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-Altera Passive Serial SPI FPGA Manager
-
-Altera 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: Must be one of the following:
- "altr,fpga-passive-serial",
- "altr,fpga-arria10-passive-serial"
-- reg: SPI chip select of the FPGA
-- nconfig-gpios: config pin (referred to as nCONFIG in the manual)
-- nstat-gpios: status pin (referred to as nSTATUS in the manual)
-
-Optional properties:
-- confd-gpios: confd pin (referred to as CONF_DONE in the manual)
-
-Example:
- fpga: fpga@0 {
- compatible = "altr,fpga-passive-serial";
- spi-max-frequency = <20000000>;
- reg = <0>;
- nconfig-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>;
- nstat-gpios = <&gpio4 11 GPIO_ACTIVE_LOW>;
- confd-gpios = <&gpio4 12 GPIO_ACTIVE_LOW>;
- };