1 MMC/SD/SDIO slot directly connected to a SPI bus
4 - compatible : should be "mmc-spi-slot".
5 - reg : should specify SPI address (chip-select number).
6 - spi-max-frequency : maximum frequency for this device (Hz).
7 - voltage-ranges : two cells are required, first cell specifies minimum
8 slot voltage (mV), second cell specifies maximum slot voltage (mV).
9 Several ranges could be specified.
12 - gpios : may specify GPIOs in this order: Card-Detect GPIO,
14 - interrupts : the interrupt of a card detect interrupt.
15 - interrupt-parent : the phandle for the interrupt controller that
16 services interrupts for this device.
21 compatible = "fsl,mpc8323rdb-mmc-slot",
24 gpios = <&qe_pio_d 14 1
26 voltage-ranges = <3300 3300>;
27 spi-max-frequency = <50000000>;
29 interrupt-parent = <&PIC>;