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* Gated Clock bindings for Marvell Orion SoCs

Marvell Dove and Kirkwood allow some peripheral clocks to be gated to save
some power. The clock consumer should specify the desired clock by having
the clock ID in its "clocks" phandle cell. The clock ID is directly mapped to
the corresponding clock gating control bit in HW to ease manual clock lookup
in datasheet.

The following is a list of provided IDs for Armada 370:
ID	Clock	Peripheral
-----------------------------------
0	Audio	AC97 Cntrl
1	pex0_en	PCIe 0 Clock out
2	pex1_en	PCIe 1 Clock out
3	ge1	Gigabit Ethernet 1
4	ge0	Gigabit Ethernet 0
5	pex0	PCIe Cntrl 0
9	pex1	PCIe Cntrl 1
15	sata0	SATA Host 0
17	sdio	SDHCI Host
25	tdm	Time Division Mplx
28	ddr	DDR Cntrl
30	sata1	SATA Host 0

The following is a list of provided IDs for Armada XP:
ID	Clock	Peripheral
-----------------------------------
0	audio	Audio Cntrl
1	ge3	Gigabit Ethernet 3
2	ge2	Gigabit Ethernet 2
3	ge1	Gigabit Ethernet 1
4	ge0	Gigabit Ethernet 0
5	pex0	PCIe Cntrl 0
6	pex1	PCIe Cntrl 1
7	pex2	PCIe Cntrl 2
8	pex3	PCIe Cntrl 3
13	bp
14	sata0lnk
15	sata0	SATA Host 0
16	lcd	LCD Cntrl
17	sdio	SDHCI Host
18	usb0	USB Host 0
19	usb1	USB Host 1
20	usb2	USB Host 2
22	xor0	XOR DMA 0
23	crypto	CESA engine
25	tdm	Time Division Mplx
28	xor1	XOR DMA 1
29	sata1lnk
30	sata1	SATA Host 0

The following is a list of provided IDs for Dove:
ID	Clock	Peripheral
-----------------------------------
0	usb0	USB Host 0
1	usb1	USB Host 1
2	ge	Gigabit Ethernet
3	sata	SATA Host
4	pex0	PCIe Cntrl 0
5	pex1	PCIe Cntrl 1
8	sdio0	SDHCI Host 0
9	sdio1	SDHCI Host 1
10	nand	NAND Cntrl
11	camera	Camera Cntrl
12	i2s0	I2S Cntrl 0
13	i2s1	I2S Cntrl 1
15	crypto	CESA engine
21	ac97	AC97 Cntrl
22	pdma	Peripheral DMA
23	xor0	XOR DMA 0
24	xor1	XOR DMA 1
30	gephy	Gigabit Ethernel PHY
Note: gephy(30) is implemented as a parent clock of ge(2)

The following is a list of provided IDs for Kirkwood:
ID	Clock	Peripheral
-----------------------------------
0	ge0	Gigabit Ethernet 0
2	pex0	PCIe Cntrl 0
3	usb0	USB Host 0
4	sdio	SDIO Cntrl
5	tsu	Transp. Stream Unit
6	dunit	SDRAM Cntrl
7	runit	Runit
8	xor0	XOR DMA 0
9	audio	I2S Cntrl 0
14	sata0	SATA Host 0
15	sata1	SATA Host 1
16	xor1	XOR DMA 1
17	crypto	CESA engine
18	pex1	PCIe Cntrl 1
19	ge1	Gigabit Ethernet 0
20	tdm	Time Division Mplx

Required properties:
- compatible : shall be one of the following:
	"marvell,dove-gating-clock" - for Dove SoC clock gating
	"marvell,kirkwood-gating-clock" - for Kirkwood SoC clock gating
- reg : shall be the register address of the Clock Gating Control register
- #clock-cells : from common clock binding; shall be set to 1

Optional properties:
- clocks : default parent clock phandle (e.g. tclk)

Example:

gate_clk: clock-gating-control@d0038 {
	compatible = "marvell,dove-gating-clock";
	reg = <0xd0038 0x4>;
	/* default parent clock is tclk */
	clocks = <&core_clk 0>;
	#clock-cells = <1>;
};

sdio0: sdio@92000 {
	compatible = "marvell,dove-sdhci";
	/* get clk gate bit 8 (sdio0) */
	clocks = <&gate_clk 8>;
};