1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/display/sprd/sprd,display-subsystem.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: Unisoc DRM master device 8 9maintainers: 10 - Kevin Tang <kevin.tang@unisoc.com> 11 12description: | 13 The Unisoc DRM master device is a virtual device needed to list all 14 DPU devices or other display interface nodes that comprise the 15 graphics subsystem. 16 17 Unisoc's display pipeline have several components as below description, 18 multi display controllers and corresponding physical interfaces. 19 For different display scenarios, dpu0 and dpu1 maybe binding to different 20 encoder. 21 22 E.g: 23 dpu0 and dpu1 both binding to DSI for dual mipi-dsi display; 24 dpu0 binding to DSI for primary display, and dpu1 binding to DP for external display; 25 26 +-----------------------------------------+ 27 | | 28 | +---------+ | 29 +----+ | +----+ +---------+ |DPHY/CPHY| | +------+ 30 | +----->+dpu0+--->+MIPI|DSI +--->+Combo +----->+Panel0| 31 |AXI | | +----+ +---------+ +---------+ | +------+ 32 | | | ^ | 33 | | | | | 34 | | | +-----------+ | 35 | | | | | 36 |APB | | +--+-+ +-----------+ +---+ | +------+ 37 | +----->+dpu1+--->+DisplayPort+--->+PHY+--------->+Panel1| 38 | | | +----+ +-----------+ +---+ | +------+ 39 +----+ | | 40 +-----------------------------------------+ 41 42properties: 43 compatible: 44 const: sprd,display-subsystem 45 46 ports: 47 $ref: /schemas/types.yaml#/definitions/phandle-array 48 items: 49 maxItems: 1 50 description: 51 Should contain a list of phandles pointing to display interface port 52 of DPU devices. 53 54required: 55 - compatible 56 - ports 57 58additionalProperties: false 59 60examples: 61 - | 62 display-subsystem { 63 compatible = "sprd,display-subsystem"; 64 ports = <&dpu_out>; 65 }; 66