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powerpc: add mmc-spi-slot bindings

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The bindings describes a case where MMC/SD/SDIO slot directly connected to
a SPI bus.  Such setups are widely used on embedded PowerPC boards.

The patch also adds the mmc-spi-slot entry to the OpenFirmware modalias
table.

Signed-off-by: Anton Vorontsov <[email protected]>
Cc: David Brownell <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Grant Likely <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Anton Vorontsov 2009-03-31 15:24:38 -07:00 • committed by Linus Torvalds
commit 3f1c6ebf57
2 changed files with 24 additions and 0 deletions
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23
Documentation/powerpc/dts-bindings/mmc-spi-slot.txt Normal file
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MMC/SD/SDIO slot directly connected to a SPI bus
Required properties:
- compatible : should be "mmc-spi-slot".
- reg : should specify SPI address (chip-select number).
- 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.
- gpios : (optional) may specify GPIOs in this order: Card-Detect GPIO,
Write-Protect GPIO.
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>;
};