qcom,bam-dmux.yaml

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    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 
    7 title: Qualcomm BAM Data Multiplexer
    8 
    9 maintainers:
   10   - Stephan Gerhold <stephan@gerhold.net>
   11 
   12 description: |
   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 
   23 properties:
   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 
   63 required:
   64   - compatible
   65   - interrupts
   66   - interrupt-names
   67   - qcom,smem-states
   68   - qcom,smem-state-names
   69   - dmas
   70   - dma-names
   71 
   72 additionalProperties: false
   73 
   74 examples:
   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     };

Cache object: 3e2148aa373bf50986de863e281de864

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