1 # SPDX-License-Identifier: (GPL-2.0-only OR BS
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/dma/intel,l
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: Lightning Mountain centralized DMA cont
8
9 maintainers:
10 - chuanhua.lei@intel.com
11 - mallikarjunax.reddy@intel.com
12
13 allOf:
14 - $ref: dma-controller.yaml#
15
16 properties:
17 compatible:
18 enum:
19 - intel,lgm-cdma
20 - intel,lgm-dma2tx
21 - intel,lgm-dma1rx
22 - intel,lgm-dma1tx
23 - intel,lgm-dma0tx
24 - intel,lgm-dma3
25 - intel,lgm-toe-dma30
26 - intel,lgm-toe-dma31
27
28 reg:
29 maxItems: 1
30
31 "#dma-cells":
32 const: 3
33 description:
34 The first cell is the peripheral's DMA r
35 The second cell is the peripheral's (por
36 The third cell is the burst length of th
37
38 dma-channels:
39 minimum: 1
40 maximum: 16
41
42 dma-channel-mask:
43 maxItems: 1
44
45 clocks:
46 maxItems: 1
47
48 resets:
49 maxItems: 1
50
51 reset-names:
52 items:
53 - const: ctrl
54
55 interrupts:
56 maxItems: 1
57
58 intel,dma-poll-cnt:
59 $ref: /schemas/types.yaml#/definitions/uin
60 description:
61 DMA descriptor polling counter is used t
62 for the descriptor fetching for all chan
63
64 intel,dma-byte-en:
65 type: boolean
66 description:
67 DMA byte enable is only valid for DMA wr
68 Byte enable(1) means DMA write will be b
69 instead of the whole burst.
70
71 intel,dma-drb:
72 type: boolean
73 description:
74 DMA descriptor read back to make sure da
75
76 intel,dma-dburst-wr:
77 type: boolean
78 description:
79 Enable RX dynamic burst write. When it i
80 if it is disabled, the DMA RX will still
81 It only applies to RX DMA and memcopy DM
82
83 required:
84 - compatible
85 - reg
86
87 additionalProperties: false
88
89 examples:
90 - |
91 dma0: dma-controller@e0e00000 {
92 compatible = "intel,lgm-cdma";
93 reg = <0xe0e00000 0x1000>;
94 #dma-cells = <3>;
95 dma-channels = <16>;
96 dma-channel-mask = <0xFFFF>;
97 interrupt-parent = <&ioapic1>;
98 interrupts = <82 1>;
99 resets = <&rcu0 0x30 0>;
100 reset-names = "ctrl";
101 clocks = <&cgu0 80>;
102 intel,dma-poll-cnt = <4>;
103 intel,dma-byte-en;
104 intel,dma-drb;
105 };
106 - |
107 dma3: dma-controller@ec800000 {
108 compatible = "intel,lgm-dma3";
109 reg = <0xec800000 0x1000>;
110 clocks = <&cgu0 71>;
111 resets = <&rcu0 0x10 9>;
112 #dma-cells = <3>;
113 intel,dma-poll-cnt = <16>;
114 intel,dma-byte-en;
115 intel,dma-dburst-wr;
116 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.