doc: dt: mtd: add documentation for Mediatek spi-nor controller

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=bf9c37cb627a3f690e246d9326a4a94913771bbf
Commit:     bf9c37cb627a3f690e246d9326a4a94913771bbf
Parent:     d2fd05bb6769d53ab98a11b080b3fb889276049d
Author:     Bayi Cheng <bayi.cheng at mediatek.com>
AuthorDate: Fri Nov 6 23:48:07 2015 +0800
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Wed Nov 11 12:37:53 2015 -0800

    doc: dt: mtd: add documentation for Mediatek spi-nor controller
    
    Add device tree binding documentation for serial flash with
    Mediatek serial flash controller
    
    Signed-off-by: Bayi Cheng <bayi.cheng at mediatek.com>
    Acked-by: Rob Herring <robh at kernel.org>
    [Brian: fixed up language]
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
 .../devicetree/bindings/mtd/mtk-quadspi.txt        | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt b/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt
new file mode 100644
index 0000000..fb314f0
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt
@@ -0,0 +1,41 @@
+* Serial NOR flash controller for MTK MT81xx (and similar)
+
+Required properties:
+- compatible: 	  should be "mediatek,mt8173-nor";
+- reg: 		  physical base address and length of the controller's register
+- clocks: 	  the phandle of the clocks needed by the nor controller
+- clock-names: 	  the names of the clocks
+		  the clocks should be named "spi" and "sf". "spi" is used for spi bus,
+		  and "sf" is used for controller, these are the clocks witch
+		  hardware needs to enabling nor flash and nor flash controller.
+		  See Documentation/devicetree/bindings/clock/clock-bindings.txt for details.
+- #address-cells: should be <1>
+- #size-cells:	  should be <0>
+
+The SPI flash must be a child of the nor_flash node and must have a
+compatible property. Also see jedec,spi-nor.txt.
+
+Required properties:
+- compatible:	  May include a device-specific string consisting of the manufacturer
+		  and name of the chip. Must also include "jedec,spi-nor" for any
+		  SPI NOR flash that can be identified by the JEDEC READ ID opcode (0x9F).
+- reg :		  Chip-Select number
+
+Example:
+
+nor_flash: spi at 1100d000 {
+	compatible = "mediatek,mt8173-nor";
+	reg = <0 0x1100d000 0 0xe0>;
+	clocks = <&pericfg CLK_PERI_SPI>,
+		 <&topckgen CLK_TOP_SPINFI_IFR_SEL>;
+	clock-names = "spi", "sf";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "disabled";
+
+	flash at 0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+	};
+};
+