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

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Add device tree binding documentation for serial flash with
Mediatek serial flash controller

Signed-off-by: Bayi Cheng <bayi.cheng@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
[Brian: fixed up language]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Bayi Cheng 2015-11-06 23:48:07 +08:00 committed by Brian Norris
parent d2fd05bb67
commit bf9c37cb62
1 changed files with 41 additions and 0 deletions
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Documentation/devicetree/bindings/mtd/mtk-quadspi.txt Normal file
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* 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@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@0 {
compatible = "jedec,spi-nor";
reg = <0>;
};
};