1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/gpio/aspeed,sgpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Aspeed SGPIO controller
8
9 maintainers:
10 - Andrew Jeffery <andrew@aj.id.au>
11
12 description:
13 This SGPIO controller is for ASPEED AST2400, AST2500 and AST2600 SoC,
14 AST2600 have two sgpio master one with 128 pins another one with 80 pins,
15 AST2500/AST2400 have one sgpio master with 80 pins. Each of the Serial
16 GPIO pins can be programmed to support the following options
17 - Support interrupt option for each input port and various interrupt
18 sensitivity option (level-high, level-low, edge-high, edge-low)
19 - Support reset tolerance option for each output port
20 - Directly connected to APB bus and its shift clock is from APB bus clock
21 divided by a programmable value.
22 - Co-work with external signal-chained TTL components (74LV165/74LV595)
23
24 properties:
25 compatible:
26 enum:
27 - aspeed,ast2400-sgpio
28 - aspeed,ast2500-sgpio
29 - aspeed,ast2600-sgpiom
30
31 reg:
32 maxItems: 1
33
34 gpio-controller: true
35
36 # Each SGPIO is represented as a pair of input and output GPIOs
37 gpio-line-names:
38 minItems: 160
39 maxItems: 256
40
41 '#gpio-cells':
42 const: 2
43
44 interrupts:
45 maxItems: 1
46
47 interrupt-controller: true
48
49 '#interrupt-cells':
50 const: 2
51
52 clocks:
53 maxItems: 1
54
55 ngpios: true
56
57 bus-frequency: true
58
59 required:
60 - compatible
61 - reg
62 - gpio-controller
63 - '#gpio-cells'
64 - interrupts
65 - interrupt-controller
66 - '#interrupt-cells'
67 - ngpios
68 - clocks
69 - bus-frequency
70
71 additionalProperties: false
72
73 examples:
74 - |
75 #include <dt-bindings/clock/aspeed-clock.h>
76 sgpio: sgpio@1e780200 {
77 #gpio-cells = <2>;
78 compatible = "aspeed,ast2500-sgpio";
79 gpio-controller;
80 interrupts = <40>;
81 reg = <0x1e780200 0x0100>;
82 clocks = <&syscon ASPEED_CLK_APB>;
83 interrupt-controller;
84 #interrupt-cells = <2>;
85 ngpios = <80>;
86 bus-frequency = <12000000>;
87 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.