Questions tagged [device-tree]
A data structure for describing hardware. passed in boot time to kernel
147 questions
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DTS parameters for USB3 in Xilinx ZynqMP
When setting USB3 in device tree, I've seen in dts of reference boards (for example DTS for zcu102-RevA) different parameters for setting PHY. there are two parameters in dts for USB: phys = <&...
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Adding MCP23017 to device-tree and accessing ICs connected to expander
I try access multiple ICs via I2C over the MCP23017 I/O Expander for a custom embedded board. I know ICs I2C adresses. How should I add the MCP23017 to the device-tree? I think I need to add the ICs ...
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Failed to use pinctrl/pinmux in port multiplexing
I am working on an embedded Linux system (kernel-5.10.24), and now I want to setup a UART port (with RXD/TXD/RTS/CTS) from 2 GPIO groups. The DTS is setting as follows, &pinctrl { uart0_pin: ...
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How to define GPIO pin as PPS source device
I'm using Linux in an embedded environment. I want to use a particular GPIO pin as a PPS source to be used with gpsd. I think the pin is configured correctly because I can see high/low transitions ...
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Are onboard hubs detected as USB root hubs or external devices?
I have connected an onboard hub to my microprocessor. The onboard hub is USB2514B and the microprocessor is a STM32MP1. I can specify the the connection to the onboard hub by using OHCI (Open Host ...
- 219
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device-tree entry for an i2c to spi multiplexer that shares logic with a GPIO multiplexer
I have the following setup (from external; this cannot be changed): +------+ I2C | I2C |--------------------- Device 0 --------| to |------------ Device 1 | MISO0 | SPI |--- ...
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39views
I2S clock provider mode not supported - How to enable?
Introduktion: I having a HDMI PHY SII9022A. I want to enable audio on that PHY. Requriments: I need to create a proper device tree for the SII9022A. https://www.kernel.org/doc/Documentation/devicetree/...
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Chaining I2S with alsa
For one of the projects that I’m following for my job I’m supposed to define the device tree of a custom embedded board. The problem is that the audio stream for the board is structured as follows: ...
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How can pass to rmii from mii in ethernet chip?
I use ksz8081mnx mii ethernet chip.I made my ethernet configuration and it is succesful. I changed my ethernet chip with ksz8081rnb rmii.I organised dts file but my ethernet not working. sama5d2.dtsi ...
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Kernel panic - not syncing: Unable to initialise architected timer : unable to boot Android 14 with qemu-system-aarch64 on Ubuntu 24.04 X64 bit
I want to emulate Android 14 by KonstaKang using qemu-system-aarch64 with the virt model on Ubuntu 24.04 x64-bit, installed on my PC (Intel i9 + RTX 2080 Ti). I’ve chosen the boot parameters according ...
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Dummy sound codec devicetree node for Linux
I have an rk3588-based SBC. I need to output audio via I2S (specifically its I2S1 output). However, there is no "codec" device which Linux knows about; the system which receives the I2S ...
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Linux cannot "find" DTB provided by QEMU
I'm trying to use QEMU 9 to emulate a Versatile AB development board and boot Linux. I've grabbed vmlinuz and initrd.gz from the Debian Jessie netboot installer and the devicetree from contemporary ...
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How to work around the lack of device tree on amd64 arch?
I have a mainboard with several I2C, SPI and I2S devices. It's a mainboard with a CPU/RAM daughterboard. I'm currently using arm64 CPUs (iMX8M). I let the kernel drivers know about the I2C addresses ...
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Define GPIO name/status in Device Tree and have it accessible from userspace
I have a custom board with several GPIO. I'd like to: give them a friendly name be able to get the level at boot time define active high/low I defined the GPIO as hogs like this &gpio5 { ...
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Multiple I2C GPIO Expander give probing error due to shared reset pin
I'm editing the kernel device tree for a custom board. I have two GPIO expanders (pcal6416) connected to i2c3 bus. The two expanders share the same CPU pin as reset. Here is the initial device tree &...
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