Device Tree Clock bindings for arch-sunxi

This binding uses the common clock binding[1].

[1] Documentation/devicetree/bindings/clock/clock-bindings.txt

Required properties:
- compatible : shall be one of the following:
	"allwinner,sun4i-a10-osc-clk" - for a gatable oscillator
	"allwinner,sun4i-a10-pll1-clk" - for the main PLL clock and PLL4
	"allwinner,sun6i-a31-pll1-clk" - for the main PLL clock on A31
	"allwinner,sun8i-a23-pll1-clk" - for the main PLL clock on A23
	"allwinner,sun9i-a80-pll4-clk" - for the peripheral PLLs on A80
	"allwinner,sun4i-a10-pll5-clk" - for the PLL5 clock
	"allwinner,sun4i-a10-pll6-clk" - for the PLL6 clock
	"allwinner,sun6i-a31-pll6-clk" - for the PLL6 clock on A31
	"allwinner,sun9i-a80-gt-clk" - for the GT bus clock on A80
	"allwinner,sun4i-a10-cpu-clk" - for the CPU multiplexer clock
	"allwinner,sun4i-a10-axi-clk" - for the AXI clock
	"allwinner,sun8i-a23-axi-clk" - for the AXI clock on A23
	"allwinner,sun4i-a10-axi-gates-clk" - for the AXI gates
	"allwinner,sun4i-a10-ahb-clk" - for the AHB clock
	"allwinner,sun9i-a80-ahb-clk" - for the AHB bus clocks on A80
	"allwinner,sun4i-a10-ahb-gates-clk" - for the AHB gates on A10
	"allwinner,sun5i-a13-ahb-gates-clk" - for the AHB gates on A13
	"allwinner,sun5i-a10s-ahb-gates-clk" - for the AHB gates on A10s
	"allwinner,sun7i-a20-ahb-gates-clk" - for the AHB gates on A20
	"allwinner,sun6i-a31-ar100-clk" - for the AR100 on A31
	"allwinner,sun6i-a31-ahb1-mux-clk" - for the AHB1 multiplexer on A31
	"allwinner,sun6i-a31-ahb1-gates-clk" - for the AHB1 gates on A31
	"allwinner,sun8i-a23-ahb1-gates-clk" - for the AHB1 gates on A23
	"allwinner,sun9i-a80-ahb0-gates-clk" - for the AHB0 gates on A80
	"allwinner,sun9i-a80-ahb1-gates-clk" - for the AHB1 gates on A80
	"allwinner,sun9i-a80-ahb2-gates-clk" - for the AHB2 gates on A80
	"allwinner,sun4i-a10-apb0-clk" - for the APB0 clock
	"allwinner,sun6i-a31-apb0-clk" - for the APB0 clock on A31
	"allwinner,sun8i-a23-apb0-clk" - for the APB0 clock on A23
	"allwinner,sun9i-a80-apb0-clk" - for the APB0 bus clock on A80
	"allwinner,sun4i-a10-apb0-gates-clk" - for the APB0 gates on A10
	"allwinner,sun5i-a13-apb0-gates-clk" - for the APB0 gates on A13
	"allwinner,sun5i-a10s-apb0-gates-clk" - for the APB0 gates on A10s
	"allwinner,sun6i-a31-apb0-gates-clk" - for the APB0 gates on A31
	"allwinner,sun7i-a20-apb0-gates-clk" - for the APB0 gates on A20
	"allwinner,sun8i-a23-apb0-gates-clk" - for the APB0 gates on A23
	"allwinner,sun9i-a80-apb0-gates-clk" - for the APB0 gates on A80
	"allwinner,sun4i-a10-apb1-clk" - for the APB1 clock
	"allwinner,sun9i-a80-apb1-clk" - for the APB1 bus clock on A80
	"allwinner,sun4i-a10-apb1-gates-clk" - for the APB1 gates on A10
	"allwinner,sun5i-a13-apb1-gates-clk" - for the APB1 gates on A13
	"allwinner,sun5i-a10s-apb1-gates-clk" - for the APB1 gates on A10s
	"allwinner,sun6i-a31-apb1-gates-clk" - for the APB1 gates on A31
	"allwinner,sun7i-a20-apb1-gates-clk" - for the APB1 gates on A20
	"allwinner,sun8i-a23-apb1-gates-clk" - for the APB1 gates on A23
	"allwinner,sun9i-a80-apb1-gates-clk" - for the APB1 gates on A80
	"allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
	"allwinner,sun8i-a23-apb2-gates-clk" - for the APB2 gates on A23
	"allwinner,sun5i-a13-mbus-clk" - for the MBUS clock on A13
	"allwinner,sun4i-a10-mmc-output-clk" - for the MMC output clock on A10
	"allwinner,sun4i-a10-mmc-sample-clk" - for the MMC sample clock on A10
	"allwinner,sun4i-a10-mod0-clk" - for the module 0 family of clocks
	"allwinner,sun8i-a23-mbus-clk" - for the MBUS clock on A23
	"allwinner,sun7i-a20-out-clk" - for the external output clocks
	"allwinner,sun7i-a20-gmac-clk" - for the GMAC clock module on A20/A31
	"allwinner,sun4i-a10-usb-clk" - for usb gates + resets on A10 / A20
	"allwinner,sun5i-a13-usb-clk" - for usb gates + resets on A13
	"allwinner,sun6i-a31-usb-clk" - for usb gates + resets on A31

