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