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

Convert the OMAP mux 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.

Signed-off-by: Andreas Kemnade <[e-mail]>
Reviewed-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

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

···
 "ti,*composite*-clock" types.
 
 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-[2] Documentation/devicetree/bindings/clock/ti/mux.txt
+[2] Documentation/devicetree/bindings/clock/ti/ti,mux-clock.yaml
 [3] Documentation/devicetree/bindings/clock/ti/ti,divider-clock.yaml
 [4] Documentation/devicetree/bindings/clock/ti/gate.txt
 

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

···
-Binding for TI mux clock.
-
-This binding uses the common clock binding[1].  It assumes a
-register-mapped multiplexer with multiple input clock signals or
-parents, one of which can be selected as output.  This clock does not
-gate or adjust the parent rate via a divider or multiplier.
-
-By default the "clocks" property lists the parents in the same order
-as they are programmed into the register.  E.g:
-
-	clocks = <&foo_clock>, <&bar_clock>, <&baz_clock>;
-
-results in programming the register as follows:
-
-register value		selected parent clock
-0			foo_clock
-1			bar_clock
-2			baz_clock
-
-Some clock controller IPs do not allow a value of zero to be programmed
-into the register, instead indexing begins at 1.  The optional property
-"index-starts-at-one" modified the scheme as follows:
-
-register value		selected clock parent
-1			foo_clock
-2			bar_clock
-3			baz_clock
-
-The binding must provide the register to control the mux. Optionally
-the number of bits to shift the control field in the register can be
-supplied. If the shift value is missing it is the same as supplying
-a zero shift.
-
-[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Required properties:
-- compatible : shall be "ti,mux-clock" or "ti,composite-mux-clock".
-- #clock-cells : from common clock binding; shall be set to 0.
-- clocks : link phandles of parent clocks
-- reg : register offset for register controlling adjustable mux
-
-Optional properties:
-- clock-output-names : from common clock binding.
-- ti,bit-shift : number of bits to shift the bit-mask, defaults to
-  0 if not present
-- ti,index-starts-at-one : valid input select programming starts at 1, not
-  zero
-- ti,set-rate-parent : clk_set_rate is propagated to parent clock,
-  not supported by the composite-mux-clock subtype
-- ti,latch-bit : latch the mux value to HW, only needed if the register
-  access requires this. As an example, dra7x DPLL_GMAC H14 muxing
-  implements such behavior.
-
-Examples:
-
-sys_clkin_ck: sys_clkin_ck@4a306110 {
-	#clock-cells = <0>;
-	compatible = "ti,mux-clock";
-	clocks = <&virt_12000000_ck>, <&virt_13000000_ck>, <&virt_16800000_ck>, <&virt_19200000_ck>, <&virt_26000000_ck>, <&virt_27000000_ck>, <&virt_38400000_ck>;
-	reg = <0x0110>;
-	ti,index-starts-at-one;
-};
-
-abe_dpll_bypass_clk_mux_ck: abe_dpll_bypass_clk_mux_ck@4a306108 {
-	#clock-cells = <0>;
-	compatible = "ti,mux-clock";
-	clocks = <&sys_clkin_ck>, <&sys_32k_ck>;
-	ti,bit-shift = <24>;
-	reg = <0x0108>;
-};
-
-mcbsp5_mux_fck: mcbsp5_mux_fck {
-	#clock-cells = <0>;
-	compatible = "ti,composite-mux-clock";
-	clocks = <&core_96m_fck>, <&mcbsp_clks>;
-	ti,bit-shift = <4>;
-	reg = <0x02d8>;
-};

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

···
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/ti/ti,mux-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments mux clock
+
+maintainers:
+  - Tero Kristo <[e-mail]>
+
+description: |
+  This clock assumes a register-mapped multiplexer with multiple inpt clock
+  signals or parents, one of which can be selected as output. This clock does
+  not gate or adjust the parent rate via a divider or multiplier.
+
+  By default the "clocks" property lists the parents in the same order
+  as they are programmed into the register.  E.g:
+
+    clocks = <&foo_clock>, <&bar_clock>, <&baz_clock>;
+
+  Results in programming the register as follows:
+
+  register value   selected parent clock
+  0                foo_clock
+  1                bar_clock
+  2                baz_clock
+
+  Some clock controller IPs do not allow a value of zero to be programmed
+  into the register, instead indexing begins at 1.  The optional property
+  "index-starts-at-one" modified the scheme as follows:
+
+  register value   selected clock parent
+  1                foo_clock
+  2                bar_clock
+  3                baz_clock
+
+  The binding must provide the register to control the mux. Optionally
+  the number of bits to shift the control field in the register can be
+  supplied. If the shift value is missing it is the same as supplying
+  a zero shift.
+
+properties:
+  compatible:
+    enum:
+      - ti,mux-clock
+      - ti,composite-mux-clock
+
+  "#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,index-starts-at-one:
+    type: boolean
+    description:
+      Valid input select programming starts at 1, not zero
+
+  ti,set-rate-parent:
+    type: boolean
+    description:
+      clk_set_rate is propagated to parent clock,
+      not supported by the composite-mux-clock subtype.
+
+  ti,latch-bit:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Latch the mux value to HW, only needed if the register
+      access requires this. As an example, dra7x DPLL_GMAC H14 muxing
+      implements such behavior.
+    maximum: 31
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: ti,composite-mux-clock
+then:
+  properties:
+    ti,set-rate-parent: false
+
+required:
+  - compatible
+  - "#clock-cells"
+  - clocks
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    bus {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      clock-controller@110 {
+        compatible = "ti,mux-clock";
+        reg = <0x0110>;
+        #clock-cells = <0>;
+        clocks = <&virt_12000000_ck>, <&virt_13000000_ck>, <&virt_16800000_ck>;
+        ti,index-starts-at-one;
+        ti,set-rate-parent;
+      };
+
+      clock-controller@120 {
+        compatible = "ti,composite-mux-clock";
+        reg = <0x0120>;
+        #clock-cells = <0>;
+        clocks = <&core_96m_fck>, <&mcbsp_clks>;
+        ti,bit-shift = <4>;
+      };
+    };