dt: Move device tree documentation out of powerpc directory

The device tree is used by more than just PowerPC.  Make the documentation
directory available to all.

v2: reorganized files while moving to create arch and driver specific
    directories.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

2 files changed, 52 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mmc/fsl-esdhc.txt b/Documentation/devicetree/bindings/mmc/fsl-esdhc.txt
new file mode 100644
index 000000000000..64bcb8be973c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/fsl-esdhc.txt
@@ -0,0 +1,29 @@
+* Freescale Enhanced Secure Digital Host Controller (eSDHC)
+
+The Enhanced Secure Digital Host Controller provides an interface
+for MMC, SD, and SDIO types of memory cards.
+
+Required properties:
+  - compatible : should be
+    "fsl,<chip>-esdhc", "fsl,esdhc"
+  - reg : should contain eSDHC registers location and length.
+  - interrupts : should contain eSDHC interrupt.
+  - interrupt-parent : interrupt source phandle.
+  - clock-frequency : specifies eSDHC base clock frequency.
+  - sdhci,wp-inverted : (optional) specifies that eSDHC controller
+    reports inverted write-protect state;
+  - sdhci,1-bit-only : (optional) specifies that a controller can
+    only handle 1-bit data transfers.
+  - sdhci,auto-cmd12: (optional) specifies that a controller can
+    only handle auto CMD12.
+
+Example:
+
+sdhci@2e000 {
+        compatible = "fsl,mpc8378-esdhc", "fsl,esdhc";
+        reg = <0x2e000 0x1000>;
+        interrupts = <42 0x8>;
+        interrupt-parent = <&ipic>;
+        /* Filled in by U-Boot */
+        clock-frequency = <0>;
+};
diff --git a/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt b/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt
new file mode 100644
index 000000000000..c39ac2891951
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/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>;
+        };