From: Graham Moore <grmoore@xxxxxxxxxxxxxxxxxxxxx> Add binding document for the Cadence QSPI controller. Signed-off-by: Graham Moore <grmoore@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Marek Vasut <marex@xxxxxxx> Cc: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx> Cc: Brian Norris <computersforpeace@xxxxxxxxx> Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx> Cc: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx> Cc: Graham Moore <grmoore@xxxxxxxxxxxxxxxxxxxxx> Cc: Vikas MANOCHA <vikas.manocha@xxxxxx> Cc: Yves Vandervennet <yvanderv@xxxxxxxxxxxxxxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx --- .../devicetree/bindings/mtd/cadence_quadspi.txt | 50 ++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/cadence_quadspi.txt V2: Add cdns prefix to driver-specific bindings. V3: Use existing property "is-decoded-cs" instead of creating a duplicate, "ext-decoder". Timing parameters are in nanoseconds, not master reference clocks. Remove bus-num completely. V4: Add new properties fifo-width and trigger-address V7: - Prefix all of the Cadence-specific properties with cdns prefix, those are in particular "cdns,is-decoded-cs", "cdns,fifo-depth", "cdns,fifo-width", "cdns,trigger-address". - Drop bogus properties which were not used and were incorrect. diff --git a/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt new file mode 100644 index 0000000..ebaf1fd --- /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. +- cdns,fifo-depth : Size of the data FIFO in words. +- cdns,fifo-width: Bus width of the data FIFO in bytes. +- cdns,trigger-address : 32-bit indirect AHB trigger address. + +Optional properties: +- cdns,is-decoded-cs : Flag to indicate whether decoder is used or not. + +Optional subnodes: +Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional +custom properties: +- cdns,read-delay : Delay for read capture logic, in clock cycles +- cdns,tshsl-ns : Delay in nanoseconds for the length that the master mode chip select outputs are de-asserted between transactions. +- cdns,tsd2d-ns : Delay in nanoseconds between one chip select being de-activated and the activation of another. +- cdns,tchsh-ns : Delay in nanoseconds between last bit of current transaction and deasserting the device chip select (qspi_n_ss_out). +- cdns,tslch-ns : Delay in nanoseconds 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>; + cdns,is-decoded-cs; + cdns,fifo-depth = <128>; + cdns,fifo-width = <4>; + cdns,trigger-address = <0x00000000>; + + flash0: n25q00@0 { + ... + cdns,read-delay = <4>; + cdns,tshsl-ns = <50>; + cdns,tsd2d-ns = <50>; + cdns,tchsh-ns = <4>; + cdns,tslch-ns = <4>; + }; + }; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html