54 lines · yaml
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)2# Copyright 2019 BayLibre, SAS3%YAML 1.24---5$id: http://devicetree.org/schemas/mailbox/amlogic,meson-gxbb-mhu.yaml#6$schema: http://devicetree.org/meta-schemas/core.yaml#7 8title: Amlogic Meson Message-Handling-Unit Controller9 10maintainers:11 - Neil Armstrong <neil.armstrong@linaro.org>12 13description: |14 The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller15 that has 3 independent channels/links to communicate with remote processor(s).16 MHU links are hardwired on a platform. A link raises interrupt for any17 received data. However, there is no specified way of knowing if the sent18 data has been read by the remote. This driver assumes the sender polls19 STAT register and the remote clears it after having read the data.20 21properties:22 compatible:23 enum:24 - amlogic,meson-gxbb-mhu25 26 reg:27 maxItems: 128 29 interrupts:30 minItems: 331 description:32 Contains the interrupt information corresponding to each of the 3 links33 of MHU.34 35 "#mbox-cells":36 const: 137 38required:39 - compatible40 - reg41 - interrupts42 - "#mbox-cells"43 44additionalProperties: false45 46examples:47 - |48 mailbox@c883c404 {49 compatible = "amlogic,meson-gxbb-mhu";50 reg = <0xc883c404 0x4c>;51 interrupts = <208>, <209>, <210>;52 #mbox-cells = <1>;53 };54