Questions tagged [device-tree]
A data structure for describing hardware. passed in boot time to kernel
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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 ...
- 971
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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 {
...
- 101
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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
&...
- 101
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Fail to set a touchscreen in Device Tree
I'm trying to connect a touch controller via I2C to my DART6UL linux embedded board.
The follwoing if what I add to my device tree;
egalax_ts@2a {
compatible = "eeti,egalax_ts";
...
- 101
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Unable to communicate with I2C fuel gauge
I'm trying to communicate with an LTC2959 (datasheet) battery fuel gauge via I2C from my linux-based SBC. I'm not succeeding and I suspect a hardware or device-tree issue.
The IC address is 0xC6 which ...
- 193
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What is the best location to store binary overlays that are applied at runtime?
Binary overlays that are applied while booting would probably best be stored in /boot/overlays or similar. However, what is the best location for binary device-tree overlay files that are intended to ...
- 1
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How do I configure device nodes for simple-pm-bus probe?
Inside a soc node I have a watchdog node with a simple-mdf device.
soc {
#address-cells = <2>;
#size-cells = <2>;
compatible = "simple-bus";
...
- 419
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What are pinctrl states and handles in relation to the device tree?
I have a node with the following
mmc0: mmc@11230000 {
compatible = "mediatek,mt8186-mmc", "mediatek,mt8183-mmc";
pinctrl-names = "default",...
- 419
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Will a platform device with waiting for supplier eventually probe?
I have defined a platform device in the Device tree. The following shows the file tree walk for its folder.
/sys/devices/platform/device
/sys/devices/platform/device/uevent
/sys/devices/platform/...
- 419
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How do we configure musb-hdrc driver?
I would like to use a USB gadget device (phone) as a host via configfs. After setting up configfs, no gadget is being set up on the host peripheral (phone). The init script executes with the following ...
- 419
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dtb phandle Failed to add to the IOMMU
I have this error :
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Loading d0 kernel from boot module @ 0000000018000000
(XEN) Allocating 1:1 mappings totalling 1024MB for dom0:
(XEN) BANK[0] 0x00000020000000-...
- 61
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2
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229
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uboot kernel and dtb calculation
What is the method to calculate these parameters in uboot ? :
bootm_low=0
bootm_size=7ff00000
fdt_addr_r=0x40000000
fdt_high=0x100000
fdt_size_r=0x400000
fdtcontroladdr=7bc971c0
kernel_addr_r=...
- 61
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Can we automatically label device tree with symbols?
Is it possible to use device tree compiler to automatically label nodes when generating device tree source from device tree binary/source?
I can assign the labels from the symbols to their respectful ...
- 419
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unable to boot kernel on A53 (devicetree?)
I am trying to boot a Linux kernel on an A53 cpu (inside a ZU5 from xilinx).
I have two hard. The first is a custom PCB with a ZU5. The second is the ZCU102 SDK with the zu9eg.
Here the boot log :
[ ...
- 61
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tlv320aicx(audio codec) device tree
I'm trying to get solve a kernel message that I'm getting from the tlv320aicx driver. (linux-5.4)
The original error was
Invalid supply voltage(s) AVDD: -22, DVDD: -22
I was able to locate to the ...
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