Required properties for all clocks:
- reg : shall be the control register address for the clock.
- clocks : shall be the input parent clock(s) phandle for the clock. For
	multiplexed clocks, the list order must match the hardware
	programming order.
- #clock-cells : from common clock binding; shall be set to 0 except for
	the following compatibles where it shall be set to 1:
	"allwinner,*-gates-clk", "allwinner,sun4i-pll5-clk",
	"allwinner,sun4i-pll6-clk", "allwinner,sun6i-a31-pll6-clk"
- clock-output-names : shall be the corresponding names of the outputs.
	If the clock module only has one output, the name shall be the
	module name.

And "allwinner,*-usb-clk" clocks also require:
- reset-cells : shall be set to 1

For "allwinner,sun7i-a20-gmac-clk", the parent clocks shall be fixed rate
dummy clocks at 25 MHz and 125 MHz, respectively. See example.

Clock consumers should specify the desired clocks they use with a
"clocks" phandle cell. Consumers that are using a gated clock should
provide an additional ID in their clock property. This ID is the
offset of the bit controlling this particular gate in the register.
For the other clocks with "#clock-cells" = 1, the additional ID shall
refer to the index of the output.

For "allwinner,sun6i-a31-pll6-clk", there are 2 outputs. The first output
is the normal PLL6 output, or "pll6". The second output is rate doubled
PLL6, or "pll6x2".

For example:

osc24M: clk@01c20050 {
	#clock-cells = <0>;
	compatible = "allwinner,sun4i-a10-osc-clk";
	reg = <0x01c20050 0x4>;
	clocks = <&osc24M_fixed>;
	clock-output-names = "osc24M";
};

pll1: clk@01c20000 {
	#clock-cells = <0>;
	compatible = "allwinner,sun4i-a10-pll1-clk";
	reg = <0x01c20000 0x4>;
	clocks = <&osc24M>;
	clock-output-names = "pll1";
};

pll5: clk@01c20020 {
	#clock-cells = <1>;
	compatible = "allwinner,sun4i-pll5-clk";
	reg = <0x01c20020 0x4>;
	clocks = <&osc24M>;
	clock-output-names = "pll5_ddr", "pll5_other";
};

pll6: clk@01c20028 {
	#clock-cells = <1>;
	compatible = "allwinner,sun6i-a31-pll6-clk";
	reg = <0x01c20028 0x4>;
	clocks = <&osc24M>;
	clock-output-names = "pll6", "pll6x2";
};

cpu: cpu@01c20054 {
	#clock-cells = <0>;
	compatible = "allwinner,sun4i-a10-cpu-clk";
	reg = <0x01c20054 0x4>;
	clocks = <&osc32k>, <&osc24M>, <&pll1>;
	clock-output-names = "cpu";
};

mmc0_clk: clk@01c20088 {
	#clock-cells = <0>;
	compatible = "allwinner,sun4i-mod0-clk";
	reg = <0x01c20088 0x4>;
	clocks = <&osc24M>, <&pll6 1>, <&pll5 1>;
	clock-output-names = "mmc0";
};

mii_phy_tx_clk: clk@2 {
	#clock-cells = <0>;
	compatible = "fixed-clock";
	clock-frequency = <25000000>;
	clock-output-names = "mii_phy_tx";
};

gmac_int_tx_clk: clk@3 {
	#clock-cells = <0>;
	compatible = "fixed-clock";
	clock-frequency = <125000000>;
	clock-output-names = "gmac_int_tx";
};

gmac_clk: clk@01c20164 {
	#clock-cells = <0>;
	compatible = "allwinner,sun7i-a20-gmac-clk";
	reg = <0x01c20164 0x4>;
	/*
	 * The first clock must be fixed at 25MHz;
	 * the second clock must be fixed at 125MHz
	 */
	clocks = <&mii_phy_tx_clk>, <&gmac_int_tx_clk>;
	clock-output-names = "gmac";
};