On Fri, Oct 28, 2016 at 09:56:39AM -0700, Joshua Clayton wrote: > Describe a cyclonei-ps-spi devicetree entry, required features > > Signed-off-by: Joshua Clayton <stillcompiling@xxxxxxxxx> > --- > .../bindings/fpga/cyclone-ps-spi-fpga-mgr.txt | 23 ++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > create mode 100644 Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt > > diff --git a/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt > new file mode 100644 > index 0000000..c942281 > --- /dev/null > +++ b/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt > @@ -0,0 +1,23 @@ > +Altera Cyclone Passive Serial SPI FPGA Manager > + > +Altera Cyclone FPGAs support a method of loading the bitstream over what is > +referred to as "passive serial". > +The passive serial link is not technically spi, and might require extra > +circuits in order to play nicely with other spi slaves on the same bus. > + > +See https://www.altera.com/literature/hb/cyc/cyc_c51013.pdf > + > +Required properties: > +- compatible : should contain "altr,cyclone-ps-spi-fpga-mgr" > +- reg : spi slave id of the fpga > +- config-gpio : config pin (referred to as nCONFIG in the cyclone manual) > +- status-gpio : status pin (referred to as nSTATUS in the cyclone manual) '-gpios' is the preferred form. Looks like active low to me with nXXXX, but the example says active high. Please be specific here. > + > +Example: > + fpga_spi: evi-fpga-spi@0 { > + compatible = "altr,cyclone-ps-spi-fpga-mgr"; > + spi-max-frequency = <20000000>; > + reg = <0>; > + config-gpio = <&gpio4 9 GPIO_ACTIVE_HIGH>; > + status-gpio = <&gpio4 11 GPIO_ACTIVE_HIGH>; > + }; > -- > 2.7.4 > -- 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
