Documentation: add the binding file for Freescale QuadSPI driver

This patch adds the binding file for Freescale QuadSPI driver.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt b/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
new file mode 100644 (file)
index 0000000..823d134
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
@@ -0,0 +1,35 @@
+* Freescale Quad Serial Peripheral Interface(QuadSPI)
+
+Required properties:
+  - compatible : Should be "fsl,vf610-qspi"
+  - reg : the first contains the register location and length,
+          the second contains the memory mapping address and length
+  - reg-names: Should contain the reg names "QuadSPI" and "QuadSPI-memory"
+  - interrupts : Should contain the interrupt for the device
+  - clocks : The clocks needed by the QuadSPI controller
+  - clock-names : the name of the clocks
+
+Optional properties:
+  - fsl,qspi-has-second-chip: The controller has two buses, bus A and bus B.
+                              Each bus can be connected with two NOR flashes.
+                             Most of the time, each bus only has one NOR flash
+                             connected, this is the default case.
+                             But if there are two NOR flashes connected to the
+                             bus, you should enable this property.
+                             (Please check the board's schematic.)
+
+Example:
+
+qspi0: quadspi@40044000 {
+       compatible = "fsl,vf610-qspi";
+       reg = <0x40044000 0x1000>, <0x20000000 0x10000000>;
+       reg-names = "QuadSPI", "QuadSPI-memory";
+       interrupts = <0 24 IRQ_TYPE_LEVEL_HIGH>;
+       clocks = <&clks VF610_CLK_QSPI0_EN>,
+               <&clks VF610_CLK_QSPI0>;
+       clock-names = "qspi_en", "qspi";
+
+       flash0: s25fl128s@0 {
+               ....
+       };
+};