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MMC/SD/SDIO slot directly connected to a SPI bus
This file documents differences between the core properties described
by mmc.txt and the properties used by the mmc_spi driver.
Required properties:
- spi-max-frequency : maximum frequency for this device (Hz).
- voltage-ranges : two cells are required, first cell specifies minimum
slot voltage (mV), second cell specifies maximum slot voltage (mV).
Several ranges could be specified.
Optional properties:
- gpios : may specify GPIOs in this order: Card-Detect GPIO,
Write-Protect GPIO. Note that this does not follow the
binding from mmc.txt, for historical reasons.
Example:
mmc-slot@0 {
compatible = "fsl,mpc8323rdb-mmc-slot",
"mmc-spi-slot";
reg = <0>;
gpios = <&qe_pio_d 14 1
&qe_pio_d 15 0>;
voltage-ranges = <3300 3300>;
spi-max-frequency = <50000000>;
interrupts = <42>;
interrupt-parent = <&PIC>;
};
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