146 lines
4.2 KiB
YAML
146 lines
4.2 KiB
YAML
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# 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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$id: http://devicetree.org/schemas/soc/qcom/qcom,smp2p.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm Shared Memory Point 2 Point
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maintainers:
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- Andy Gross <agross@kernel.org>
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- Bjorn Andersson <bjorn.andersson@linaro.org>
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- Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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description:
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The Shared Memory Point to Point (SMP2P) protocol facilitates communication
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of a single 32-bit value between two processors. Each value has a single
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writer (the local side) and a single reader (the remote side). Values are
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uniquely identified in the system by the directed edge (local processor ID to
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remote processor ID) and a string identifier.
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properties:
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compatible:
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const: qcom,smp2p
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interrupts:
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maxItems: 1
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mboxes:
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maxItems: 1
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description:
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Reference to the mailbox representing the outgoing doorbell in APCS for
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this client.
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qcom,ipc:
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$ref: /schemas/types.yaml#/definitions/phandle-array
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items:
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- items:
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- description: phandle to a syscon node representing the APCS registers
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- description: u32 representing offset to the register within the syscon
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- description: u32 representing the ipc bit within the register
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description:
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Three entries specifying the outgoing ipc bit used for signaling the
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remote end of the smp2p edge.
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qcom,local-pid:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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The identifier of the local endpoint of this edge.
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qcom,remote-pid:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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The identifier of the remote endpoint of this edge.
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qcom,smem:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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items:
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maxItems: 2
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description:
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Two identifiers of the inbound and outbound smem items used for this edge.
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patternProperties:
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"^master-kernel|slave-kernel|ipa-ap-to-modem|ipa-modem-to-ap|wlan-ap-to-wpss|wlan-wpss-to-ap$":
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type: object
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description:
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Each SMP2P pair contain a set of inbound and outbound entries, these are
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described in subnodes of the smp2p device node. The node names are not
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important.
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properties:
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interrupt-controller:
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description:
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Marks the entry as inbound; the node should be specified as a two
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cell interrupt-controller. If not specified this node will denote
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the outgoing entry.
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'#interrupt-cells':
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const: 2
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qcom,entry-name:
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$ref: /schemas/types.yaml#/definitions/string
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description:
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The name of this entry, for inbound entries this will be used to
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match against the remotely allocated entry and for outbound entries
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this name is used for allocating entries.
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'#qcom,smem-state-cells':
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$ref: /schemas/types.yaml#/definitions/uint32
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const: 1
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description:
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Required for outgoing entries.
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required:
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- qcom,entry-name
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oneOf:
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- required:
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- interrupt-controller
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- '#interrupt-cells'
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- required:
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- '#qcom,smem-state-cells'
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additionalProperties: false
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required:
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- compatible
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- interrupts
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- qcom,local-pid
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- qcom,remote-pid
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- qcom,smem
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oneOf:
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- required:
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- mboxes
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- required:
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- qcom,ipc
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additionalProperties: false
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examples:
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# The following example shows the SMP2P setup with the wireless processor,
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# defined from the 8974 apps processor's point-of-view. It encompasses one
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# inbound and one outbound entry.
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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shared-memory {
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compatible = "qcom,smp2p";
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qcom,smem = <431>, <451>;
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interrupts = <GIC_SPI 143 IRQ_TYPE_EDGE_RISING>;
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qcom,ipc = <&apcs 8 18>;
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qcom,local-pid = <0>;
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qcom,remote-pid = <4>;
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wcnss_smp2p_out: master-kernel {
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qcom,entry-name = "master-kernel";
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#qcom,smem-state-cells = <1>;
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};
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wcnss_smp2p_in: slave-kernel {
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qcom,entry-name = "slave-kernel";
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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};
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