dt-bindings: spi: Move the bindings for the FSL QSPI driver

Move the documentation of the old SPI NOR driver to the place of the new
SPI memory interface based driver.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt
new file mode 100644
index 000000000000..483e9cfac1b1
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt
@@ -0,0 +1,65 @@
+* Freescale Quad Serial Peripheral Interface(QuadSPI)
+
+Required properties:
+  - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi",
+		 "fsl,imx7d-qspi", "fsl,imx6ul-qspi",
+		 "fsl,ls1021a-qspi"
+		 or
+		 "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi",
+		 "fsl,ls1043a-qspi" followed by "fsl,ls1021a-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 : Should contain the name of the clocks: "qspi_en" and "qspi".
+
+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.)
+  - big-endian : That means the IP register is big endian
+
+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 {
+		....
+	};
+};
+
+Example showing the usage of two SPI NOR devices:
+
+&qspi2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_qspi2>;
+	status = "okay";
+
+	flash0: n25q256a@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "micron,n25q256a", "jedec,spi-nor";
+		spi-max-frequency = <29000000>;
+		reg = <0>;
+	};
+
+	flash1: n25q256a@1 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "micron,n25q256a", "jedec,spi-nor";
+		spi-max-frequency = <29000000>;
+		reg = <1>;
+	};
+};