RK3588 设备树配置mipi

### RK3588 Device Tree Configure MIPI Interface Tutorial For configuring the MIPI interface within the device tree of an RK3588, understanding and modifying specific sections in the device tree source (DTS) files is essential. The DTS file serves as a blueprint that describes hardware components to the operating system. The configuration involves specifying parameters such as clock rates, lane counts, and other properties necessary for initializing and controlling the MIPI interface correctly[^1]. Below are key points on how one might approach this task: #### Editing the Device Tree Source File To edit the device tree source file related to the MIPI interface, locate the section dedicated to the display subsystem or camera interface depending on whether the MIPI CSI (Camera Serial Interface) or DPI (Display Parallel Interface) is being configured. An example snippet illustrating part of what needs modification appears below: ```dts &csi { status = "okay"; csi_mipi_dphy: dphy@fe7e0000 { compatible = "rockchip,rk3588-mipi-dphy"; reg = <0xfe7e0000 0x100>; clocks = <&cru SCLK_CSI_MIPIDPHY_REF>, <&cru PCLK_CSI_DPHY_CFG>; clock-names = "ref", "pclk_cfg"; reset-gpios = <&gpio2 RK_PA6 GPIO_ACTIVE_LOW>; lanes = <4>; /* Number of data lanes */ hs-speed = /bits/ 32 <1500000>; /* High-Speed mode speed per lane */ }; }; ``` This code segment demonstrates setting up a four-lane MIPI D-PHY with specified high-speed transmission speeds suitable for cameras using the CSI protocol. Adjustments should be made according to actual requirements including supported resolutions and frame rates desired by applications running atop Linux kernels compiled against these configurations. #### Compiling Modified Device Trees After editing the appropriate entries inside your `.dts` file(s), compile them into binary format (`*.dtb`) which can then be loaded during boot time either directly from storage media like eMMC/UFS cards attached physically to boards based around Rockchip SoCs or through U-Boot scripts if applicable. Use tools provided alongside kernel sources typically named `dtc` (Device Tree Compiler). Ensure all changes adhere strictly to syntax rules defined under Documentation/devicetree/bindings found within official repositories hosting ARM architecture support patches intended primarily but not exclusively towards Android platforms built upon AOSP trees maintained officially outside China yet widely adopted globally due largely thanks to contributions coming also partly out there too. --related questions-- 1. What are common issues encountered when configuring MIPI interfaces via device trees? 2. How does changing the number of lanes affect performance in MIPI configurations? 3. Can you provide examples where incorrect settings led to malfunctioning devices interfacing over MIPI? 4. Are there any differences between configuring MIPI CSI versus MIPI DSI interfaces in terms of device tree setup?