[RFC PATCH 3/4] dt-bindings: Add binding file for NXP FlexSPI driver

[Yogesh Gaur]

Added binding file for NXP FlexSPI driver in Documentation folder.

Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur at nxp.com>
---
 .../devicetree/bindings/mtd/nxp-flexspi.txt        | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mtd/nxp-flexspi.txt

diff --git a/Documentation/devicetree/bindings/mtd/nxp-flexspi.txt b/Documentation/devicetree/bindings/mtd/nxp-flexspi.txt
new file mode 100644
index 0000000..23817dc
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/nxp-flexspi.txt
@@ -0,0 +1,40 @@
+* NXP Flex Serial Peripheral Interface(FlexSPI)
+
+Required properties:
+  - compatible : Should be "nxp,lx2160a-fspi"
+  - 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 "FSPI" and "FSPI-memory"
+  - interrupts : Should contain the interrupt for the device
+
+Optional properties:
+  - nxp,fspi-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.)
+  - big-endian : That means the IP register is big endian. If not specified,
+		 IP register works in little endian mode.
+
+Example:
+fspi0: flexspi at 20c0000 {
+	compatible = "nxp,lx2160a-fspi";
+	reg = <0x0 0x20c0000 0x0 0x10000>, <0x0 0x20000000 0x0 0x10000000>;
+	reg-names = "FSPI", "FSPI-memory";
+	interrupts = <0 25 0x4>; /* Level high type */
+
+	status = "okay";
+	nxp,fspi-has-second-chip;
+	flash0: mt35xu512aba at 0 {
+		reg = <0>;
+		....
+	};
+
+	flash1: mt35xu512aba at 1 {
+		reg = <1>;
+		....
+	};
+
+};
-- 
1.9.1