Signed-off-by: Graham Moore <grmo...@opensource.altera.com> --- .../devicetree/bindings/mtd/cadence_quadspi.txt | 50 ++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/cadence_quadspi.txt
diff --git a/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt new file mode 100644 index 0000000..3a8ea1c --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt @@ -0,0 +1,50 @@ +* Cadence Quad SPI controller + +Required properties: +- compatible : Should be "cdns,qspi-nor". +- reg : Contains two entries, each of which is a tuple consisting of a + physical address and length. The first entry is the address and + length of the controller register set. The second entry is the + address and length of the QSPI Controller data area. +- interrupts : Unit interrupt specifier for the controller interrupt. +- clocks : phandle to the Quad SPI clock. +- ext-decoder : Value of 0 means no external chipselect decoder is + connected, 1 means there is an external chipselect decoder connected. +- fifo-depth : Size of the data FIFO in words. +- bus-num : Number of the SPI bus to which the controller is connected. + +Optional subnodes: +Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional +custom properties: +- cdns,page-size : Size, in bytes, of the device's write page +- cdns,block-size : Size of the device's erase block +- cdns,read-delay : Selay for read capture logic, in clock cycles +- cdns,tshsl-ns : Delay in master reference clocks for the length that the master mode chip select outputs are de-asserted between transactions. +- cdns,tsd2d-ns : Delay in master reference clocks between one chip select being de-activated and the activation of another. +- cdns,tchsh-ns : Delay in master reference clocks between last bit of current transaction and deasserting the device chip select (qspi_n_ss_out). +- cdns,tslch-ns : Delay in master reference clocks between setting qspi_n_ss_out low and first bit transfer. + +Example: + + qspi: spi@ff705000 { + compatible = "cdns,qspi-nor"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0xff705000 0x1000>, + <0xffa00000 0x1000>; + interrupts = <0 151 4>; + clocks = <&qspi_clk>; + ext-decoder = <0>; + fifo-depth = <128>; + + flash0: n25q00@0 { + ... + cdns,page-size = <256>; + cdns,block-size = <16>; + cdns,read-delay = <4>; + cdns,tshsl-ns = <50>; + cdns,tsd2d-ns = <50>; + cdns,tchsh-ns = <4>; + cdns,tslch-ns = <4>; + } + } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/