xref: /linux/Documentation/devicetree/bindings/net/qcom,bam-dmux.yaml (revision 24bce201d79807b668bf9d9e0aca801c5c0d5f78) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/net/qcom,bam-dmux.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Qualcomm BAM Data Multiplexer
8
9maintainers:
10  - Stephan Gerhold <stephan@gerhold.net>
11
12description: |
13  The BAM Data Multiplexer provides access to the network data channels
14  of modems integrated into many older Qualcomm SoCs, e.g. Qualcomm MSM8916
15  or MSM8974. It is built using a simple protocol layer on top of a DMA engine
16  (Qualcomm BAM DMA) and bidirectional interrupts to coordinate power control.
17
18  Note that this schema does not directly describe a hardware block but rather
19  a firmware convention that combines several other hardware blocks (such as the
20  DMA engine). As such it is specific to a firmware version, not a particular
21  SoC or hardware version.
22
23properties:
24  compatible:
25    const: qcom,bam-dmux
26
27  interrupts:
28    description:
29      Interrupts used by the modem to signal the AP.
30      Both interrupts must be declared as IRQ_TYPE_EDGE_BOTH.
31    items:
32      - description: Power control
33      - description: Power control acknowledgment
34
35  interrupt-names:
36    items:
37      - const: pc
38      - const: pc-ack
39
40  qcom,smem-states:
41    $ref: /schemas/types.yaml#/definitions/phandle-array
42    description: State bits used by the AP to signal the modem.
43    items:
44      - description: Power control
45      - description: Power control acknowledgment
46
47  qcom,smem-state-names:
48    description: Names for the state bits used by the AP to signal the modem.
49    items:
50      - const: pc
51      - const: pc-ack
52
53  dmas:
54    items:
55      - description: TX DMA channel phandle
56      - description: RX DMA channel phandle
57
58  dma-names:
59    items:
60      - const: tx
61      - const: rx
62
63required:
64  - compatible
65  - interrupts
66  - interrupt-names
67  - qcom,smem-states
68  - qcom,smem-state-names
69  - dmas
70  - dma-names
71
72additionalProperties: false
73
74examples:
75  - |
76    #include <dt-bindings/interrupt-controller/irq.h>
77
78    mpss: remoteproc {
79        bam-dmux {
80            compatible = "qcom,bam-dmux";
81
82            interrupt-parent = <&modem_smsm>;
83            interrupts = <1 IRQ_TYPE_EDGE_BOTH>, <11 IRQ_TYPE_EDGE_BOTH>;
84            interrupt-names = "pc", "pc-ack";
85
86            qcom,smem-states = <&apps_smsm 1>, <&apps_smsm 11>;
87            qcom,smem-state-names = "pc", "pc-ack";
88
89            dmas = <&bam_dmux_dma 4>, <&bam_dmux_dma 5>;
90            dma-names = "tx", "rx";
91        };
92    };
93