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-Xilinx Slave Serial SPI FPGA Manager
-
-Xilinx Spartan-6 FPGAs support a method of loading the bitstream over
-what is referred to as "slave serial" interface.
-The slave 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.xilinx.com/support/documentation/user_guides/ug380.pdf
-
-Required properties:
-- compatible: should contain "xlnx,fpga-slave-serial"
-- reg: spi chip select of the FPGA
-- prog_b-gpios: config pin (referred to as PROGRAM_B in the manual)
-- done-gpios: config status pin (referred to as DONE in the manual)
-
-Example for full FPGA configuration:
-
- fpga-region0 {
- compatible = "fpga-region";
- fpga-mgr = <&fpga_mgr_spi>;
- #address-cells = <0x1>;
- #size-cells = <0x1>;
- };
-
- spi1: spi@10680 {
- compatible = "marvell,armada-xp-spi", "marvell,orion-spi";
- pinctrl-0 = <&spi0_pins>;
- pinctrl-names = "default";
- #address-cells = <1>;
- #size-cells = <0>;
- cell-index = <1>;
- interrupts = <92>;
- clocks = <&coreclk 0>;
-
- fpga_mgr_spi: fpga-mgr@0 {
- compatible = "xlnx,fpga-slave-serial";
- spi-max-frequency = <60000000>;
- spi-cpha;
- reg = <0>;
- done-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
- prog_b-gpios = <&gpio0 29 GPIO_ACTIVE_LOW>;
- };
- };