93 lines
2.4 KiB
YAML
93 lines
2.4 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/net/qcom,bam-dmux.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm BAM Data Multiplexer
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maintainers:
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- Stephan Gerhold <stephan@gerhold.net>
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description: |
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The BAM Data Multiplexer provides access to the network data channels
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of modems integrated into many older Qualcomm SoCs, e.g. Qualcomm MSM8916
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or MSM8974. It is built using a simple protocol layer on top of a DMA engine
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(Qualcomm BAM DMA) and bidirectional interrupts to coordinate power control.
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Note that this schema does not directly describe a hardware block but rather
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a firmware convention that combines several other hardware blocks (such as the
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DMA engine). As such it is specific to a firmware version, not a particular
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SoC or hardware version.
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properties:
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compatible:
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const: qcom,bam-dmux
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interrupts:
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description:
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Interrupts used by the modem to signal the AP.
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Both interrupts must be declared as IRQ_TYPE_EDGE_BOTH.
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items:
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- description: Power control
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- description: Power control acknowledgment
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interrupt-names:
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items:
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- const: pc
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- const: pc-ack
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qcom,smem-states:
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$ref: /schemas/types.yaml#/definitions/phandle-array
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description: State bits used by the AP to signal the modem.
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items:
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- description: Power control
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- description: Power control acknowledgment
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qcom,smem-state-names:
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description: Names for the state bits used by the AP to signal the modem.
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items:
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- const: pc
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- const: pc-ack
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dmas:
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items:
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- description: TX DMA channel phandle
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- description: RX DMA channel phandle
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dma-names:
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items:
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- const: tx
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- const: rx
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required:
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- compatible
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- interrupts
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- interrupt-names
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- qcom,smem-states
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- qcom,smem-state-names
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- dmas
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- dma-names
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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mpss: remoteproc {
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bam-dmux {
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compatible = "qcom,bam-dmux";
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interrupt-parent = <&modem_smsm>;
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interrupts = <1 IRQ_TYPE_EDGE_BOTH>, <11 IRQ_TYPE_EDGE_BOTH>;
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interrupt-names = "pc", "pc-ack";
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qcom,smem-states = <&apps_smsm 1>, <&apps_smsm 11>;
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qcom,smem-state-names = "pc", "pc-ack";
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dmas = <&bam_dmux_dma 4>, <&bam_dmux_dma 5>;
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dma-names = "tx", "rx";
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};
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};
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