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