From: Matthew Gerlach <[email protected]> Device Tree bindings for Version 2 of the Altera Quadspi Controller that can be optionally paired with a windowed bridge.
Signed-off-by: Matthew Gerlach <[email protected]> --- .../devicetree/bindings/mtd/altera-quadspi-v2.txt | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt diff --git a/Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt b/Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt new file mode 100644 index 0000000..8ba63d7 --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt @@ -0,0 +1,37 @@ +* Altera Quad SPI Controller Version 2 + +Required properties: +- compatible : Should be "altr,quadspi-v2". +- reg : Contains at least two entries, and possibly three entries, each of + which is a tuple consisting of a physical address and length. +- reg-names : Should contain the names "avl_csr" and "avl_mem" corresponding + to the control and status registers and qspi memory, respectively. + + +The Altera Quad SPI Controller Version 2 can be paired with a windowed bridge +in order to reduce the footprint of the memory interface. When a windowed +bridge is used, reads and writes of data must be 32 bits wide. + +Optional properties: +- reg-names : Should contain the name "avl_window", if the windowed bridge + is used. This name corresponds to the register space that + controls the window. +- window-size : The size of the window which must be an even power of 2. +- read-bit-reverse : A boolean indicating the data read from the flash should + be bit reversed on a byte by byte basis before being + delivered to the MTD layer. +- write-bit-reverse : A boolean indicating the data written to the flash should + be bit reversed on a byte by byte basis. + +Example: + +qspi: spi@a0001000 { + compatible = "altr,quadspi-v2"; + reg = <0xa0001000 0x40>, <0xb0000000 0x4000000>; + reg-names = "avl_csr", "avl_mem"; + + flash@0 { + reg = <0>; + label = "FPGA Image"; + }; +}; -- 2.7.4
