Synopsys Designware Mobile Storage Host Controller extensions
used in Synopsys ARC devboards
Required Properties:
* compatible: should be - "snps,dw-mshc".
* bus-width: number of data lines connected to the controller.
* clocks: from common clock binding: handle to biu and ciu clocks for the
bus interface unit clock and the card interface unit clock.
* clock-names: from common clock binding: Shall be "biu" and "ciu".
Optional properties:
* fifo-depth: The maximum size of the tx/rx fifo's. If this property is not
specified, the default value of the fifo size is determined from the
controller registers.
* fifo-mode: Don't use DMA.
* max-frequency: Maximum operating clock frequency, driver uses 'ciu' clock
frequency if it is not set.
Example:
mmc0@f000a000 {
compatible = "snps,dw-mshc";
reg = <0xf000a000 0x400>;
bus-width = <4>;
fifo-depth = <256>;
clocks = <&mmcclk_biu>, <&mmcclk_ciu>;
clock-names = "biu", "ciu";
max-frequency = <25000000>;
};