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author | Joel Holdsworth <joel@airwebreathe.org.uk> | 2017-02-28 01:14:25 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-17 09:10:48 +0300 |
commit | e10c11d2739fd3657d8d1d5b1fa06f9185b4f012 (patch) | |
tree | 92274c80a56e07dc0b5e6892cb0c8648464b1a12 /Documentation/devicetree/bindings/fpga | |
parent | f677e0f3ed45a4fcd6270d43b25ff9abb92da608 (diff) | |
download | linux-e10c11d2739fd3657d8d1d5b1fa06f9185b4f012.tar.xz |
Documentation: Add binding document for Lattice iCE40 FPGA manager
This adds documentation of the device tree bindings of the Lattice iCE40
FPGA driver for the FPGA manager framework.
Signed-off-by: Joel Holdsworth <joel@airwebreathe.org.uk>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/devicetree/bindings/fpga')
-rw-r--r-- | Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt new file mode 100644 index 000000000000..4dc412437b08 --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt @@ -0,0 +1,21 @@ +Lattice iCE40 FPGA Manager + +Required properties: +- compatible: Should contain "lattice,ice40-fpga-mgr" +- reg: SPI chip select +- spi-max-frequency: Maximum SPI frequency (>=1000000, <=25000000) +- cdone-gpios: GPIO input connected to CDONE pin +- reset-gpios: Active-low GPIO output connected to CRESET_B pin. Note + that unless the GPIO is held low during startup, the + FPGA will enter Master SPI mode and drive SCK with a + clock signal potentially jamming other devices on the + bus until the firmware is loaded. + +Example: + fpga: fpga@0 { + compatible = "lattice,ice40-fpga-mgr"; + reg = <0>; + spi-max-frequency = <1000000>; + cdone-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>; + reset-gpios = <&gpio 22 GPIO_ACTIVE_LOW>; + }; |