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* Marvell sdhci-pxa v2/v3 controller

This file documents differences between the core properties in mmc.txt
and the properties used by the sdhci-pxav2 and sdhci-pxav3 drivers.

Required properties:
- compatible: Should be "mrvl,pxav2-mmc", "mrvl,pxav3-mmc" or
  "marvell,armada-380-sdhci".
- reg:
  * for "mrvl,pxav2-mmc" and "mrvl,pxav3-mmc", one register area for
    the SDHCI registers.
  * for "marvell,armada-380-sdhci", two register areas. The first one
    for the SDHCI registers themselves, and the second one for the
    AXI/Mbus bridge registers of the SDHCI unit.

Optional properties:
- mrvl,clk-delay-cycles: Specify a number of cycles to delay for tuning.

Example:

sdhci@d4280800 {
	compatible = "mrvl,pxav3-mmc";
	reg = <0xd4280800 0x800>;
	bus-width = <8>;
	interrupts = <27>;
	non-removable;
	mrvl,clk-delay-cycles = <31>;
};

sdhci@d8000 {
	compatible = "marvell,armada-380-sdhci";
	reg = <0xd8000 0x1000>, <0xdc000 0x100>;
	interrupts = <0 25 0x4>;
	clocks = <&gateclk 17>;
	mrvl,clk-delay-cycles = <0x1F>;
};