[PATCH v6 2/3] Documentation: Add binding document for Lattice iCE40 FPGA manager
From: Joel Holdsworth <hidden>
Date: 2016-11-01 04:51:12
Also in:
linux-spi, lkml
Subsystem:
fpga manager framework, open firmware and flattened device tree bindings, the rest · Maintainers:
Moritz Fischer, Xu Yilun, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
--- .../bindings/fpga/lattice-ice40-fpga-mgr.txt | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt
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 0000000..cb64184
--- /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: + ice40: ice40@0 { + compatible = "lattice,ice40-fpga-mgr"; + reg = <0>; + spi-max-frequency = <1000000>; + cdone-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>; + creset_b-gpios = <&gpio 22 GPIO_ACTIVE_LOW>; + };
--
2.7.4