1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2%YAML 1.2 3--- 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 FPGA 8 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 bitstream 14 over what is referred to as slave serial interface.The slave serial link is 15 not technically SPI, and might require extra circuits in order to play nicely 16 with other SPI slaves on the same bus. 17 18 Datasheets: 19 https://www.xilinx.com/support/documentation/user_guides/ug380.pdf 20 https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf 21 https://www.xilinx.com/support/documentation/application_notes/xapp583-fpga-configuration.pdf 22 23allOf: 24 - $ref: /schemas/spi/spi-peripheral-props.yaml# 25 26properties: 27 compatible: 28 enum: 29 - xlnx,fpga-slave-serial 30 31 spi-cpha: true 32 33 spi-max-frequency: 34 maximum: 60000000 35 36 reg: 37 maxItems: 1 38 39 prog_b-gpios: 40 description: 41 config pin (referred to as PROGRAM_B in the manual) 42 maxItems: 1 43 44 done-gpios: 45 description: 46 config status pin (referred to as DONE in the manual) 47 maxItems: 1 48 49 init-b-gpios: 50 description: 51 initialization status and configuration error pin 52 (referred to as INIT_B in the manual) 53 maxItems: 1 54 55required: 56 - compatible 57 - reg 58 - prog_b-gpios 59 - done-gpios 60 - init-b-gpios 61 62additionalProperties: false 63 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