vlynq_gate_fck: vlynq_gate_fck {
-		#clock-cells = <0>;
-		compatible = "ti,composite-gate-clock";
-		clocks = <&core_ck>;
-		ti,bit-shift = <3>;
-		reg = <0x0200>;
-	};
-
-	sys_clkout2_src_gate: sys_clkout2_src_gate {
-		#clock-cells = <0>;
-		compatible = "ti,composite-no-wait-gate-clock";
-		clocks = <&core_ck>;
-		ti,bit-shift = <15>;
-		reg = <0x0070>;
-	};

Documentation/devicetree/bindings/clock/ti/ti,gate-clock.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/ti/ti,gate-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments gate clock
+
+maintainers:
+  - Tero Kristo <[e-mail]>
+
+description: |
+  *Deprecated design pattern: one node per clock*
+
+  This clock is quite much similar to the basic gate-clock [1], however,
+  it supports a number of additional features. If no register
+  is provided for this clock, the code assumes that a clockdomain
+  will be controlled instead and the corresponding hw-ops for
+  that is used.
+
+  [1] Documentation/devicetree/bindings/clock/gpio-gate-clock.yaml
+  [2] Documentation/devicetree/bindings/clock/ti/clockdomain.txt
+
+properties:
+  compatible:
+    enum:
+      - ti,gate-clock           # basic gate clock
+      - ti,wait-gate-clock      # gate clock which waits until clock is
+                                # active before returning from clk_enable()
+      - ti,dss-gate-clock       # gate clock with DSS specific hardware
+                                # handling
+      - ti,am35xx-gate-clock    # gate clock with AM35xx specific hardware
+                                # handling
+      - ti,clkdm-gate-clock     # clockdomain gate clock, which derives its
+                                # functional clock directly from a
+                                # clockdomain, see [2] how to map
+                                # clockdomains properly
+      - ti,hsdiv-gate-clock     # gate clock with OMAP36xx specific hardware
+                                # handling, required for a hardware errata
+      - ti,composite-gate-clock # composite gate clock, to be part of
+                                # composite clock
+      - ti,composite-no-wait-gate-clock # composite gate clock that does not
+                                        # wait for clock to be active before
+                                        # returning from clk_enable()
+  "#clock-cells":
+    const: 0
+
+  clocks: true
+
+  clock-output-names:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  ti,bit-shift:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of bits to shift the bit-mask
+    maximum: 31
+    default: 0
+
+  ti,set-bit-to-disable:
+    type: boolean
+    description:
+      Inverts default gate programming. Setting the bit
+      gates the clock and clearing the bit ungates the clock.
+
+  ti,set-rate-parent:
+    type: boolean
+    description:
+      clk_set_rate is propagated to parent clock,
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: ti,clkdm-gate-clock
+then:
+  properties:
+    reg: false
+  required:
+    - compatible
+    - "#clock-cells"
+    - clocks
+else:
+  required:
+    - compatible
+    - "#clock-cells"
+    - clocks
+    - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    bus {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      clock-controller@a00 {
+        #clock-cells = <0>;
+        compatible = "ti,gate-clock";
+        clocks = <&core_96m_fck>;
+        reg = <0x0a00>;
+        ti,bit-shift = <25>;
+      };
+
+      clock-controller@d00 {
+        compatible = "ti,hsdiv-gate-clock";
+        reg = <0x0d00>;
+        #clock-cells = <0>;
+        clocks = <&dpll4_m2x2_mul_ck>;
+        ti,bit-shift = <0x1b>;
+        ti,set-bit-to-disable;
+      };
+    };
+
+  - |
+    clock-controller {
+      #clock-cells = <0>;
+      compatible = "ti,clkdm-gate-clock";
+      clocks = <&emu_src_mux_ck>;
+    };
+