81 lines · yaml
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/fpga/xlnx,fpga-slave-serial.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Xilinx Slave Serial SPI FPGA8 9maintainers:10 - Nava kishore Manne <nava.kishore.manne@amd.com>11 12description: |13 Xilinx Spartan-6 and 7 Series FPGAs support a method of loading the bitstream14 over what is referred to as slave serial interface.The slave serial link is15 not technically SPI, and might require extra circuits in order to play nicely16 with other SPI slaves on the same bus.17 18 Datasheets:19 https://www.xilinx.com/support/documentation/user_guides/ug380.pdf20 https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf21 https://www.xilinx.com/support/documentation/application_notes/xapp583-fpga-configuration.pdf22 23allOf:24 - $ref: /schemas/spi/spi-peripheral-props.yaml#25 26properties:27 compatible:28 enum:29 - xlnx,fpga-slave-serial30 31 spi-cpha: true32 33 spi-max-frequency:34 maximum: 6000000035 36 reg:37 maxItems: 138 39 prog_b-gpios:40 description:41 config pin (referred to as PROGRAM_B in the manual)42 maxItems: 143 44 done-gpios:45 description:46 config status pin (referred to as DONE in the manual)47 maxItems: 148 49 init-b-gpios:50 description:51 initialization status and configuration error pin52 (referred to as INIT_B in the manual)53 maxItems: 154 55required:56 - compatible57 - reg58 - prog_b-gpios59 - done-gpios60 - init-b-gpios61 62additionalProperties: false63 64examples:65 - |66 #include <dt-bindings/gpio/gpio.h>67 spi {68 #address-cells = <1>;69 #size-cells = <0>;70 fpga_mgr_spi: fpga-mgr@0 {71 compatible = "xlnx,fpga-slave-serial";72 spi-max-frequency = <60000000>;73 spi-cpha;74 reg = <0>;75 prog_b-gpios = <&gpio0 29 GPIO_ACTIVE_LOW>;76 init-b-gpios = <&gpio0 28 GPIO_ACTIVE_LOW>;77 done-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;78 };79 };80...81