xref: /linux/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-kcs-bmc.yaml (revision be239684b18e1cdcafcf8c7face4a2f562c745ad) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/ipmi/aspeed,ast2400-kcs-bmc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ASPEED BMC KCS Devices
8
9maintainers:
10  - Andrew Jeffery <andrew@aj.id.au>
11
12description: |
13  The Aspeed BMC SoCs typically use the Keyboard-Controller-Style (KCS)
14  interfaces on the LPC bus for in-band IPMI communication with their host.
15
16properties:
17  compatible:
18    oneOf:
19      - description: Channel ID derived from reg
20        items:
21          enum:
22            - aspeed,ast2400-kcs-bmc-v2
23            - aspeed,ast2500-kcs-bmc-v2
24            - aspeed,ast2600-kcs-bmc
25
26      - description: Old-style with explicit channel ID, no reg
27        deprecated: true
28        items:
29          enum:
30            - aspeed,ast2400-kcs-bmc
31            - aspeed,ast2500-kcs-bmc
32
33  interrupts:
34    maxItems: 1
35
36  reg:
37    # maxItems: 3
38    items:
39      - description: IDR register
40      - description: ODR register
41      - description: STR register
42
43  aspeed,lpc-io-reg:
44    $ref: /schemas/types.yaml#/definitions/uint32-array
45    minItems: 1
46    maxItems: 2
47    description: |
48      The host CPU LPC IO data and status addresses for the device. For most
49      channels the status address is derived from the data address, but the
50      status address may be optionally provided.
51
52  aspeed,lpc-interrupts:
53    $ref: /schemas/types.yaml#/definitions/uint32-array
54    minItems: 2
55    maxItems: 2
56    description: |
57      A 2-cell property expressing the LPC SerIRQ number and the interrupt
58      level/sense encoding (specified in the standard fashion).
59
60      Note that the generated interrupt is issued from the BMC to the host, and
61      thus the target interrupt controller is not captured by the BMC's
62      devicetree.
63
64  kcs_chan:
65    deprecated: true
66    $ref: /schemas/types.yaml#/definitions/uint32
67    description: The LPC channel number in the controller
68
69  kcs_addr:
70    deprecated: true
71    $ref: /schemas/types.yaml#/definitions/uint32
72    description: The host CPU IO map address
73
74required:
75  - compatible
76  - interrupts
77
78additionalProperties: false
79
80allOf:
81  - if:
82      properties:
83        compatible:
84          contains:
85            enum:
86              - aspeed,ast2400-kcs-bmc
87              - aspeed,ast2500-kcs-bmc
88    then:
89      required:
90        - kcs_chan
91        - kcs_addr
92    else:
93      required:
94        - reg
95        - aspeed,lpc-io-reg
96
97examples:
98  - |
99    #include <dt-bindings/interrupt-controller/irq.h>
100    kcs3: kcs@24 {
101        compatible = "aspeed,ast2600-kcs-bmc";
102        reg = <0x24 0x1>, <0x30 0x1>, <0x3c 0x1>;
103        aspeed,lpc-io-reg = <0xca2>;
104        aspeed,lpc-interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
105        interrupts = <8>;
106    };
107