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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/wireless/qcom,ath12k-wsi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies ath12k wireless devices (PCIe) with WSI interface
+
+maintainers:
+ - Jeff Johnson <jjohnson@kernel.org>
+ - Kalle Valo <kvalo@kernel.org>
+
+description:
+ Qualcomm Technologies IEEE 802.11be PCIe devices with WSI interface.
+
+properties:
+ compatible:
+ enum:
+ - pci17cb,1109 # QCN9274
+
+ reg:
+ maxItems: 1
+
+ qcom,ath12k-calibration-variant:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ String to uniquely identify variant of the calibration data for designs
+ with colliding bus and device ids
+
+ qcom,wsi-controller:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ The WSI controller device in the WSI group aids (is capable) to
+ synchronize the Timing Synchronization Function (TSF) clock across
+ all devices in the WSI group.
+
+ ports:
+ $ref: /schemas/graph.yaml#/properties/ports
+ description: |
+ The ath12k devices (QCN9274) feature WSI support. WSI stands for
+ WLAN Serial Interface. It is used for the exchange of specific
+ control information across radios based on the doorbell mechanism.
+ This WSI connection is essential to exchange control information
+ among these devices.
+
+ Diagram to represent one WSI connection (one WSI group) among
+ three devices.
+
+ +-------+ +-------+ +-------+
+ | pcie1 | | pcie2 | | pcie3 |
+ | | | | | |
+ +----->| wsi |------->| wsi |------->| wsi |-----+
+ | | grp 0 | | grp 0 | | grp 0 | |
+ | +-------+ +-------+ +-------+ |
+ +------------------------------------------------------+
+
+ Diagram to represent two WSI connections (two separate WSI groups)
+ among four devices.
+
+ +-------+ +-------+ +-------+ +-------+
+ | pcie0 | | pcie1 | | pcie2 | | pcie3 |
+ | | | | | | | |
+ +-->| wsi |--->| wsi |--+ +-->| wsi |--->| wsi |--+
+ | | grp 0 | | grp 0 | | | | grp 1 | | grp 1 | |
+ | +-------+ +-------+ | | +-------+ +-------+ |
+ +---------------------------+ +---------------------------+
+
+ These ports are used to connect multiple WSI supported devices to
+ form a WSI group.
+
+ properties:
+ port@0:
+ $ref: /schemas/graph.yaml#/properties/port
+ description:
+ This is the TX port of WSI interface. It is attached to the RX
+ port of the next device in the WSI connection.
+
+ port@1:
+ $ref: /schemas/graph.yaml#/properties/port
+ description:
+ This is the RX port of WSI interface. It is attached to the TX
+ port of the previous device in the WSI connection.
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ pcie {
+ #address-cells = <3>;
+ #size-cells = <2>;
+
+ pcie@0 {
+ device_type = "pci";
+ reg = <0x0 0x0 0x0 0x0 0x0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+
+ wifi@0 {
+ compatible = "pci17cb,1109";
+ reg = <0x0 0x0 0x0 0x0 0x0>;
+
+ qcom,ath12k-calibration-variant = "RDP433_1";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ wifi1_wsi_tx: endpoint {
+ remote-endpoint = <&wifi2_wsi_rx>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ wifi1_wsi_rx: endpoint {
+ remote-endpoint = <&wifi3_wsi_tx>;
+ };
+ };
+ };
+ };
+ };
+
+ pcie@1 {
+ device_type = "pci";
+ reg = <0x0 0x0 0x1 0x0 0x0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+
+ wifi@0 {
+ compatible = "pci17cb,1109";
+ reg = <0x0 0x0 0x0 0x0 0x0>;
+
+ qcom,ath12k-calibration-variant = "RDP433_2";
+ qcom,wsi-controller;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ wifi2_wsi_tx: endpoint {
+ remote-endpoint = <&wifi3_wsi_rx>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ wifi2_wsi_rx: endpoint {
+ remote-endpoint = <&wifi1_wsi_tx>;
+ };
+ };
+ };
+ };
+ };
+
+ pcie@2 {
+ device_type = "pci";
+ reg = <0x0 0x0 0x2 0x0 0x0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+
+ wifi@0 {
+ compatible = "pci17cb,1109";
+ reg = <0x0 0x0 0x0 0x0 0x0>;
+
+ qcom,ath12k-calibration-variant = "RDP433_3";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ wifi3_wsi_tx: endpoint {
+ remote-endpoint = <&wifi1_wsi_rx>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ wifi3_wsi_rx: endpoint {
+ remote-endpoint = <&wifi2_wsi_tx>;
+ };
+ };
+ };
+ };
+ };
+ };