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

Convert the OMAP divider clock device tree binding to json-schema.
Specify the creator of the original binding as a maintainer.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Link: https://lore.kernel.org/r/20241018085347.95071-3-andreas@kemnade.info
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: akemnade

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

@@ -17,7 +17,7 @@ merged to this clock. The component clocks shall be of one of the
 
 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
 [2] Documentation/devicetree/bindings/clock/ti/mux.txt
-[3] Documentation/devicetree/bindings/clock/ti/divider.txt
+[3] Documentation/devicetree/bindings/clock/ti/ti,divider-clock.yaml
 [4] Documentation/devicetree/bindings/clock/ti/gate.txt
 
 Required properties:

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

@@ -0,0 +1,193 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/ti/ti,divider-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments divider clock
+
+maintainers:
+  - Tero Kristo <kristo@kernel.org>
+
+description: |
+  This clock It assumes a register-mapped adjustable clock rate divider
+  that does not gate and has only one input clock or parent.  By default the
+  value programmed into the register is one less than the actual divisor value.
+  E.g:
+
+  register value    actual divisor value
+  0                 1
+  1                 2
+  2                 3
+
+  This assumption may be modified by the following optional properties:
+
+  ti,index-starts-at-one - valid divisor values start at 1, not the default
+  of 0.  E.g:
+  register value    actual divisor value
+  1                 1
+  2                 2
+  3                 3
+
+  ti,index-power-of-two - valid divisor values are powers of two.  E.g:
+  register value    actual divisor value
+  0                 1
+  1                 2
+  2                 4
+
+  Additionally an array of valid dividers may be supplied like so:
+
+  ti,dividers = <4>, <8>, <0>, <16>;
+
+  Which will map the resulting values to a divisor table by their index:
+  register value    actual divisor value
+  0                 4
+  1                 8
+  2                 <invalid divisor, skipped>
+  3                 16
+
+  Any zero value in this array means the corresponding bit-value is invalid
+  and must not be used.
+
+  The binding must also provide the register to control the divider and
+  unless the divider array is provided, min and max dividers. Optionally
+  the number of bits to shift that mask, if necessary. If the shift value
+  is missing it is the same as supplying a zero shift.
+
+  This binding can also optionally provide support to the hardware autoidle
+  feature, see [1].
+
+  [1] Documentation/devicetree/bindings/clock/ti/autoidle.txt
+
+properties:
+  compatible:
+    enum:
+      - ti,divider-clock
+      - ti,composite-divider-clock
+
+  "#clock-cells":
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  clock-output-names:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  ti,dividers:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      array of integers defining divisors
+
+  ti,bit-shift:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      number of bits to shift the divider value
+    maximum: 31
+    default: 0
+
+  ti,min-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      min divisor for dividing the input clock rate, only
+      needed if the first divisor is offset from the default value (1)
+    minimum: 1
+    default: 1
+
+
+  ti,max-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      max divisor for dividing the input clock rate, only needed
+      if ti,dividers is not defined.
+
+  ti,index-starts-at-one:
+    type: boolean
+    description:
+      valid divisor programming starts at 1, not zero,
+      only valid if ti,dividers is not defined
+
+  ti,index-power-of-two:
+    type: boolean
+    description:
+      valid divisor programming must be a power of two,
+      only valid if ti,dividers is not defined.
+
+  ti,autoidle-shift:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      bit shift of the autoidle enable bit for the clock,
+      see [1].
+    maximum: 31
+    default: 0
+
+  ti,invert-autoidle-bit:
+    type: boolean
+    description:
+      autoidle is enabled by setting the bit to 0,
+      see [1]
+
+  ti,set-rate-parent:
+    type: boolean
+    description:
+      clk_set_rate is propagated to parent            |
+
+  ti,latch-bit:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      latch the divider value to HW, only needed if the register
+      compatible access requires this. As an example dra76x DPLL_GMAC
+      H14 divider implements such behavior.
+
+dependentSchemas:
+  ti,dividers:
+    properties:
+      ti,min-div: false
+      ti,max-div: false
+      ti,index-power-of-two: false
+      ti,index-starts-at-one: false
+
+required:
+  - compatible
+  - "#clock-cells"
+  - clocks
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    bus {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      clock-controller@190 {
+        #clock-cells = <0>;
+        compatible = "ti,divider-clock";
+        clocks = <&dpll_usb_ck>;
+        ti,max-div = <127>;
+        reg = <0x190>;
+        ti,index-starts-at-one;
+      };
+
+      clock-controller@528 {
+        #clock-cells = <0>;
+        compatible = "ti,divider-clock";
+        clocks = <&abe_clk>;
+        ti,bit-shift = <24>;
+        reg = <0x528>;
+        ti,max-div = <2>;
+      };
+
+      clock-controller@a40 {
+        #clock-cells = <0>;
+        compatible = "ti,composite-divider-clock";
+        clocks = <&corex2_fck>;
+        ti,bit-shift = <8>;
+        reg = <0x0a40>;
+        ti,dividers = <0>, <1>, <2>, <3>, <4>, <0>, <6>, <0>, <8>;
+      };
+    };