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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-03-31 15:24:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 08:59:23 -0700
commit3f1c6ebf57b815ad709e89291e446935fee78f75 (patch)
treef80e2cc24cf7cab1fc4b33c6f32de125073e57b0 /Documentation/powerpc
parent35b4b3c0c1265f1a7342574be393c157601401f0 (diff)
downloadop-kernel-dev-3f1c6ebf57b815ad709e89291e446935fee78f75.zip
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powerpc: add mmc-spi-slot bindings
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 <avorontsov@ru.mvista.com> Cc: David Brownell <david-b@pacbell.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kumar Gala <galak@gate.crashing.org> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/dts-bindings/mmc-spi-slot.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt b/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt
new file mode 100644
index 0000000..c39ac28
--- /dev/null
+++ b/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt
@@ -0,0 +1,23 @@
+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>;
+ };
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