Documentation: dt: Add TI SCI clock driver

Texas Instruments TI-SCI Clocks

===============================

All clocks on Texas Instruments' SoCs that contain a System Controller,

are only controlled by this entity. Communication between a host processor

running an OS and the System Controller happens through a protocol known

as TI-SCI[1]. This clock implementation plugs into the common clock

framework and makes use of the TI-SCI protocol on clock API requests.

[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt

Required properties:

-------------------

- compatible: Must be "ti,k2g-sci-clk"

- #clock-cells: Shall be 2.

  In clock consumers, this cell represents the device ID and clock ID

  exposed by the PM firmware. The assignments can be found in the header

  files <dt-bindings/genpd/<soc>.h> (which covers the device IDs) and

  <dt-bindings/clock/<soc>.h> (which covers the clock IDs), where <soc>

  is the SoC involved, for example 'k2g'.

Examples:

--------

pmmc: pmmc {

	compatible = "ti,k2g-sci";

	k2g_clks: clocks {

		compatible = "ti,k2g-sci-clk";

		#clock-cells = <2>;

	};

};

uart0: serial@2530c00 {

	compatible = "ns16550a";

	clocks = <&k2g_clks 0x2c 0>;

};

F:	Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt

F:	include/dt-bindings/genpd/k2g.h

F:	drivers/soc/ti/ti_sci_pm_domains.c

F:	Documentation/devicetree/bindings/clock/ti,sci-clk.txt

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