1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/fpga/lattice,sysconfig.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Lattice Slave SPI sysCONFIG FPGA manager
8
9 maintainers:
10 - Vladimir Georgiev <v.georgiev@metrotek.ru>
11
12 description: |
13 Lattice sysCONFIG port, which is used for FPGA configuration, among others,
14 have Slave Serial Peripheral Interface. Only full reconfiguration is
15 supported.
16
17 Programming of ECP5 is done by writing uncompressed bitstream image in .bit
18 format into FPGA's SRAM configuration memory.
19
20 properties:
21 compatible:
22 enum:
23 - lattice,sysconfig-ecp5
24
25 reg:
26 maxItems: 1
27
28 program-gpios:
29 description:
30 A GPIO line connected to PROGRAMN (active low) pin of the device.
31 Initiates configuration sequence.
32 maxItems: 1
33
34 init-gpios:
35 description:
36 A GPIO line connected to INITN (active low) pin of the device.
37 Indicates that the FPGA is ready to be configured.
38 maxItems: 1
39
40 done-gpios:
41 description:
42 A GPIO line connected to DONE (active high) pin of the device.
43 Indicates that the configuration sequence is complete.
44 maxItems: 1
45
46 required:
47 - compatible
48 - reg
49
50 allOf:
51 - $ref: /schemas/spi/spi-peripheral-props.yaml
52
53 - if:
54 properties:
55 compatible:
56 contains:
57 const: lattice,sysconfig-ecp5
58 then:
59 properties:
60 spi-max-frequency:
61 maximum: 60000000
62
63 unevaluatedProperties: false
64
65 examples:
66 - |
67 #include <dt-bindings/gpio/gpio.h>
68
69 spi {
70 #address-cells = <1>;
71 #size-cells = <0>;
72
73 fpga-mgr@0 {
74 compatible = "lattice,sysconfig-ecp5";
75 reg = <0>;
76 spi-max-frequency = <20000000>;
77 program-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
78 init-gpios = <&gpio3 3 GPIO_ACTIVE_LOW>;
79 done-gpios = <&gpio3 2 GPIO_ACTIVE_HIGH>;
80 };
81 };
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